How House Works

York, Coleman and Luxaire furnace codes (LED flash codes)

54 codes for 43 model series, each with the wording and source from Johnson Controls installation manuals, wiring-diagram labels and quick reference guides.

How House Works EditorialChecked against 42 sources,
How it is checked
Methodology
Page
HHW · ERROR-CODES · YORK
Based on
Johnson Controls installation manuals, wiring-diagram labels and quick reference guides

Meanings are quoted from Johnson Controls installation manuals, wiring-diagram labels and quick reference guides. The "Who" column is our reading of the remedy in those documents: whether an owner can do the first checks, or the fix belongs to a licensed technician.

Codes with step-by-step checks

How it works: How a gas furnace lights, and how the control board blinks a failure code

All York, Coleman and Luxaire codes

CodeMeaningWhoSeriesSource
1 red flash“Flame present with gas off”
What to check		Technician
29 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C
16 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32
1 red flash“FLAME PRESENT WITH GV OFF”
What to check		Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
1 red flash“Indicates that flame was sensed when there was not a call for heat. The control turns on both the inducer motor and supply air blower.”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 87
2 red flashes“Check pressure switch wiring”
What to check		Technician
26 seriesTM8X, TMLX, TM9T, TG9S, GG9S, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C
13 documents998492-UIM-C-1013 p. 26; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32
2 red flashes“PS CLOSED WITH IDM OFF”
What to check		Technician
5 seriesRG19, RL18, Y81E, Y91E, Y92E
5 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82
2 red flashes“Pressure switch stuck closed”
What to check		TechnicianTM9E, TM9X, RGF19*E6019630-UIM-F-0423 p. 36; 1083288-UIM-A-0114 p. 38; 6019627-UIM-F-0423 p. 36
2 red flashes“PRESSURE SWITCH CLOSED WITH IDM OFF”
What to check		TechnicianY82E, Y92V6142403-UIM-C-1124 p. 63; 6553957-UIM-A-0626 p. 96
2 red flashes“Indicates that the pressure switch is closed when it should be open. The unit control board confirms that the pressure switch contacts are open at the beginning of each heat cycle and does not let the ignition sequence continue if the pressure switch contacts are closed when they should be open.”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 88
3 red flashes“Vent OR termination problem”
What to check		Technician
17 seriesTM8X, TMLX, TM9V, DGAX, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C
8 documents998492-UIM-C-1013 p. 26; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32
3 red flashes“Vent, intake, OR termination problem”
What to check		Technician
12 seriesTM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, RGF19*E, TM9Y
8 documents6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37
3 red flashes“PS OPEN WITH IDM ON”
What to check		Technician
5 seriesRG19, RL18, Y81E, Y91E, Y92E
5 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82
3 red flashes“PS1 OPEN WITH IDM ON”
What to check		TechnicianY82E6142403-UIM-C-1124 p. 63
3 red flashes“PS1 OPEN WITH LOW SPEED IDM ON”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 96
3 red flashes“Indicates that the pressure switch contacts are open when they should be closed”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 88
4 red flashes“Airflow problem OR open fuse”
What to check		Technician
25 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9V, DGAX, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C
12 documents998492-UIM-C-1013 p. 26; 1083163-UIM-A-0214 p. 38; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 1034867-UIM-B-0913 p. 31; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32
4 red flashes“Airflow problem”
What to check		Technician
11 seriesTM9E, TP9C, YP9C, CP9C, LP9C, TM9M, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C
7 documents6019630-UIM-F-0423 p. 36; 1083292-UIM-A-0114 p. 43; 1083293-UIM-A-0114 p. 41; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30
4 red flashes“LS / ROS SWITCH OPEN”
What to check		Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
4 red flashes“Indicates that the main limit switch has opened its normally closed contacts. The unit control board turns on the supply air blower and inducer.”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 88
5 red flashes“Flame Rollout OR open fuse”
What to check		Technician
21 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP
11 documents998492-UIM-C-1013 p. 26; 1083163-UIM-A-0214 p. 38; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 1083292-UIM-A-0114 p. 43; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 1034867-UIM-B-0913 p. 31; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29
5 red flashes“Flame Rollout”
What to check		Technician
14 seriesTM9E, TP9C, YP9C, CP9C, LP9C, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TPLC*C, YPLC*C, CPLC*C, LPLC*C
7 documents6019630-UIM-F-0423 p. 36; 5750151-UIM-G-0423 p. 39; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 987158-UIM-B-1013 p. 32
5 red flashes“LS / ROS OPEN GREATER THAN 15 MIN.”
What to check		Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
5 red flashes“Indicates that the normally closed rollout switch is open or the limit switch has been open longer than 15 min”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 89
5 red flashes“Auxiliary limit OR open fuse”
What to check		TechnicianDGAX5483101-UIM-A-1118 p. 29
6 red flashes“Repeated 3 Red”
What to check		Technician
20 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TM9V, DGAX, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP
13 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29
6 red flashes“Check gas valve wiring”
What to check		Technician
9 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TPLC*C, YPLC*C, CPLC*C, LPLC*C
5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 987158-UIM-B-1013 p. 32
6 red flashes“PS CYCLE LOCKOUT”
What to check		Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
6 red flashes“Indicates that while the unit was operating, the pressure switch opened four times during the call for heat”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 89
7 red flashes“Failed to light burners”
What to check		Technician
29 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C
16 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32
7 red flashes“LOCKOUT DUE TO FAILED IGNITION”
What to check		Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
7 red flashes“Indicates that the flame could not be established during three trials for ignition”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 89
8 red flashes“Loss of flame during call for heat”
What to check		Technician
29 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C
16 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32
8 red flashes“LOCKOUT DUE TO FLAME DROPOUTS”
What to check		Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
8 red flashes“Indicates that the flame has been lost five times (four recycles) during the heating cycle”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 89
9 red flashes“Hot/Neutral reversed OR poor ground/neutral”Technician
20 seriesTM8X, TMLX, TM9E, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TPLC*C, YPLC*C, CPLC*C, LPLC*C
12 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 987158-UIM-B-1013 p. 32
9 red flashes“Hot/Neutral reversed OR poor ground/neutral OR Twinning error”Technician
9 seriesTM9T, TG9S, GG9S, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP
1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29
9 red flashes“INCORRECT LINE POLARITY/TWINNING FAULT”TechnicianRG19, RL18, Y81E, Y91E6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6125049-UIM-C-0624 p. 52
9 red flashes“INCORRECT LINE POLARITY”TechnicianY82E, Y92E6142403-UIM-C-1124 p. 63; 6154201-UIM-B-1224 p. 82
9 red flashes“INCORRECT LINE VOLTAGE POLARITY”TechnicianY92V6553957-UIM-A-0626 p. 96
9 red flashes“Indicates reversed line voltage polarity, grounding problem, or reversed low voltage transformer wires. Both heating and cooling operations are affected.”TechnicianY92V6553957-UIM-A-0626 p. 89
10 red flashes“Gas valve shorted "ON"”Technician
29 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C
16 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32
10 red flashes“GV FAULT”Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
10 red flashes“Gas valve energized with no call for heat. The main blower and inducer blower run and no ignition sequence is started as long as this condition exists.”TechnicianY92V6553957-UIM-A-0626 p. 90
11 red flashes“Check blower motor/wiring”
What to check		Technician
29 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C
16 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32
11 red flashes“LS/ROS OPEN FROM 5 TO 15 MIN.”
What to check		Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
11 red flashes“Indicates that the main limit switch has opened its normally-closed contacts and has remained open for more than 5 min. This condition is usually caused by a failed blower motor or blower wheel. The unit control board enters a hard lockout and power has to be cycled off and on to reset the unit control board after the problem is corrected.”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 90
12 red flashes“ID plug missing OR not connected properly”Technician
9 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TPLC*C, YPLC*C, CPLC*C, LPLC*C
5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 987158-UIM-B-1013 p. 32
12 red flashes“This indicates a loose or missing model ID plug.”TechnicianTM9V*C5750149-UIM-I-0423 p. 38
12 red flashes“MODEL ID CONFIGURATION ERROR”TechnicianY92V6553957-UIM-A-0626 p. 96
12 red flashes“Model ID configuration error. This is unlikely to happen but could occur due to an incorrect blower selection.”TechnicianY92V6553957-UIM-A-0626 p. 90
13 red flashes“Vent OR termination problem”Technician
6 seriesTM9V, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP
1083294-UIM-A-0114 p. 44; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28
13 red flashes“Vent, intake, OR termination problem”TechnicianTM9T, TM9Y1083286-UIM-A-0114 p. 39; 5750144-UIM-H-0423 p. 37
13 red flashes“PS2 OPEN WITH IDM ON”TechnicianY82E, Y92E6142403-UIM-C-1124 p. 63; 6154201-UIM-B-1224 p. 82
13 red flashes“PS2 OPEN WITH HIGH SPEED IDM ON”TechnicianY92V6553957-UIM-A-0626 p. 96
13 red flashes“Indicates that the second-stage (high) pressure switch is open with a call for second-stage heating (high fire) present”TechnicianY92V6553957-UIM-A-0626 p. 90
14 red flashes“LOW VOLTAGE < 19.2VAC - PREVENTS FURTHER RELAY OUTPUTS FOR > 2 SECONDS”Technician
6 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E
6 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82
15 red flashes“LOW VOLTAGE < 16 VAC - STOPS CURRENT RELAY OUTPUTS FOR > 2 SECONDS”Technician
6 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E
6 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82
17 red flashes“LOW VOLTAGE < 19.2VAC - PREVENTS FURTHER RELAY OUTPUTS FOR > 2 SECONDS”TechnicianY92V6553957-UIM-A-0626 p. 96
17 red flashes“If the secondary voltage drops below approximately 19 VAC, the unit control board continues to energize any relays that are already energized, but does not energize any additional relays until the voltage level increases.”TechnicianY92V6553957-UIM-A-0626 p. 90
18 red flashes“LOW VOLTAGE < 16 VAC - STOPS CURRENT RELAY OUTPUTS FOR > 2 SECONDS”TechnicianY92V6553957-UIM-A-0626 p. 96
18 red flashes“If the secondary voltage drops below approximately 16 VAC, the unit control board immediately de-energizes the relay outputs and does not energize any relays until the voltage level increases above approximately 20 VAC.”TechnicianY92V6553957-UIM-A-0626 p. 90
1 amber flash“Normal operation with call for cooling.”Technician
9 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TPLC*C, YPLC*C, CPLC*C, LPLC*C
5750151-UIM-G-0423 p. 36; 1083293-UIM-A-0114 p. 39; 987158-UIM-B-1013 p. 32
2 amber flashes“Normal Operation with call for heat”Technician
15 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TM9V, TPLC*C, YPLC*C, CPLC*C, LPLC*C, (T,Y,C,L)P9C, TM(8,L)T, TM(8,L)V, (T,G)G(8,L)S, (T,Y,C,L)PLC
9 documents5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083301-URG-A-0114 p. 1; 987158-UIM-B-1013 p. 32; 1083298-URG-A-0114 p. 1; 521574-URG-B-0413 p. 1; 523354-URG-C-0513 p. 1; 530287-URG-B-0413 p. 1; 535679-URG-B-0413 p. 1
3 amber flashes“Normal Operation, burner on at end of heat cycle”Technician
9 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TPLC*C, YPLC*C, CPLC*C, LPLC*C
5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 987158-UIM-B-1013 p. 32
3 amber flashes“Normal operation, burner is on at end of thermostat cycle.”Technician(T,Y,C,L)P9C, (T,G)G(8,L)S, (T,Y,C,L)PLC1083298-URG-A-0114 p. 1; 530287-URG-B-0413 p. 1; 535679-URG-B-0413 p. 1
4 amber flashes“No G from thermostat”
What to check		Technician
18 seriesTM8X, TMLX, TM9E, TG9S, GG9S, TM9X, TM9V, DGAX, RGF19*E, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP
11 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29
4 amber flashes“Reduced Airflow problem”
What to check		Technician
9 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TPLC*C, YPLC*C, CPLC*C, LPLC*C
5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 987158-UIM-B-1013 p. 32
4 amber flashes“"Y" T-STAT CALL WITHOUT "G" CALL”
What to check		Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
4 amber flashes“Y signal with no G from thermostat”
What to check		TechnicianTM9T, TM9Y1083286-UIM-A-0114 p. 39; 5750144-UIM-H-0423 p. 37
4 amber flashes“The unit control board is receiving a Y signal from the thermostat without a G signal. The unit operates normally in both heating and cooling, but this status code is displayed to alert the user that there is a wiring problem.”
What to check		TechnicianY92V6553957-UIM-A-0626 p. 91
4 amber flashes“Control is receiving a "Y" signal from thermostat without a "G" signal.”
What to check		TechnicianTM(8,L)X1060926-URG-A-1013 p. 1
5 amber flashes“High altitude installation OR vent, intake OR termination problem”Technician
5 seriesTP9C, YP9C, CP9C, LP9C, TM9M
5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41
5 amber flashes“High altitude installation OR vent, OR termination problem”TechnicianTPLC*C, YPLC*C, CPLC*C, LPLC*C987158-UIM-B-1013 p. 32
6 amber flashes“Normal Operation with call for heat pump heating”Technician
12 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TPLC*C, YPLC*C, CPLC*C, LPLC*C, (T,Y,C,L)P9C, (T,G)G(8,L)S, (T,Y,C,L)PLC
6 documents5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 987158-UIM-B-1013 p. 32; 1083298-URG-A-0114 p. 1; 530287-URG-B-0413 p. 1; 535679-URG-B-0413 p. 1
7 amber flashes“Normal operation, air conditioning, compressor is on in low cooling after wall thermostat has been satisfied.”TechnicianTPLC*C, YPLC*C, CPLC*C, LPLC*C987158-UIM-B-1013 p. 30
1 green flash“Normal Operation with no call for heat.”Technician
9 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TPLC*C, YPLC*C, CPLC*C, LPLC*C
5750151-UIM-G-0423 p. 36; 1083293-UIM-A-0114 p. 39; 987158-UIM-B-1013 p. 30
2 green flashes“Indicator for "No error codes in memory". See Diagnostic Fault Code Storage and Retrieval section below.”Technician
9 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TPLC*C, YPLC*C, CPLC*C, LPLC*C
5750151-UIM-G-0423 p. 36; 1083293-UIM-A-0114 p. 39; 987158-UIM-B-1013 p. 30
3 green flashes“Indicator for "Error codes cleared from memory". See Diagnostic Fault Code Storage and Retrieval section below.”Technician
9 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TPLC*C, YPLC*C, CPLC*C, LPLC*C
5750151-UIM-G-0423 p. 36; 1083293-UIM-A-0114 p. 39; 987158-UIM-B-1013 p. 30
1 slow green“Normal Operation”Owner can checkTPLC*C, YPLC*C, CPLC*C, LPLC*C987158-UIM-B-1013 p. 32
Alternating red and amber flash“REFRIGERANT LEAK DETECTED NEAR FURNACE”Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
Alternating red and amber flash“Indicates that a refrigerant leak has been detected near the unit”TechnicianY92V6553957-UIM-A-0626 p. 87
Alternating red and amber flashes“This indicates that a refrigerant leak has been detected near the furnace.”TechnicianY82E6142403-UIM-C-1124 p. 58
Amber heartbeat“NORMAL OPERATION WITH CALL FOR HEAT”Owner can check
6 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E
6 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82
Amber heartbeat“NORM. OPERATION W/CALL FOR LOW GAS HEAT”TechnicianY92V6553957-UIM-A-0626 p. 96
Amber heartbeat“NORM. OPERATION W/CALL FOR HIGH GAS HEAT”TechnicianY92V6553957-UIM-A-0626 p. 96
Amber heartbeat“NORM. OPERATION W/CALL FOR HP HEAT”TechnicianY92V6553957-UIM-A-0626 p. 96
Amber heartbeat“NORM. OPERATION W/CALL FOR COOLING”Owner can checkY92V6553957-UIM-A-0626 p. 96
Any rapid 4 flash“Potential fault codes / conditions.”Technician(T,G)G9S1083295-URG-A-0114 p. 1
Any rapid 4 flashes“Potential fault codes / conditions.”TechnicianTM9T1083297-URG-A-0114 p. 1
Any rapid flash“Potential fault codes / conditions.”TechnicianTM9E, TM9X1104909-URG-A-0214 p. 1; 1083300-URG-A-0114 p. 1
Any red flash“Fault condition.”Technician
10 seriesTM9E, TM9T, TM9X, TM9V, TM(8,L)X, (T,G)G9S, (T,Y,C,L)P9C, TM(8,L)V, (T,G)G(8,L)S, (T,Y,C,L)PLC
10 documents1104909-URG-A-0214 p. 1; 1083297-URG-A-0114 p. 1; 1083300-URG-A-0114 p. 1; 1083301-URG-A-0114 p. 1; 1060926-URG-A-1013 p. 1; 1083295-URG-A-0114 p. 1; 1083298-URG-A-0114 p. 1; 523354-URG-C-0513 p. 1; 530287-URG-B-0413 p. 1; 535679-URG-B-0413 p. 1
Any red flash“Fault Conditon.”TechnicianTM(8,L)T521574-URG-B-0413 p. 1
CC“Call for cooling”Owner can checkY92V6553957-UIM-A-0626 p. 87
Continuous amber flash“Flame sense current is below 1.5 microamps.”Technician
12 seriesTM9T, TG9S, GG9S, TM9V, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP
6 documents1083286-UIM-A-0114 p. 37; 1083287-UIM-A-0114 p. 38; 1083294-UIM-A-0114 p. 41; 5750148-UIM-D-0423 p. 26; 995472-UIM-B-0713 p. 26; 998491-UIM-B-1013 p. 27
Continuous amber flash“Flame sense current is below 0.35 micro amps.”TechnicianTM9Y, Y82E, Y92V5750144-UIM-H-0423 p. 35; 6142403-UIM-C-1124 p. 58; 6553957-UIM-A-0626 p. 87
Continuous amber flash“The flame sense current is below 0.35 µA. Check and clean the flame sensor.”TechnicianRG19, Y91E, Y92E6125051-UIM-C-0624 p. 49; 6125049-UIM-C-0624 p. 49; 6154201-UIM-B-1224 p. 77
Continuous amber flash“Flame sense current is below 1.5 µA. Check and clean flame sensor.”TechnicianTM9V*C5750149-UIM-I-0423 p. 37
Continuous green flash“Twinning error, incorrect 24V phasing or no power to twinned unit.”Technician
6 seriesTG9S, GG9S, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP
1083287-UIM-A-0114 p. 38; 998491-UIM-B-1013 p. 27
Continuous red flash“Twinning error, incorrect 24V phasing or no power to twinned unit.”TechnicianTM9T, TM8T*MP, TMLT*MP1083286-UIM-A-0114 p. 37; 995472-UIM-B-0713 p. 26
Green heartbeat“NORMAL OPERATION”Owner can check
6 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E
6 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82
Green heartbeat“NORMAL OPERATION STANDBY”Owner can checkY92V6553957-UIM-A-0626 p. 96
H1“Call for first-stage heat”TechnicianY92V6553957-UIM-A-0626 p. 87
H2“Call for second-stage heat”TechnicianY92V6553957-UIM-A-0626 p. 87
HP“Call for heat pump operation”Owner can checkY92V6553957-UIM-A-0626 p. 87
LED off“Power Off or blown fuse”Technician
16 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, DGAX, RGF19*E, TM9Y, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP
10 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29
LED off“Power Off”Technician
14 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TM9V, Y92V, TM9V*C, TM8V*C, TMLV*C, TPLC*C, YPLC*C, CPLC*C, LPLC*C
7 documents5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 6553957-UIM-A-0626 p. 96; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 987158-UIM-B-1013 p. 32
LED off“POWER OFF OR OPEN FUSE”Technician
6 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E
6 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82
LED off“Indicates an issue with power to the unit control board or possible unit control board failure.”TechnicianY92V6553957-UIM-A-0626 p. 87
Rapid amber flash“Low flame sense current”Technician
30 seriesTM9T, TG9S, GG9S, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, RG19, RL18, TM9Y, Y81E, Y82E, Y91E, Y92E, Y92V, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C
18 documents1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 5750144-UIM-H-0423 p. 37; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32
Rapid green flash“CONTROL IN FACTORY TEST MODE”Technician
7 seriesRG19, RL18, Y81E, Y82E, Y91E, Y92E, Y92V
7 documents6125051-UIM-C-0624 p. 52; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 6553957-UIM-A-0626 p. 96
Rapid green flash“Factory speedup mode”Technician
5 seriesTP9C, YP9C, CP9C, LP9C, TM9M
5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41
Rapid green flash“Control is in "Factory Speed-up" mode.”TechnicianTPLC*C, YPLC*C, CPLC*C, LPLC*C987158-UIM-B-1013 p. 30
Rapid green flash“Indicates unit control board is in the factory test mode”TechnicianY92V6553957-UIM-A-0626 p. 87
Rapid red flash“Twinning error OR reversed 24V leads”TechnicianTG9S, GG9S1083287-UIM-A-0114 p. 40
Rapid red flash“FUSE OPEN”TechnicianY92V6553957-UIM-A-0626 p. 96
Rapid red flashes“Indicates that the fuse on the unit control board has opened”TechnicianY92V6553957-UIM-A-0626 p. 91
Slow amber flash“Normal Operation with call for heat”Owner can check
29 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TM9V, DGAX, RG19, RGF19*E, RL18, TM9Y, Y81E, Y82E, Y91E, Y92E, Y92V, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TM(8,L)X, (T,G)G9S
22 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083297-URG-A-0114 p. 1; 1083287-UIM-A-0114 p. 40; 1083300-URG-A-0114 p. 1; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6125051-UIM-C-0624 p. 49; 6019627-UIM-F-0423 p. 36; 6100760-UIM-C-1124 p. 57; 5750144-UIM-H-0423 p. 37; 6100757-UIM-C-1124 p. 57; 6142403-UIM-C-1124 p. 58; 6125049-UIM-C-0624 p. 49; 6154201-UIM-B-1224 p. 77; 6553957-UIM-A-0626 p. 86; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 1060926-URG-A-1013 p. 1; 1083295-URG-A-0114 p. 1
Slow amber flash“Normal Operation with call for cooling”Owner can check
10 seriesTP9C, YP9C, CP9C, LP9C, TM9M, TM9V, (T,Y,C,L)P9C, TM(8,L)V, (T,G)G(8,L)S, (T,Y,C,L)PLC
7 documents5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083301-URG-A-0114 p. 1; 1083298-URG-A-0114 p. 1; 523354-URG-C-0513 p. 1; 530287-URG-B-0413 p. 1; 535679-URG-B-0413 p. 1
Slow amber flash“Normal operation with call for cool.”Owner can checkTM(8,L)T521574-URG-B-0413 p. 1
Slow green flash“Normal Operation”Owner can check
26 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, (T,G)G9S
16 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083297-URG-A-0114 p. 1; 1083287-UIM-A-0114 p. 40; 1083300-URG-A-0114 p. 1; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 1083295-URG-A-0114 p. 1
Slow green flash“Normal operation in standby mode.”Owner can check
7 seriesTM9V, TM(8,L)X, (T,Y,C,L)P9C, TM(8,L)T, TM(8,L)V, (T,G)G(8,L)S, (T,Y,C,L)PLC
7 documents1083301-URG-A-0114 p. 1; 1060926-URG-A-1013 p. 1; 1083298-URG-A-0114 p. 1; 521574-URG-B-0413 p. 1; 523354-URG-C-0513 p. 1; 530287-URG-B-0413 p. 1; 535679-URG-B-0413 p. 1
Slow green flash“Normal operation, no thermostat calls.”Owner can checkRL18, Y81E, Y82E, Y92V6100760-UIM-C-1124 p. 57; 6100757-UIM-C-1124 p. 57; 6142403-UIM-C-1124 p. 58; 6553957-UIM-A-0626 p. 86
Slow green flash“Standby, normal operation, fan only, and call for cooling.”Owner can checkRG19, Y91E, Y92E6125051-UIM-C-0624 p. 49; 6125049-UIM-C-0624 p. 49; 6154201-UIM-B-1224 p. 77
Solid (any color)“CONTROL FAILURE”TechnicianY92V6553957-UIM-A-0626 p. 96
Solid amber“CALL FOR FAN ONLY”TechnicianY92V6553957-UIM-A-0626 p. 96
Solid amber“G call for continuous fan”Owner can checkY92V6553957-UIM-A-0626 p. 86
Steady on (any color)“Control failure.”Technician
24 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TM9V, RG19, RGF19*E, RL18, Y81E, Y82E, Y91E, Y92E, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP
17 documents998492-UIM-C-1013 p. 24; 6019630-UIM-F-0423 p. 33; 1083286-UIM-A-0114 p. 37; 1083287-UIM-A-0114 p. 38; 1083288-UIM-A-0114 p. 36; 1083294-UIM-A-0114 p. 41; 6125051-UIM-C-0624 p. 52; 6019627-UIM-F-0423 p. 33; 6100760-UIM-C-1124 p. 62; 6100757-UIM-C-1124 p. 62; 6142403-UIM-C-1124 p. 63; 6125049-UIM-C-0624 p. 52; 6154201-UIM-B-1224 p. 82; 5750149-UIM-I-0423 p. 37; 5750148-UIM-D-0423 p. 26; 995472-UIM-B-0713 p. 26; 998491-UIM-B-1013 p. 27
Steady on (any color)“Possible control failure.”TechnicianTM9Y5750144-UIM-H-0423 p. 34
Steady on (any color)“Possible unit control board failure”TechnicianY92V6553957-UIM-A-0626 p. 87
Steady on red“Control Failure”Technician
28 seriesTM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, RGF19*E, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C
15 documents998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32
Steady on red“Open 24V control fuse OR Control Failure”TechnicianTM9Y5750144-UIM-H-0423 p. 37

What to check, code by code

York furnace 2 red flashes: pressure switch closed (Coleman, Luxaire)

Checked

Furnace control LED

2 red flashes

“Check pressure switch wiring”

Technician

Printed on 26 model series · 13 documents

TM8X, TMLX, TM9T, TG9S, GG9S, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C · 998492-UIM-C-1013 p. 26; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32

Short answer On York, Coleman and Luxaire furnaces, 2 red flashes mean the pressure switch is closed when it should be open. The manuals point to the switch or its wiring, which is technician work; the owner's manual has no step for this code. See what to check

What it means

On York, Coleman and Luxaire furnaces, 2 red flashes mean the pressure switch is closed when it should be open. In most of the installation manuals, the control checks that the pressure switch contacts are open at the beginning of each heat cycle and does not let the ignition sequence continue if they are closed. Those manuals point to a faulty pressure switch or miswiring (5750149-UIM-I-0423, p. 37; 6125049-UIM-C-0624, p. 49; 6553957-UIM-A-0626, p. 88).

The modulating YP9C, CP9C, LP9C, TP9C and TM9M manuals describe it as the pressure switch closed while the inducer pressure is below the switch setpoint, and add the pressure transducer to the checks; the TPLC-family manual names the pressure switch only (5750151-UIM-G-0423, p. 36; 1083293-UIM-A-0114, p. 39; 987158-UIM-B-1013, p. 30).

The label printed with the wiring diagram words it four ways: “Check pressure switch wiring” on most series, “Pressure switch stuck closed” on the TM9E, RGF19*E and TM9X, “PS CLOSED WITH IDM OFF” on the Y81E, RL18, Y91E, RG19 and Y92E, and “PRESSURE SWITCH CLOSED WITH IDM OFF” on the Y82E and Y92V, where the display shows 02 (5750149-UIM-I-0423, p. 40; 6019630-UIM-F-0423, p. 36; 6125049-UIM-C-0624, p. 52; 6553957-UIM-A-0626, p. 96). In the Y92V wiring-diagram legend IDM is the induced draft motor (6553957-UIM-A-0626, p. 96).

The opposite condition, the pressure switch open when it should be closed, is 3 red flashes (5750149-UIM-I-0423, p. 37).

Check these first

The owner’s manuals 1010352-UUM-O-0423 and 6100761-UUM-C-1124 have no entry for 2 red flashes. The only red pattern they list is “Rapid red flashes”, with the instruction to contact your local dealer, contractor, or service provider (1010352-UUM-O-0423, p. 5). The LED is behind a clear view port in the blower compartment door (1010352-UUM-O-0423, p. 5).

For a furnace that is not operating correctly, the manual lists visual checks to make before that call. They are the same for every code. In the manual’s order:

  1. Check that electrical power to the furnace is turned on (1010352-UUM-O-0423, p. 5).
  2. Check that the manual gas shut-off valve in the gas piping supply is in the on position (1010352-UUM-O-0423, p. 5).
  3. Check that the on/off switch on the gas valve is in the on position (1010352-UUM-O-0423, p. 5). The manual reaches this switch by setting the thermostat to its lowest setting, turning off all electric power to the appliance and removing the furnace burner access panel or door (1010352-UUM-O-0423, p. 4). Use only your hand on the switch, never tools; if it does not move by hand, do not try to repair it, and call a qualified service technician (1010352-UUM-O-0423, p. 3). Turning it back on follows the full operating instructions: turning the furnace off and on.
  4. Check that the furnace blower access panel or door is correctly positioned. The electrical power supply is cut off if this door is removed (1010352-UUM-O-0423, p. 5).

6100761-UUM-C-1124 lists the same checks (pp. 10–11).

The causes the installation manuals name for 2 red flashes are the pressure switch and its wiring. The owner’s manual gives no step for either.

When to call a licensed technician

  • The pressure switch and its wiring (5750149-UIM-I-0423, p. 37).
  • On the YP9C, CP9C, LP9C, TP9C and TM9M, the pressure transducer as well (5750151-UIM-G-0423, p. 36; 1083293-UIM-A-0114, p. 39).

The 2014 manual for the TP9C, YP9C, CP9C and LP9C warns never to bypass any safety control to allow furnace operation and never to adjust the pressure switch to allow furnace operation (1083292-UIM-A-0114, p. 41). Call as well if 2 red flashes come back.

Notes for different models
Series Label on the wiring diagram Installation manual text Source
TM9V*C; TM8V*C, TMLV*C (2013 and 2023); TM9V (2014); TM9Y; TM9T; TG9S, GG9S; TM8T*MP, TMLT*MP; TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP; TM8X, TMLX “Check pressure switch wiring” Pressure switch closed when it should be open; ignition sequence does not continue; check for a faulty pressure switch or miswiring 5750149-UIM-I-0423, pp. 37, 40; 5750148-UIM-D-0423, pp. 26, 30; 1034867-UIM-B-0913, pp. 28, 31; 1083294-UIM-A-0114, pp. 41, 44; 5750144-UIM-H-0423, pp. 35, 37; 1083286-UIM-A-0114, pp. 37, 39; 1083287-UIM-A-0114, pp. 38, 40; 995472-UIM-B-0713, pp. 26, 28; 998491-UIM-B-1013, pp. 27, 29; 998492-UIM-C-1013, pp. 24, 26
TM9E (2014 and 2023); RGF19*E; TM9X “Pressure switch stuck closed” Same 1083163-UIM-A-0214, pp. 36, 38; 6019630-UIM-F-0423, pp. 33, 36; 6019627-UIM-F-0423, pp. 33, 36; 1083288-UIM-A-0114, pp. 36, 38
Y81E, RL18, Y91E, RG19, Y92E “PS CLOSED WITH IDM OFF” Same 6100757-UIM-C-1124, pp. 57, 62; 6100760-UIM-C-1124, pp. 57, 62; 6125049-UIM-C-0624, pp. 49, 52; 6125051-UIM-C-0624, pp. 49, 52; 6154201-UIM-B-1224, pp. 77, 82
Y82E “PRESSURE SWITCH CLOSED WITH IDM OFF” Same 6142403-UIM-C-1124, pp. 58, 63
Y92V “PRESSURE SWITCH CLOSED WITH IDM OFF”, display 02 Same 6553957-UIM-A-0626, pp. 88, 96
YP9C, CP9C, LP9C, TP9C; TM9M “Check pressure switch wiring” Pressure switch closed with inducer pressure below the switch setpoint; check the pressure switch and the pressure transducer 5750151-UIM-G-0423, pp. 36, 39; 1083292-UIM-A-0114, pp. 41, 43; 1083293-UIM-A-0114, pp. 39, 41
TPLC*C, YPLC*C, CPLC*C, LPLC*C “Check pressure switch wiring” Same wording, with the pressure switch as the only check 987158-UIM-B-1013, pp. 30, 32
DGAX “Check pressure switch wiring” No text; label only 5483101-UIM-A-1118, p. 29
DGAA, DGAH (owner’s manual, green LED) 2 FLASH Combustion air pressure switch contacts stuck closed; a faulty pressure switch or mis-wiring 5165697-BUM-C-0818, p. 8

Related codes: 3 red flashes, 6 red flashes. All York, Coleman and Luxaire codes

Luxaire, York, Coleman furnace 3 red flashes: pressure switch open

Checked

Furnace control LED

3 red flashes

“Vent OR termination problem”

Technician

Printed on 17 model series · 8 documents

TM8X, TMLX, TM9V, DGAX, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C · 998492-UIM-C-1013 p. 26; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32

Short answer On York, Coleman and Luxaire furnaces, 3 red flashes mean the pressure switch is open when it should be closed. Most manuals list a faulty inducer, a blocked vent pipe, a broken switch hose, disconnected wires or a faulty switch; these are technician checks. See what to check

What it means

On York, Coleman and Luxaire furnaces, 3 red flashes mean the control found the pressure switch contacts open when they should be closed (5750149-UIM-I-0423, p. 37; 6125049-UIM-C-0624, p. 49). Most installation manuals list the causes to check: a faulty inducer, a blocked vent pipe, a broken pressure switch hose, disconnected pressure switch or inducer wires, or a faulty pressure switch (5750149-UIM-I-0423, p. 37). The modulating YP9C, CP9C, LP9C and TP9C describe it as the pressure switch open while the inducer pressure is above the switch setpoint, and add the pressure transducer to the checks (5750151-UIM-G-0423, p. 36).

The label printed with the wiring diagram words it as a vent problem on most series: “Vent, intake, OR termination problem” or “Vent OR termination problem” (5750144-UIM-H-0423, p. 37; 5750149-UIM-I-0423, p. 40). On the Y81E, RL18, Y91E, RG19 and Y92E it reads “PS OPEN WITH IDM ON”, on the Y82E “PS1 OPEN WITH IDM ON”, and on the Y92V “PS1 OPEN WITH LOW SPEED IDM ON”, with 03 on the display (6100757-UIM-C-1124, p. 62; 6142403-UIM-C-1124, p. 63; 6553957-UIM-A-0626, p. 96). The Y92V wiring-diagram legend spells out IDM as the induced draft motor and PS1 as the low pressure switch (6553957-UIM-A-0626, p. 96).

A related code is 6 red flashes. The TM9V*C label calls it “Repeated 3 Red”, and the text says the pressure switch opened four times during the call for heat, after which the furnace locks out for 1 hour and then restarts (5750149-UIM-I-0423, pp. 38, 40).

Check these first

The owner’s manuals 1010352-UUM-O-0423 and 6100761-UUM-C-1124 have no entry for 3 red flashes. The only red pattern they list is “Rapid red flashes”, with the instruction to contact your local dealer, contractor, or service provider (1010352-UUM-O-0423, p. 5). The LED is behind a clear view port in the blower compartment door (1010352-UUM-O-0423, p. 5).

For a furnace that is not operating correctly, the manual lists visual checks to make before that call. They are the same for every code. In the manual’s order:

  1. Check that electrical power to the furnace is turned on (1010352-UUM-O-0423, p. 5).
  2. Check that the manual gas shut-off valve in the gas piping supply is in the on position (1010352-UUM-O-0423, p. 5).
  3. Check that the on/off switch on the gas valve is in the on position (1010352-UUM-O-0423, p. 5). The manual reaches this switch by setting the thermostat to its lowest setting, turning off all electric power to the appliance and removing the furnace burner access panel or door (1010352-UUM-O-0423, p. 4). Use only your hand on the switch, never tools; if it does not move by hand, do not try to repair it, and call a qualified service technician (1010352-UUM-O-0423, p. 3). Turning it back on follows the full operating instructions: turning the furnace off and on.
  4. Check that the furnace blower access panel or door is correctly positioned. The electrical power supply is cut off if this door is removed (1010352-UUM-O-0423, p. 5).

6100761-UUM-C-1124 lists the same checks (pp. 10–11).

A blocked vent pipe is among the causes. The owner’s manual has one owner check that touches the vent, and it belongs to its carbon monoxide warning, not to this code: check that the furnace vent and air intake terminals are not obstructed in any way during all seasons (1010352-UUM-O-0423, p. 1). In 6100761-UUM-C-1124 that warning is introduced as applying to horizontally vented furnaces only (6100761-UUM-C-1124, p. 3).

When to call a licensed technician

The checks in the installation manuals are technician work:

  • The inducer, the pressure switch and its hose, and the pressure switch and inducer wiring (5750149-UIM-I-0423, p. 37).
  • The vent pipe (5750149-UIM-I-0423, p. 37).
  • On the YP9C, CP9C, LP9C and TP9C, the pressure transducer as well (5750151-UIM-G-0423, p. 36).

The 2014 manual for the TP9C, YP9C, CP9C and LP9C warns never to bypass any safety control to allow furnace operation and never to adjust the pressure switch to allow furnace operation (1083292-UIM-A-0114, p. 41).

Call as well if 3 red flashes keep coming back, or if the code changes to 6 red flashes. The owner’s manual’s instruction for red flashes is to contact your dealer, contractor, or service provider (1010352-UUM-O-0423, p. 5).

Notes for different models
Series Label on the wiring diagram Installation manual text Source
TM9V*C; TM8V*C, TMLV*C (2013 and 2023); TM9V (2014); TM8T*MP, TMLT*MP; TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP; TM8X, TMLX “Vent OR termination problem” Pressure switch contacts open when they should be closed 5750149-UIM-I-0423, pp. 37, 40; 5750148-UIM-D-0423, pp. 26, 30; 1034867-UIM-B-0913, pp. 28, 31; 1083294-UIM-A-0114, pp. 41, 44; 995472-UIM-B-0713, pp. 26, 28; 998491-UIM-B-1013, pp. 27, 29; 998492-UIM-C-1013, pp. 24, 26
TM9Y; TM9E (2014 and 2023); RGF19*E; TM9T; TG9S, GG9S; TM9X “Vent, intake, OR termination problem” Same 5750144-UIM-H-0423, pp. 35, 37; 1083163-UIM-A-0214, pp. 36, 38; 6019630-UIM-F-0423, pp. 33, 36; 6019627-UIM-F-0423, pp. 33, 36; 1083286-UIM-A-0114, pp. 37, 39; 1083287-UIM-A-0114, pp. 38, 40; 1083288-UIM-A-0114, pp. 36, 38
Y81E, RL18, Y91E, RG19, Y92E “PS OPEN WITH IDM ON” Same 6100757-UIM-C-1124, pp. 58, 62; 6100760-UIM-C-1124, pp. 58, 62; 6125049-UIM-C-0624, pp. 49, 52; 6125051-UIM-C-0624, pp. 49, 52; 6154201-UIM-B-1224, pp. 77, 82
Y82E “PS1 OPEN WITH IDM ON” Same 6142403-UIM-C-1124, pp. 59, 63
Y92V “PS1 OPEN WITH LOW SPEED IDM ON”, display 03 Same 6553957-UIM-A-0626, pp. 88, 96
YP9C, CP9C, LP9C, TP9C; TM9M “Vent, intake, OR termination problem” Pressure switch open with inducer pressure above the switch setpoint; check the pressure switch and the pressure transducer 5750151-UIM-G-0423, pp. 36, 39; 1083292-UIM-A-0114, pp. 41, 43; 1083293-UIM-A-0114, pp. 39, 41
TPLC*C, YPLC*C, CPLC*C, LPLC*C “Vent OR termination problem” Same wording, with the pressure switch as the only check 987158-UIM-B-1013, pp. 30, 32
DGAX “Vent OR termination problem” No text; label only 5483101-UIM-A-1118, p. 29
DGAA, DGAH (owner’s manual, green LED) 3 FLASH Combustion air pressure switch failed to close at the beginning of the heat cycle 5165697-BUM-C-0818, p. 8

Two-stage furnaces have a second pressure switch code, 13 red flashes. On the TM9V*C, the TM8V*C and the 2014 TM9V it means the high-fire pressure switch is open when it should be closed; on the TM9Y, Y82E and Y92V, the second-stage (high) pressure switch is open with a call for second-stage heat (5750149-UIM-I-0423, p. 38; 5750148-UIM-D-0423, p. 27; 1083294-UIM-A-0114, p. 42; 5750144-UIM-H-0423, p. 35; 6142403-UIM-C-1124, p. 59; 6553957-UIM-A-0626, p. 90). The TM9T and TM8T*MP labels list 13 red flashes as a vent problem, and their text has no 13 (1083286-UIM-A-0114, pp. 37, 39; 995472-UIM-B-0713, pp. 26, 28).

Related codes: 6 red flashes, 2 red flashes, 13 red flashes. All York, Coleman and Luxaire codes

York furnace 5 red flashes: rollout switch open (Coleman, Luxaire)

Checked

Furnace control LED

5 red flashes

“Flame Rollout OR open fuse”

Technician

Printed on 21 model series · 11 documents

TM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP · 998492-UIM-C-1013 p. 26; 1083163-UIM-A-0214 p. 38; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 1083292-UIM-A-0114 p. 43; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 1034867-UIM-B-0913 p. 31; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29

Short answer On York, Coleman and Luxaire furnaces, 5 red flashes point to an opened rollout switch or a limit open longer than 15 minutes, depending on the series; see the table below. Resetting the rollout switch and finding the cause are technician work. See what to check

What it means

5 red flashes point to the rollout switch in every installation manual that describes the code in text, with different wording by series:

  • On the TM9V*C, TM9V, TM8V*C, TM9T and TM8T*MP, the limit circuit has been open for more than 15 minutes, which usually means a manual-reset rollout switch has opened (5750149-UIM-I-0423, p. 38; 1083286-UIM-A-0114, p. 37).
  • On the TG9S, TM9X, TM9E, RGF19*E, TG8S*MP and TM8X, the normally closed rollout switch has opened (6019630-UIM-F-0423, p. 34; 1083287-UIM-A-0114, p. 38).
  • On the TM9Y, Y81E, RL18, Y82E, Y91E, RG19, Y92E and Y92V, either the normally closed rollout switch has opened or the limit switch has been open longer than 15 minutes (5750144-UIM-H-0423, p. 35; 6125049-UIM-C-0624, p. 49; 6553957-UIM-A-0626, p. 89).

The rollout control is manually reset (6019630-UIM-F-0423, p. 34). The installation manuals ask for checks of the combustion air, the inducer operation, and for a primary heat exchanger failure or a burner problem. The control enters a hard lockout, and power has to be cycled off and on to reset it after the problem has been corrected (5750149-UIM-I-0423, p. 38; 6019630-UIM-F-0423, p. 34).

The labels printed with the wiring diagrams read “Flame Rollout” or “Flame Rollout OR open fuse” on most series, and “LS / ROS OPEN GREATER THAN 15 MIN.” on the Y81E, RL18, Y82E, Y91E, RG19, Y92E and Y92V (5750149-UIM-I-0423, p. 40; 1083294-UIM-A-0114, p. 44; 6125049-UIM-C-0624, p. 52; 6553957-UIM-A-0626, p. 96). In the Y92V legend LS is the limit switch and ROS the rollout switch (6553957-UIM-A-0626, p. 96). In the TM9V*C manual, a main limit that stays open shows 4 red flashes first, 11 red flashes after 5 minutes and 5 red flashes after 15 minutes (5750149-UIM-I-0423, p. 38).

The modulating YP9C, CP9C, LP9C, TP9C and the TPLC, YPLC, CPLC, LPLC add a second switch: “Rollout switch or condensate pressure switch open.” (5750151-UIM-G-0423, p. 37; 987158-UIM-B-1013, p. 30). Their manuals put the rollout switches on the burner assembly and do not describe a lockout for this code. On the TM9M a blown fuse on the circuit board can also cause it (1083293-UIM-A-0114, p. 39).

Check these first

The owner’s manuals 1010352-UUM-O-0423 and 6100761-UUM-C-1124 have no entry for 5 red flashes. The only red pattern they list is “Rapid red flashes”, with the instruction to contact your local dealer, contractor, or service provider (1010352-UUM-O-0423, p. 5). The LED is behind a clear view port in the blower compartment door (1010352-UUM-O-0423, p. 5).

For a furnace that is not operating correctly, the manual lists visual checks to make before that call. They are the same for every code. In the manual’s order:

  1. Check that electrical power to the furnace is turned on (1010352-UUM-O-0423, p. 5).
  2. Check that the manual gas shut-off valve in the gas piping supply is in the on position (1010352-UUM-O-0423, p. 5).
  3. Check that the on/off switch on the gas valve is in the on position (1010352-UUM-O-0423, p. 5). The manual reaches this switch by setting the thermostat to its lowest setting, turning off all electric power to the appliance and removing the furnace burner access panel or door (1010352-UUM-O-0423, p. 4). Use only your hand on the switch, never tools; if it does not move by hand, do not try to repair it, and call a qualified service technician (1010352-UUM-O-0423, p. 3). Turning it back on follows the full operating instructions: turning the furnace off and on.
  4. Check that the furnace blower access panel or door is correctly positioned. The electrical power supply is cut off if this door is removed (1010352-UUM-O-0423, p. 5).

6100761-UUM-C-1124 lists the same checks (pp. 10–11).

The rollout switch is not among the owner’s steps. The YP9C-family installation manual describes a manual-reset rollout switch on the burner assembly and says that if it cannot be reset or trips again, contact a qualified serviceman (5750151-UIM-G-0423, p. 37). The owner’s manuals do not give a rollout reset to the owner, and these pages treat it as technician work.

When to call a licensed technician

  • The rollout switch and its manual reset (6019630-UIM-F-0423, p. 34; 5750151-UIM-G-0423, p. 37).
  • The combustion air, the inducer, the primary heat exchanger and the burner (5750149-UIM-I-0423, p. 38).
  • On the modulating furnaces, the condensate pressure switch (5750151-UIM-G-0423, p. 37).
  • The hard lockout. The installation manuals reset it by cycling power after the problem has been corrected (5750149-UIM-I-0423, p. 38); the owner’s manuals do not describe a reset.

Call as well if 5 red flashes come back. The owner’s manual says the user must not purchase, install, or replace any components of the furnace (1010352-UUM-O-0423, p. 5).

Notes for different models
Series Label on the wiring diagram Installation manual text Source
TM9V*C; TM8V*C, TMLV*C (2013 and 2023); TM9V (2014); TM9T; TM8T*MP, TMLT*MP “Flame Rollout” (TM9V*C, TM8V*C 2023); “Flame Rollout OR open fuse” (the others) Limit circuit open more than 15 min, usually a manual-reset rollout switch; hard lockout 5750149-UIM-I-0423, pp. 38, 40; 5750148-UIM-D-0423, pp. 27, 30; 1034867-UIM-B-0913, pp. 28, 31; 1083294-UIM-A-0114, pp. 42, 44; 1083286-UIM-A-0114, pp. 37, 39; 995472-UIM-B-0713, pp. 26, 28
TG9S, GG9S; TM9X; TM9E (2014 and 2023); RGF19*E; TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP; TM8X, TMLX “Flame Rollout OR open fuse” (2013–2014 manuals); “Flame Rollout” (TM9E 2023, RGF19*E) Normally closed rollout switch opened, manual reset; hard lockout 1083287-UIM-A-0114, pp. 38, 40; 1083288-UIM-A-0114, pp. 36, 38; 1083163-UIM-A-0214, pp. 36, 38; 6019630-UIM-F-0423, pp. 34, 36; 6019627-UIM-F-0423, pp. 34, 36; 998491-UIM-B-1013, pp. 27, 29; 998492-UIM-C-1013, pp. 24, 26
TM9Y “Flame Rollout” Rollout switch opened or limit open longer than 15 min; hard lockout 5750144-UIM-H-0423, pp. 35, 37
Y81E, RL18, Y82E, Y91E, RG19, Y92E “LS / ROS OPEN GREATER THAN 15 MIN.” Same as TM9Y 6100757-UIM-C-1124, pp. 58, 62; 6100760-UIM-C-1124, pp. 58, 62; 6142403-UIM-C-1124, pp. 59, 63; 6125049-UIM-C-0624, pp. 49, 52; 6125051-UIM-C-0624, pp. 49, 52; 6154201-UIM-B-1224, pp. 77, 82
Y92V “LS / ROS OPEN GREATER THAN 15 MIN.”, display 05 Same as TM9Y 6553957-UIM-A-0626, pp. 89, 96
YP9C, CP9C, LP9C, TP9C; TPLC*C, YPLC*C, CPLC*C, LPLC*C “Flame Rollout” (5750151-UIM-G-0423, 987158-UIM-B-1013); “Flame Rollout OR open fuse” (1083292-UIM-A-0114) “Rollout switch or condensate pressure switch open.”; manual-reset rollout switch on the burner assembly 5750151-UIM-G-0423, pp. 37, 39; 1083292-UIM-A-0114, pp. 41, 43; 987158-UIM-B-1013, pp. 30, 32
TM9M “Flame Rollout OR open fuse” Rollout switch opened, manual reset; a blown fuse on the circuit board can also cause it 1083293-UIM-A-0114, pp. 39, 41
DGAX “Auxiliary limit OR open fuse” No text; label only 5483101-UIM-A-1118, p. 29
DGAA, DGAH (owner’s manual, green LED) 5 FLASH “Gas flow with no call for heat.” 5165697-BUM-C-0818, p. 8

On the DGAX the label gives 5 red flashes a different meaning from the rollout rows above (5483101-UIM-A-1118, p. 29). The DGAA and DGAH manual, for manufactured-home furnaces, uses 5 flashes of a green LED for gas flow with no call for heat and asks for a check of the gas valve and its wiring (5165697-BUM-C-0818, p. 8).

Related codes: 4 red flashes, 11 red flashes. All York, Coleman and Luxaire codes

Coleman, York, Luxaire furnace 7 red flashes (code 7): ignition lockout

Checked

Furnace control LED

7 red flashes

“Failed to light burners”

Technician

Printed on 29 model series · 16 documents

TM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C · 998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32

Short answer On York, Coleman and Luxaire furnaces, 7 red flashes mean no flame after three trials for ignition; the furnace locks out for 1 hour, then tries again. Check that the manual gas shut-off valve is on; gas pressure, ignitor and flame sensor are technician work. See what to check

What it means

On York, Coleman and Luxaire furnaces, 7 red flashes mean the flame could not be established during three trials for ignition. The furnace locks out for 1 hour and then restarts (5750149-UIM-I-0423, p. 38; 6125049-UIM-C-0624, p. 49). Most installation manuals list what to check: that the gas valve switch is in the ON position, then low or no gas pressure, a faulty gas valve, a dirty or faulty flame sensor, a faulty hot surface ignitor, loose wires or a burner problem (5750149-UIM-I-0423, p. 38).

The modulating YP9C, CP9C, LP9C, TP9C, TM9M and TPLC-family manuals call it “Lockout due to no ignition”: the control tries three times, locks out for one hour if there is no flame, then tries again to light. Their check list is the gas supply, the ignitor, the gas valve and the flame sensor (5750151-UIM-G-0423, p. 37; 987158-UIM-B-1013, p. 30).

The wiring-diagram labels say “Failed to light burners” on most series and “LOCKOUT DUE TO FAILED IGNITION” on the Y81E, RL18, Y82E, Y91E, RG19, Y92E and Y92V (5750149-UIM-I-0423, p. 40; 6100757-UIM-C-1124, p. 62; 6553957-UIM-A-0626, p. 96).

The installation manuals describe a soft lockout that resets automatically after 1 hour, with a temporary interruption in the gas supply as the example: the control keeps trying to light each hour and resumes normal operation if the gas supply is restored (5750149-UIM-I-0423, p. 38).

The documents give this code as a count of flashes. The only series here that also shows it as a number is the Y92V, whose display reads 07 with 7 red flashes (6553957-UIM-A-0626, p. 89).

Check these first

The owner’s manuals 1010352-UUM-O-0423 and 6100761-UUM-C-1124 have no entry for 7 red flashes. The only red pattern they list is “Rapid red flashes”, with the instruction to contact your local dealer, contractor, or service provider (1010352-UUM-O-0423, p. 5). The LED is behind a clear view port in the blower compartment door (1010352-UUM-O-0423, p. 5).

For a furnace that is not operating correctly, the manual lists visual checks to make before that call. They are the same for every code. In the manual’s order:

  1. Check that electrical power to the furnace is turned on (1010352-UUM-O-0423, p. 5).
  2. Check that the manual gas shut-off valve in the gas piping supply is in the on position (1010352-UUM-O-0423, p. 5).
  3. Check that the on/off switch on the gas valve is in the on position (1010352-UUM-O-0423, p. 5). The manual reaches this switch by setting the thermostat to its lowest setting, turning off all electric power to the appliance and removing the furnace burner access panel or door (1010352-UUM-O-0423, p. 4). Use only your hand on the switch, never tools; if it does not move by hand, do not try to repair it, and call a qualified service technician (1010352-UUM-O-0423, p. 3). Turning it back on follows the full operating instructions: turning the furnace off and on.
  4. Check that the furnace blower access panel or door is correctly positioned. The electrical power supply is cut off if this door is removed (1010352-UUM-O-0423, p. 5).

6100761-UUM-C-1124 lists the same checks (pp. 10–11).

Step 3 is also the first check most installation manuals give for 7 red flashes: that the gas valve switch is in the ON position (5750149-UIM-I-0423, p. 38). The operating instructions in the owner’s manual count the same three trials: if the appliance does not operate after three trials for ignition, follow “Turning off the appliance” and call your service technician or gas supplier (1010352-UUM-O-0423, p. 4).

When to call a licensed technician

The rest of the installation manuals’ list is technician work (5750149-UIM-I-0423, p. 38; 5750151-UIM-G-0423, p. 37):

  • Low or no gas pressure, and the gas valve.
  • The flame sensor, dirty or faulty.
  • The hot surface ignitor.
  • Loose wires, and the burner.

The owner’s manual names your service technician or gas supplier as the call after three failed trials (1010352-UUM-O-0423, p. 4). Call as well if 7 red flashes come back after the 1-hour lockout, or if the code changes to 8 red flashes.

Notes for different models
Series Label on the wiring diagram Installation manual text Source
TM9V*C; TM8V*C, TMLV*C (2013 and 2023); TM9V (2014); TM9Y; TM9T; TG9S, GG9S; TM9X; TM9E (2014 and 2023); RGF19*E; TM8T*MP, TMLT*MP; TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP; TM8X, TMLX “Failed to light burners” No flame in three trials for ignition; check the gas valve switch, gas pressure, gas valve, flame sensor, hot surface ignitor, wires, burner; 1-hour lockout, then restart 5750149-UIM-I-0423, pp. 38, 40; 5750148-UIM-D-0423, pp. 27, 30; 1034867-UIM-B-0913, pp. 28, 31; 1083294-UIM-A-0114, pp. 42, 44; 5750144-UIM-H-0423, pp. 35, 37; 1083286-UIM-A-0114, pp. 37, 39; 1083287-UIM-A-0114, pp. 38, 40; 1083288-UIM-A-0114, pp. 36, 38; 1083163-UIM-A-0214, pp. 36, 38; 6019630-UIM-F-0423, pp. 34, 36; 6019627-UIM-F-0423, pp. 34, 36; 995472-UIM-B-0713, pp. 26, 28; 998491-UIM-B-1013, pp. 27, 29; 998492-UIM-C-1013, pp. 24, 26
Y81E, RL18, Y82E, Y91E, RG19, Y92E “LOCKOUT DUE TO FAILED IGNITION” Same 6100757-UIM-C-1124, pp. 58, 62; 6100760-UIM-C-1124, pp. 58, 62; 6142403-UIM-C-1124, pp. 59, 63; 6125049-UIM-C-0624, pp. 49, 52; 6125051-UIM-C-0624, pp. 49, 52; 6154201-UIM-B-1224, pp. 78, 82
Y92V “LOCKOUT DUE TO FAILED IGNITION”, display 07 Same 6553957-UIM-A-0626, pp. 89, 96
YP9C, CP9C, LP9C, TP9C; TM9M; TPLC*C, YPLC*C, CPLC*C, LPLC*C “Failed to light burners” “Lockout due to no ignition.” Three tries, one-hour lockout, then the control tries again; check the gas supply, ignitor, gas valve, flame sensor 5750151-UIM-G-0423, pp. 37, 39; 1083292-UIM-A-0114, pp. 41, 43; 1083293-UIM-A-0114, pp. 39, 41; 987158-UIM-B-1013, pp. 30, 32
DGAX “Failed to light burners” No text; label only 5483101-UIM-A-1118, p. 29
DGAA, DGAH (owner’s manual, green LED) No 7 FLASH in the list Ignition failure is 1 FLASH on these furnaces 5165697-BUM-C-0818, p. 8

The DGAA and DGAH manual is for furnaces in manufactured homes, and its numbered flashes do not match the red codes of the 33-inch furnaces. Its 60-minute automatic reset covers fault 1 (5165697-BUM-C-0818, p. 8).

Related codes: 8 red flashes, 1 red flash. All York, Coleman and Luxaire codes

York furnace 8 red flashes: flame lost, 1-hour lockout (Coleman, Luxaire)

Checked

Furnace control LED

8 red flashes

“Loss of flame during call for heat”

Technician

Printed on 29 model series · 16 documents

TM8X, TMLX, TM9E, TM9T, TG9S, GG9S, TM9X, TP9C, YP9C, CP9C, LP9C, TM9M, TM9V, DGAX, RGF19*E, TM9Y, TM9V*C, TM8V*C, TMLV*C, TM8T*MP, TMLT*MP, TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP, TPLC*C, YPLC*C, CPLC*C, LPLC*C · 998492-UIM-C-1013 p. 26; 6019630-UIM-F-0423 p. 36; 1083286-UIM-A-0114 p. 39; 1083287-UIM-A-0114 p. 40; 1083288-UIM-A-0114 p. 38; 5750151-UIM-G-0423 p. 39; 1083293-UIM-A-0114 p. 41; 1083294-UIM-A-0114 p. 44; 5483101-UIM-A-1118 p. 29; 6019627-UIM-F-0423 p. 36; 5750144-UIM-H-0423 p. 37; 5750149-UIM-I-0423 p. 40; 5750148-UIM-D-0423 p. 30; 995472-UIM-B-0713 p. 28; 998491-UIM-B-1013 p. 29; 987158-UIM-B-1013 p. 32

Short answer On York, Coleman and Luxaire furnaces, 8 red flashes mean the flame was lost five times in one heating cycle; the furnace locks out for 1 hour, then restarts. The listed causes (low gas pressure, the flame sensor, the gas valve) are technician work. See what to check

What it means

On York, Coleman and Luxaire furnaces, 8 red flashes mean the flame was lost five times (four recycles) during the heating cycle. The furnace locks out for 1 hour and then restarts. The installation manuals point to low gas pressure, a dirty or faulty flame sensor, or a faulty gas valve (5750149-UIM-I-0423, p. 38; 6125049-UIM-C-0624, p. 49).

The modulating YP9C, CP9C, LP9C, TP9C, TM9M and TPLC-family manuals call it “Lockout due to too many flame recycles”: the flame was lost five times during a single heating cycle, which could be caused by a faulty gas valve, low gas pressure or a dirty flame sensor; the control locks out for one hour and then tries again (5750151-UIM-G-0423, p. 37; 987158-UIM-B-1013, p. 30).

The wiring-diagram labels say “Loss of flame during call for heat” on most series and “LOCKOUT DUE TO FLAME DROPOUTS” on the Y81E, RL18, Y82E, Y91E, RG19, Y92E and Y92V (5750149-UIM-I-0423, p. 40; 6100757-UIM-C-1124, p. 62; 6553957-UIM-A-0626, p. 96).

The installation manuals describe a soft lockout that resets automatically after 1 hour, with a temporary interruption in the gas supply as the example: the control keeps trying to light each hour and resumes normal operation if the gas supply is restored (5750149-UIM-I-0423, p. 38). For comparison, 7 red flashes mean the flame could not be established during three trials for ignition (5750149-UIM-I-0423, p. 38).

Check these first

The owner’s manuals 1010352-UUM-O-0423 and 6100761-UUM-C-1124 have no entry for 8 red flashes. The only red pattern they list is “Rapid red flashes”, with the instruction to contact your local dealer, contractor, or service provider (1010352-UUM-O-0423, p. 5). The LED is behind a clear view port in the blower compartment door (1010352-UUM-O-0423, p. 5).

For a furnace that is not operating correctly, the manual lists visual checks to make before that call. They are the same for every code. In the manual’s order:

  1. Check that electrical power to the furnace is turned on (1010352-UUM-O-0423, p. 5).
  2. Check that the manual gas shut-off valve in the gas piping supply is in the on position (1010352-UUM-O-0423, p. 5).
  3. Check that the on/off switch on the gas valve is in the on position (1010352-UUM-O-0423, p. 5). The manual reaches this switch by setting the thermostat to its lowest setting, turning off all electric power to the appliance and removing the furnace burner access panel or door (1010352-UUM-O-0423, p. 4). Use only your hand on the switch, never tools; if it does not move by hand, do not try to repair it, and call a qualified service technician (1010352-UUM-O-0423, p. 3). Turning it back on follows the full operating instructions: turning the furnace off and on.
  4. Check that the furnace blower access panel or door is correctly positioned. The electrical power supply is cut off if this door is removed (1010352-UUM-O-0423, p. 5).

6100761-UUM-C-1124 lists the same checks (pp. 10–11).

Low gas pressure is among the causes. The owner’s checks that concern gas are the manual shut-off valve and the switch on the gas valve (steps 2 and 3); the owner’s manual gives the owner no way to check gas pressure.

When to call a licensed technician

The causes in the installation manuals are technician work (5750149-UIM-I-0423, p. 38; 5750151-UIM-G-0423, p. 37):

  • Low gas pressure.
  • The flame sensor, dirty or faulty.
  • The gas valve.

Call as well if 8 red flashes come back after the 1-hour lockout. The owner’s manual says the user must not purchase, install, or replace any components of the furnace (1010352-UUM-O-0423, p. 5).

Notes for different models
Series Label on the wiring diagram Installation manual text Source
TM9V*C; TM8V*C, TMLV*C (2013 and 2023); TM9V (2014); TM9Y; TM9T; TG9S, GG9S; TM9X; TM9E (2014 and 2023); RGF19*E; TM8T*MP, TMLT*MP; TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP; TM8X, TMLX “Loss of flame during call for heat” Flame lost five times (four recycles) during the heating cycle; check gas pressure, flame sensor, gas valve; 1-hour lockout, then restart 5750149-UIM-I-0423, pp. 38, 40; 5750148-UIM-D-0423, pp. 27, 30; 1034867-UIM-B-0913, pp. 28, 31; 1083294-UIM-A-0114, pp. 42, 44; 5750144-UIM-H-0423, pp. 35, 37; 1083286-UIM-A-0114, pp. 37, 39; 1083287-UIM-A-0114, pp. 38, 40; 1083288-UIM-A-0114, pp. 36, 38; 1083163-UIM-A-0214, pp. 36, 38; 6019630-UIM-F-0423, pp. 34, 36; 6019627-UIM-F-0423, pp. 34, 36; 995472-UIM-B-0713, pp. 26, 28; 998491-UIM-B-1013, pp. 27, 29; 998492-UIM-C-1013, pp. 24, 26
Y81E, RL18, Y82E, Y91E, RG19, Y92E “LOCKOUT DUE TO FLAME DROPOUTS” Same 6100757-UIM-C-1124, pp. 58, 62; 6100760-UIM-C-1124, pp. 58, 62; 6142403-UIM-C-1124, pp. 59, 63; 6125049-UIM-C-0624, pp. 49, 52; 6125051-UIM-C-0624, pp. 49, 52; 6154201-UIM-B-1224, pp. 78, 82
Y92V “LOCKOUT DUE TO FLAME DROPOUTS”, display 08 Same 6553957-UIM-A-0626, pp. 89, 96
YP9C, CP9C, LP9C, TP9C; TM9M; TPLC*C, YPLC*C, CPLC*C, LPLC*C “Loss of flame during call for heat” “Lockout due to too many flame recycles.” Flame lost five times in a single heating cycle; one-hour lockout, then the control tries again 5750151-UIM-G-0423, pp. 37, 39; 1083292-UIM-A-0114, pp. 41, 43; 1083293-UIM-A-0114, pp. 39, 41; 987158-UIM-B-1013, pp. 30, 32
DGAX “Loss of flame during call for heat” No text; label only 5483101-UIM-A-1118, p. 29

The DGAA and DGAH owner’s manual for manufactured-home furnaces has no 8 FLASH entry in its list (5165697-BUM-C-0818, p. 8).

Related codes: 7 red flashes, 1 red flash. All York, Coleman and Luxaire codes

How to read a York, Coleman or Luxaire furnace code

These pages cover residential gas furnaces sold as York, Coleman and Luxaire. Their manuals are Johnson Controls documents, and most of them name model series on the cover rather than a brand (see one set of documents for three brands).

The control board shows its state with one LED that flashes red, green or amber. The owner’s manuals say it sits behind a clear view port in the blower compartment door (1010352-UUM-O-0423, p. 5; 6100761-UUM-C-1124, p. 11).

Slow flashes are normal states. In the installation manuals a slow flash is 2 seconds on and 2 seconds off: slow green is normal operation with no thermostat call, slow amber is normal operation with a call for heat (5750149-UIM-I-0423, p. 37). The Y91E, RG19 and Y92E manuals give slow green a wider meaning, “Standby, normal operation, fan only, and call for cooling.” (6125049-UIM-C-0624, p. 49; 6154201-UIM-B-1224, p. 77). The wiring-diagram labels of the Y81E, RL18, Y82E, Y91E, RG19 and Y92E call the two slow states “GREEN HEARTBEAT” and “AMBER HEARTBEAT” (6100757-UIM-C-1124, p. 62; 6142403-UIM-C-1124, p. 63; 6125049-UIM-C-0624, p. 52; 6154201-UIM-B-1224, p. 82).

A code is a count of quick flashes followed by a pause. Most installation manuals give 1/3 second on and 1/3 second off for each flash and a 2-second pause between codes (5750149-UIM-I-0423, p. 37). The manuals for the modulating YP9C, CP9C, LP9C and TP9C give 1/4 second on and off and a 2-second off period between sets of flashes (5750151-UIM-G-0423, p. 36), and the owner’s manuals also give 1/4 second (1010352-UUM-O-0423, p. 5).

  • Red counts are fault codes; the 2014 quick reference guides sum it up as “Any Red Flash”, “Fault condition.” (1083301-URG-A-0114, p. 1; 1083298-URG-A-0114, p. 1). The installation manuals list red codes from 1 flash up to 15, depending on the series. The Y92V has no 14 or 15: the two low-voltage codes that are 14 and 15 red flashes on the Y81E, RL18, Y82E, Y91E, RG19 and Y92E are 17 and 18 red flashes on the Y92V (6100757-UIM-C-1124, p. 58; 6125049-UIM-C-0624, p. 50; 6553957-UIM-A-0626, p. 90).
  • On most series the only amber count is 4 amber flashes, a thermostat wiring alert (5750149-UIM-I-0423, p. 38). The modulating YP9C, CP9C, LP9C, TP9C, TM9M and TPLC, YPLC, CPLC, LPLC also use amber and green counts for normal states, for example 2 amber flashes for normal operation with a call for heat (5750151-UIM-G-0423, p. 36; 987158-UIM-B-1013, p. 30).
  • Other patterns, as the TM9V*C manual words them: a steady light of any color is a control failure, and an LED that does not flash at all points to power to the board or a blown fuse on it (5750149-UIM-I-0423, p. 37). A continuous amber flash in its text and a rapid amber flash on its label both mean low flame sense current (5750149-UIM-I-0423, pp. 37, 40). On the Y81E, RL18, Y82E, Y91E, RG19, Y92E and Y92V, alternating red and amber flashes mean a refrigerant leak was detected near the furnace (6100757-UIM-C-1124, p. 57; 6142403-UIM-C-1124, p. 58; 6553957-UIM-A-0626, p. 87).

The owner’s manuals for 33-inch furnaces decode only four states: slow green flashes, normal operation; double amber flashes, normal heating operation on modulating furnace models only; slow amber flashes, normal operation with call for heat; and rapid red flashes, “There is a problem with the operation of this furnace. Contact your local dealer, contractor, or service provider.” (1010352-UUM-O-0423, p. 5). They refer to flash sequence codes “1 through 10” (1010352-UUM-O-0423, p. 5) or “1 to 15” (6100761-UUM-C-1124, p. 11) without listing them. The Y92V owner’s manual also says 1 to 15 (6647854-UUM-B-0626, p. 11), while the Y92V installation manual uses 17 and 18.

The Y92V control adds three 7-segment displays and four buttons (6553957-UIM-A-0626, pp. 74–75). The displays show an active fault as a two-digit number, for example 04 together with 4 red flashes, and a thermostat call as H1, H2, HP or CC (6553957-UIM-A-0626, pp. 87–88).

Stored codes and the LAST ERROR button

The control boards in the installation manuals store up to five error codes and keep them when power is lost. The manuals describe a LAST ERROR button on the board for reading and clearing them, say the feature is for a qualified service technician only, and note that it works only when there is no active thermostat call (5750149-UIM-I-0423, p. 38; 5750151-UIM-G-0423, p. 37; 6100757-UIM-C-1124, p. 59; 6125049-UIM-C-0624, p. 50; 6154201-UIM-B-1224, pp. 78–79). The button’s name differs between documents: the wiring-diagram label in the TM9V*C manual calls it the ERROR button (5750149-UIM-I-0423, p. 40), and the Y91E, RG19 and Y92E manuals describe retrieval a second time with an SW button (6125049-UIM-C-0624, p. 50; 6154201-UIM-B-1224, p. 79). On the Y92V the history is the L5F menu on the displays, also for a qualified service technician only (6553957-UIM-A-0626, pp. 92–93). These pages do not repeat the procedures.

If you see two green flashes after someone has pressed the button, that is the board’s reply that no codes are stored; three green flashes confirm that the memory was cleared (5750149-UIM-I-0423, p. 38).

Why a flash count needs the series

The same count means different things on different series. Five rows from the installation manuals:

Code TM9V*C (2023) Y91E, RG19, Y92E YP9C, CP9C, LP9C, TP9C (2023) TPLC, YPLC, CPLC, LPLC Y92V
4 red flashes Main limit switch open Main limit switch open “High limit switch open or defective temperature sensor or 24 volt fuse is open.” Same as YP9C Main limit switch open (display 04)
5 red flashes Limit circuit open more than 15 minutes, usually a manual-reset rollout switch Rollout switch open, or limit switch open longer than 15 minutes “Rollout switch or condensate pressure switch open.” Same as YP9C Same as Y91E (display 05)
6 red flashes Pressure switch opened four times during the call for heat Pressure switch opened five times “Gas valve communication error.” “Current failure on modulating gas valve.” Four times (display 06)
12 red flashes “This indicates a loose or missing model ID plug.” Not listed ID plug not present or not connected properly Same as YP9C “Model ID configuration error” (display 12)
4 amber flashes Y signal from the thermostat without a G signal Same as TM9V*C Heating capacity reduced by a restriction in the circulating air system Same as YP9C Same as TM9V*C (display 44)

Sources: 5750149-UIM-I-0423, pp. 37–38; 6125049-UIM-C-0624, pp. 49–50; 6154201-UIM-B-1224, pp. 77–78; 5750151-UIM-G-0423, pp. 36–37; 987158-UIM-B-1013, p. 30; 6553957-UIM-A-0626, pp. 88–91. Older manuals word several rows differently again; each code page lists every series.

Within one manual, the text and the label printed with the wiring diagram do not always agree. The TM9V*C label calls 6 red flashes “Repeated 3 Red” and has no row for 12 red flashes, which the text lists (5750149-UIM-I-0423, pp. 38, 40). The Y92E label lists 13 red flashes, “PS2 OPEN WITH IDM ON”, and the Y92E text has no 13 (6154201-UIM-B-1224, pp. 77–78, 82). The documents do not say which one to follow, so the code pages quote both.

Revisions differ too. The 2014 TM9V manual has no 12 red flashes; the 2023 TM9V*C manual has it (1083294-UIM-A-0114, pp. 41–42; 5750149-UIM-I-0423, p. 38). The 2013–2014 quick reference guides for the TM9V, TM8V/TMLV, TM8T/TMLT and TG8S/TGLS/GG8S/GGLS call a slow amber flash normal operation with a call for cooling and two amber flashes normal operation with a call for heat (1083301-URG-A-0114, p. 1; 523354-URG-C-0513, p. 1; 521574-URG-B-0413, p. 1; 530287-URG-B-0413, p. 1). The installation manuals for the same series call a slow amber flash normal operation with a call for heat and have no two amber flashes (1083294-UIM-A-0114, p. 41; 1034867-UIM-B-0913, p. 27).

One set of documents for three brands

Johnson Controls’ 2014 technical-literature archive on upgnet.com has separate York, Luxaire and Coleman discs. The 28 document numbers found on more than one disc have the same text on each (compared October 21, 2026). The covers name model series, not brands, and several print one series under more than one first letter: “YP9C, CP9C, LP9C, TP9C Series” (5750151-UIM-G-0423, p. 1), “TPLC*C, YPLC*C, CPLC*C, LPLC*C” (987158-UIM-B-1013, p. 1), “TG9S and GG9S Series” (1083287-UIM-A-0114, p. 1). The documents do not say which first letter belongs to which brand, so these pages give the series printed on a cover and do not call any manual “the York manual” or “the Coleman manual”.

The owner’s manuals cover “All Residential Multi-position Gas Furnaces (33 in. Models)” and list no series on the cover (1010352-UUM-O-0423, p. 1). The yorknow.com site attaches 1010352-UUM-O-0423 to its TM9V, TM9Y, TM9E, TM8V, YP9C and RGF19*E furnaces and 6100761-UUM-C-1124 to the Y81E, Y82E, Y91E, Y92E, RL18 and RG19; the Y92V has its own owner’s manual, 6647854-UUM-B-0626. The same store lists the RL18, RG19, RGF19*E and DGAX under the Guardian name (yorknow.com, checked October 21, 2026).

Coleman’s site, colemanac.com, redirected to a “Website Offline” page on October 21, 2026. The Coleman documents available are on the 2014 Coleman disc of the archive. Its catalog lists, among others, the CP9C, CPLC, TG8S/TGLS, TG9S, TM8T/TMLT, TM8V/TMLV, TM8X/TMLX, TM9M, TM9T, TM9V and TM9X. For several of these series it gives earlier document numbers than the York and Luxaire discs, and 39 of the files it lists returned “not found”. These pages use the document numbers from the York and Luxaire discs and the current files.

Furnaces for manufactured homes have their own manuals. The DGAA and DGAH owner’s manual prints a numbered list for a green LED, 1 to 5 flashes, and its meanings differ from the red codes of the 33-inch furnaces: 1 flash there is “Ignition failure.” (5165697-BUM-C-0818, p. 8). The MM9E and MG9S owner’s manual has the same four LED lines as the 33-inch manuals (5165698-UUM-C-0519, p. 5), and no installation manual with a code list was available for those series. The DGAX installation manual has a code label and does not describe the codes in its text (5483101-UIM-A-1118, p. 29).

What the documents do not say:

  • Which control board or board revision shows which table. The code tables name no board; board part numbers appear only in parts lists.
  • Whether a furnace without its own installation manual uses another series’ table. The installation manuals for the Z8ES, Z8ET, Z8VT, Z9ES, Z9ET, Z9VT, Y82V, Y9VV, TM8E, TM8Y, TMLE, TL8E and TL9E were not available without a login on October 21, 2026. The owner’s manual 6100761-UUM-C-1124 names several of them next to the Y81E and Y82E (p. 1), but no document says they use the Y81E or Y82E tables.
  • Anything about a “Diamond 80” or “Diamond 90”. The word does not appear in any of the documents used here, so these pages cannot match such a furnace to a table.
  • Anything about “QMID”. It does not appear in any of the furnace documents used here; in search suggestions it shows up next to windows, doors, water heaters and heat pumps (Google autocomplete, checked October 21, 2026).

Finding the rows for your furnace

  1. Find the model number. The installation manuals refer to the unit rating plate for it (5750149-UIM-I-0423, p. 2). Model numbers start with the series: the TM9V*C manual’s tables list models such as TM9V040A10 and TM9V060B12 (5750149-UIM-I-0423, p. 11).
  2. Match the start of the model number to a series in the table. The series names are printed as on the installation manual covers, including suffixes such as TM9V*C or TG8S*MP.
  3. Check the revision. Several series have a 2013–2014 manual and a 2023 manual, and they differ (see above). Each row of the table names its document and page, and the document list on this page gives each revision.
  4. If your series is not in the table, these pages cannot tell you what your code means.

What the owner’s manual tells you to do

The owner’s manuals give no step for any single code. For red flashes their instruction is to contact your local dealer, contractor, or service provider (1010352-UUM-O-0423, p. 5). Their section “Troubleshooting problems” lists visual checks to make before that call when the furnace is not operating correctly. In 1010352-UUM-O-0423 the order is:

  1. Check that electrical power to the furnace is turned on (1010352-UUM-O-0423, p. 5).
  2. Check that the manual gas shut-off valve in the gas piping supply is in the on position (1010352-UUM-O-0423, p. 5).
  3. Check that the on/off switch on the gas valve is in the on position (1010352-UUM-O-0423, p. 5). The manual reaches this switch by setting the thermostat to its lowest setting, turning off all electric power to the appliance and removing the furnace burner access panel or door (1010352-UUM-O-0423, p. 4). Use only your hand on the switch, never tools; if it does not move by hand, do not try to repair it, and call a qualified service technician (1010352-UUM-O-0423, p. 3).
  4. Check that the furnace blower access panel or door is correctly positioned. The electrical power supply is cut off if this door is removed (1010352-UUM-O-0423, p. 5).

6100761-UUM-C-1124 prints the same four checks (pp. 10–11). The list is for a furnace that is not operating correctly and is not tied to a code.

Under user maintenance the manual covers the external air filters. Filters must be installed outside the furnace casing, never inside the cabinet; some installations have them in a rack on the casing or in the return air duct, and if the location or the replacement process is not obvious, contact your installer or service technician (1010352-UUM-O-0423, p. 4). High-velocity filters can be cleaned with a vacuum cleaner or washed with a garden hose and must dry completely before they go back in; throwaway filters are replaced with new filters of the same size (1010352-UUM-O-0423, p. 5). In 6100761-UUM-C-1124 the user maintenance section opens with a warning: make sure the area is well ventilated, turn the thermostat off, wait for a running blower to stop, turn off the gas and electrical power supplies to the furnace, and check that metal parts have cooled to room temperature before you begin (6100761-UUM-C-1124, p. 9).

The manual also says: “The user must not purchase, install, or replace any components of this furnace.” (1010352-UUM-O-0423, p. 5).

Turning the furnace off and on

The steps in 1010352-UUM-O-0423 under “Turning off the appliance” (p. 4):

  1. Set the thermostat to the lowest setting in the heating mode.
  2. Turn off all electric power to the appliance if servicing the appliance.
  3. Remove the furnace burner access panel or door.
  4. Move the gas control switch to the off position.
  5. Replace the furnace burner access panel or door.

Step 2 carries a condition here. In the operating instructions on the same page, “Turn off all electric power to the appliance.” has no condition and comes before the panel is removed (1010352-UUM-O-0423, p. 4). After these steps, 6100761-UUM-C-1124 prints a warning: should overheating occur or the gas valve fail to shut off, turn the external manual gas valve in the gas supply line to the furnace to off and let the furnace cool before shutting off the electric power supply (6100761-UUM-C-1124, p. 8).

To start the furnace, the operating instructions begin with reading the safety information, then set the thermostat to the lowest setting, turn off all electric power, remove the burner access panel, move the gas control switch to off and wait 5 minutes to clear out any gas. If you then smell gas, stop and follow the gas safety steps. If not, move the switch to on, replace the panel, turn the power back on and set the thermostat; the burner may take 30 to 60 seconds to ignite. After three trials for ignition, if the furnace does not operate, turn it off by the steps above and call your service technician or gas supplier (1010352-UUM-O-0423, p. 4). In this edition step 6 refers to “Step 2 in the Safety information on page 1”; the steps for a gas smell are the block “What to do if you smell gas” on page 1, which has no step numbers (1010352-UUM-O-0423, pp. 1, 4).

Lockouts and clearing a code

The owner’s manuals for 33-inch furnaces describe no reset and do not mention lockouts. The installation manuals describe how the control behaves, for the installer:

  • A soft lockout resets itself after 1 hour. The manuals give a temporary interruption in the gas supply as the example: the control keeps trying to light each hour and resumes normal operation if the gas supply is restored (5750149-UIM-I-0423, p. 38).
  • A hard lockout requires power to the control to be turned off and back on, and the control does not restart by itself (5750149-UIM-I-0423, p. 38).
  • In the TM9V*C manual, 6, 7 and 8 red flashes come with a 1-hour lockout and a restart, 4 red flashes after five limit openings in one call for heat with a 1-hour soft lockout, and 5 and 11 red flashes with a hard lockout that is reset by cycling power “after the problem has been corrected” (5750149-UIM-I-0423, p. 38). The modulating YP9C-family manual gives a one-hour lockout for 7 and 8 red flashes and does not use the term hard lockout (5750151-UIM-G-0423, pp. 36–37).
  • The Y92V manual resets a soft lockout by turning the power to the control off and on or by letting the 1-hour lockout time expire, and a hard lockout by turning the power off and on (6553957-UIM-A-0626, pp. 93–94).

The DGAA and DGAH manual differs: its control resets from a lockout after 60 minutes for faults 1, 3, 4 and Steady On, and it says “DO NOT turn off furnace power as this action will clear the control’s memory of the fault.” (5165697-BUM-C-0818, p. 8). That warning is in the DGAA and DGAH manual only.

Every reset in the installation manuals comes after the problem has been corrected. These pages treat a code that returns after a reset as a reason to call a technician; the owner’s manual’s instruction for red flashes is to contact your dealer in any case (1010352-UUM-O-0423, p. 5).

When to stop and call a professional

The owner’s manual says installation and service must be performed by a qualified installer, service agency or the gas supplier (1010352-UUM-O-0423, p. 1). Stop and call when:

  • You smell gas. The steps from page 1 of the owner’s manual are at the top of every code page (1010352-UUM-O-0423, p. 1).
  • The furnace overheats or the gas valve fails to shut off. Turn the external manual gas valve to off and let the furnace cool before shutting off the electric power (6100761-UUM-C-1124, p. 8).
  • Any part of the furnace has been under water. The manual says not to use it and to contact a qualified service agency to inspect it and replace all gas controls, control system parts and electrical parts that have been wet (1010352-UUM-O-0423, p. 2).
  • The gas control switch does not move by hand (1010352-UUM-O-0423, p. 3).
  • The furnace does not operate after three trials for ignition (1010352-UUM-O-0423, p. 4).
  • The LED shows red flashes (1010352-UUM-O-0423, p. 5), or a code keeps coming back. The second is the advice of these pages.
  • The work goes past the external filters (1010352-UUM-O-0423, p. 5).

Carbon monoxide: the manual’s warning is at the top of every code page (1010352-UUM-O-0423, p. 1). It asks you to check that all openings in the outside wall around the vent and air intake pipes are sealed, and that the furnace vent and air intake terminals are not obstructed in any way during all seasons (1010352-UUM-O-0423, p. 1). In 6100761-UUM-C-1124 the same warning is introduced as applying to horizontally vented furnaces only (6100761-UUM-C-1124, p. 3).

See also

Other gas furnaces: Carrier, Goodman, Lennox, Rheem furnaces, Trane and American Standard

York, Coleman and Luxaire are trademarks of their owners. How House Works is not affiliated with or endorsed by York, Coleman and Luxaire.

Sources

42 documents
  1. Johnson Controls. USER'S INFORMATION MANUAL MODELS: All Residential Multi-position Gas Furnaces (33 in. Models). 1010352-UUM-O-0423. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  2. Johnson Controls. User's Information Manual: All Residential Multi-position Gas Furnaces - 33 in. Models. 6100761-UUM-C-1124. Accessed Oct 21, 2026.
  3. Johnson Controls. USER'S INFORMATION, MAINTENANCE AND SERVICE MANUAL SEALED COMBUSTION GAS FURNACE MODELS: DGAA and DGAH SERIES (Single Stage Downflow Only) For Installation In: 1.Manufactured (Mobile) Homes. 5165697-BUM-C-0818. Accessed Oct 21, 2026.
  4. Johnson Controls. USER'S INFORMATION MANUAL 33" MULTI-POSITION GAS FURNACES (Manufactured Housing or Modular Home Applications) MODELS: MM9E AND MG9S SERIES. 5165698-UUM-C-0519. Accessed Oct 21, 2026.
  5. JC Residential and Light Commercial LLC. User's Information Manual: All Residential Multi- Position Gas Furnaces - 33 in. Models. 6647854-UUM-B-0626. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  6. Johnson Controls. SINGLE STAGE ECM RESIDENTIAL GAS FURNACES MODELS: TM8X, TMLX (80% Multi-position/Standard & Low NOx) INSTALLATION MANUAL. 998492-UIM-C-1013. Accessed Oct 21, 2026.
  7. Johnson Controls. Single Stage ECM Residential Gas Furnaces Models: TM9E Series (95% AFUE Multi-position) INSTALLATION MANUAL. 6019630-UIM-F-0423. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  8. Johnson Controls. TWO STAGE PSC RESIDENTIAL GAS FURNACES MODELS: TM9T Series (96% AFUE Multi-position) INSTALLATION MANUAL. 1083286-UIM-A-0114. Accessed Oct 21, 2026.
  9. Johnson Controls. SINGLE STAGE PSC RESIDENTIAL GAS FURNACES MODELS: TG9S and GG9S Series (95.5% AFUE Multi-position) INSTALLATION MANUAL. 1083287-UIM-A-0114. Accessed Oct 21, 2026.
  10. Johnson Controls. SINGLE STAGE ECM RESIDENTIAL GAS FURNACES MODELS: TM9X Series (95.5% AFUE Multi-position) INSTALLATION MANUAL. 1083288-UIM-A-0114. Accessed Oct 21, 2026.
  11. Johnson Controls. Modulating ECM Residential Gas Furnaces Models: YP9C, CP9C, LP9C, TP9C Series (up to 98% AFUE Multi-position) INSTALLATION MANUAL. 5750151-UIM-G-0423. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  12. Johnson Controls. MODULATING PSC RESIDENTIAL GAS FURNACES MODELS: TM9M Series (97% AFUE Multi-position) INSTALLATION MANUAL. 1083293-UIM-A-0114. Accessed Oct 21, 2026.
  13. Johnson Controls. TWO STAGE VARIABLE SPEED ECM RESIDENTIAL GAS FURNACES MODELS: TM9V Series (96% AFUE Multi-position) INSTALLATION MANUAL. 1083294-UIM-A-0114. Accessed Oct 21, 2026.
  14. Johnson Controls. For Installation In: 1.Manufactured (Mobile) Homes 2.Recreational Vehicles & Park Models 3.Modular Homes & Buildings SEALED COMBUSTION GAS FURNACE MODELS: DGAX Single Stage - Downflow Only. 5483101-UIM-A-1118. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  15. Johnson Controls. Single Stage ECM Residential Gas Furnaces Models: RGF19*E Series (95% AFUE Multi-position) INSTALLATION MANUAL. 6019627-UIM-F-0423. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  16. Johnson Controls. Two Stage Standard ECM Residential Gas Furnaces Models: TM9Y Series (96% AFUE Multi-position) INSTALLATION MANUAL. 5750144-UIM-H-0423. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  17. Johnson Controls. Two-Stage Variable Speed ECM Residential Gas Furnaces Models: TM9V*C Series (96% AFUE Multi-position) INSTALLATION MANUAL. 5750149-UIM-I-0423. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  18. Johnson Controls. Two-Stage Variable Speed ECM Residential Gas Furnaces Models:TM8V*C, TMLV*C (80% AFUE Multi-position / Low NOx) INSTALLATION MANUAL. 5750148-UIM-D-0423. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  19. Johnson Controls. TWO STAGE PSC RESIDENTIAL GAS FURNACE MODELS MODELS: TM8T*MP, TMLT*MP 80% AFUE Multi-position / Low NOx INSTALLATION MANUAL. 995472-UIM-B-0713. Accessed Oct 21, 2026.
  20. Johnson Controls. SINGLE STAGE PSC RESIDENTIAL GAS FURNACES MODELS: TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP (80% AFUE Multi-position / Standard Low NOx) INSTALLATION MANUAL. 998491-UIM-B-1013. Accessed Oct 21, 2026.
  21. Johnson Controls. MODULATING ECM RESIDENTIAL GAS FURNACE MODELS: TPLC*C, YPLC*C, CPLC*C, LPLC*C (80% AFUE Multi-position / Low NOx) INSTALLATION MANUAL. 987158-UIM-B-1013. Accessed Oct 21, 2026.
  22. Johnson Controls. Installation Manual: RG19 Series - Condensing Single-Stage ECM Multi- Position Gas Furnace. 6125051-UIM-C-0624. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  23. Johnson Controls. Installation Manual: RL18 Single-Stage Standard ECM Residential Gas Furnaces (Non-condensing Multi-position Standard Low NOx). 6100760-UIM-C-1124. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  24. Johnson Controls. Installation Manual: Y81E Single-Stage Standard ECM Residential Gas Furnaces (Non-condensing Multi-position Standard and Low NOx). 6100757-UIM-C-1124. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  25. Johnson Controls. Installation Manual: Two-Stage Standard ECM Residential Gas Furnace Model: Y82E Non-Condensing Multi-Position/ Low-NOx Rev C. 6142403-UIM-C-1124. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  26. Johnson Controls. Installation Manual: Y91E Series - Condensing Single-Stage ECM Multi- Position Gas Furnace. 6125049-UIM-C-0624. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  27. Johnson Controls. Installation Manual: Y92E Series - Condensing Two-Stage Standard ECM Multi-position Gas Furnaces. 6154201-UIM-B-1224. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  28. JC Residential and Light Commercial LLC. Installation Manual: Y92V Series - Two- Stage Variable Speed ECM Gas Furnace - Multi-Position. 6553957-UIM-A-0626. File on yorknow.com, run by BHC Residential & Light Commercial LLC; YORK used under license from Johnson Controls. Accessed Oct 21, 2026.
  29. Johnson Controls. SINGLE STAGE ECM RESIDENTIAL GAS FURNACES MODELS: TM9E Series (95% AFUE Multi-position) INSTALLATION MANUAL. 1083163-UIM-A-0214. Accessed Oct 21, 2026.
  30. Johnson Controls. TWO STAGE VARIABLE SPEED ECM RESIDENTIAL GAS FURNACES MODELS:TM8V*C, TMLV*C (80% AFUE Multi-position / Low NOx) INSTALLATION MANUAL. 1034867-UIM-B-0913. Accessed Oct 21, 2026.
  31. Johnson Controls. When paired with a York heat pump MODULATING ECM RESIDENTIAL GAS FURNACES MODELS: TP9C, YP9C, CP9C, and LP9C Series (Up to 98% AFUE Multi-position) INSTALLATION MANUAL. 1083292-UIM-A-0114. Accessed Oct 21, 2026.
  32. Johnson Controls. Quick Reference Guide - 96% AFUE Two Stage Variable Speed Multi-Position 33" Gas Furnaces. 1083301-URG-A-0114. Accessed Oct 21, 2026.
  33. Johnson Controls. Quick Reference Guide - Up To 98% AFUE 33" Modulating ECM Multi-Position Gas Furnace. 1083298-URG-A-0114. Accessed Oct 21, 2026.
  34. Johnson Controls. Quick Reference Guide - 80% AFUE Two Stage PSC Multiposition 33" Gas Furnace. 521574-URG-B-0413. Accessed Oct 21, 2026.
  35. Johnson Controls. Quick Reference Guide - 80% AFUE Two Stage ECM Multi-Position Gas Furnace 33". 523354-URG-C-0513. Accessed Oct 21, 2026.
  36. Johnson Controls. Quick Reference Guide - 80% AFUE Single Stage Multi-Position 33" Gas Furnaces. 530287-URG-B-0413. Accessed Oct 21, 2026.
  37. Johnson Controls. Quick Reference Guide - 80% Modulating Gas-Fired Residential Multi-Position Gas Furnaces with ECM Motor (33” TALL). 535679-URG-B-0413. Accessed Oct 21, 2026.
  38. Johnson Controls. Quick Reference Guide - 80% AFUE Single Stage Multi-Position 33" Gas Furnaces. 1060926-URG-A-1013. Accessed Oct 21, 2026.
  39. Johnson Controls. Reference Guide - 95.5% AFUE Single-Stage Multi-Position 33" Gas Furnaces. 1083295-URG-A-0114. Accessed Oct 21, 2026.
  40. Johnson Controls. Quick Reference Guide - 96% AFUE Two Stage Multi-Position 33" Gas Furnaces. 1083297-URG-A-0114. Accessed Oct 21, 2026.
  41. Johnson Controls. Quick Reference Guide - 95.0% AFUE Single-Stage Multi-Position 33" Gas Furnaces. 1104909-URG-A-0214. Accessed Oct 21, 2026.
  42. Johnson Controls. Quick Reference Guide - 95.5% AFUE Single-Stage Multi-Position 33" Gas Furnaces. 1083300-URG-A-0114. Accessed Oct 21, 2026.