York furnace 1 red flash: flame with no call for heat (Coleman, Luxaire)

Short answer On York, Coleman and Luxaire furnaces, 1 red flash means the control sensed flame with no call for heat; the manuals point to a leaking or slow-closing gas valve. That is technician work; if you smell gas, follow the gas safety steps on this page. See what to check

Furnace control LED

1 red flash

“Flame present with gas off”

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

The lamp blinks 1 time, then pauses. It shows the count only; the timing on your board may differ.

What it means

On York, Coleman and Luxaire furnaces, 1 red flash means the control sensed flame when there was no call for heat. The control turns on both the inducer motor and the supply air blower, and the installation manuals point to a leaking or slow-closing gas valve (5750149-UIM-I-0423, p. 37; 6125049-UIM-C-0624, p. 49; 6553957-UIM-A-0626, p. 87).

The modulating YP9C, CP9C, LP9C, TP9C, TM9M and TPLC-family manuals put it as flame present with no power being supplied to the gas valve, which can be caused by a gas valve that is slow to close or that leaks gas through to the burners (5750151-UIM-G-0423, p. 36; 987158-UIM-B-1013, p. 30).

The label printed with the wiring diagram reads “Flame present with gas off” on most series and “FLAME PRESENT WITH GV OFF” on the Y81E, RL18, Y82E, Y91E, RG19, Y92E and Y92V; the Y92V display shows 01 (5750149-UIM-I-0423, p. 40; 6100757-UIM-C-1124, p. 62; 6553957-UIM-A-0626, p. 96). In the Y92V wiring-diagram legend GV is the gas valve (6553957-UIM-A-0626, p. 96).

One flash means something else on the DGAA and DGAH furnaces for manufactured homes: their owner’s manual lists 1 flash of a green LED as “Ignition failure.” (5165697-BUM-C-0818, p. 8).

Check these first

The owner’s manuals 1010352-UUM-O-0423 and 6100761-UUM-C-1124 have no entry for 1 red flash. 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).

The installation manuals tie this code to the gas valve. The owner’s manuals do not mention 1 red flash and do not say what an owner should do for it. If you smell gas, follow the steps at the top of this page.

For a furnace that is not operating correctly, the manual lists visual checks to make before calling. 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).

When to call a licensed technician

• The gas valve: the installation manuals’ check is for a leaking or slow-closing valve (5750149-UIM-I-0423, p. 37; 5750151-UIM-G-0423, p. 36).
• Any service on the gas parts. 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), and that the user must not purchase, install, or replace any components of the furnace (1010352-UUM-O-0423, p. 5).

Call as well if 1 red flash comes 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; TM9X; TM9E (2014 and 2023); RGF19*E; TM8T*MP, TMLT*MP; TG8S*MP, TGLS*MP, GG8S*MP, GGLS*MP; TM8X, TMLX	“Flame present with gas off”	Flame sensed with no call for heat; the control turns on the inducer and the supply air blower; check for a leaking or slow-closing gas valve	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; 1083288-UIM-A-0114, pp. 36, 38; 1083163-UIM-A-0214, pp. 36, 38; 6019630-UIM-F-0423, pp. 33, 36; 6019627-UIM-F-0423, pp. 33, 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	“FLAME PRESENT WITH GV OFF”	Same	6100757-UIM-C-1124, pp. 57, 62; 6100760-UIM-C-1124, pp. 57, 62; 6142403-UIM-C-1124, pp. 58, 63; 6125049-UIM-C-0624, pp. 49, 52; 6125051-UIM-C-0624, pp. 49, 52; 6154201-UIM-B-1224, pp. 77, 82
Y92V	“FLAME PRESENT WITH GV OFF”, display 01	Same	6553957-UIM-A-0626, pp. 87, 96
YP9C, CP9C, LP9C, TP9C; TM9M; TPLC*C, YPLC*C, CPLC*C, LPLC*C	“Flame present with gas off”	Flame present with no power to the gas valve; a gas valve slow to close or leaking gas through to the burners	5750151-UIM-G-0423, pp. 36, 39; 1083292-UIM-A-0114, pp. 41, 43; 1083293-UIM-A-0114, pp. 39, 41; 987158-UIM-B-1013, pp. 30, 32
DGAX	“Flame present with gas off”	No text; label only	5483101-UIM-A-1118, p. 29
DGAA, DGAH (owner’s manual, green LED)	1 FLASH	“Ignition failure.”	5165697-BUM-C-0818, p. 8

A separate code covers the gas valve itself: 10 red flashes means the gas valve is energized with no call for heat, and the main blower and inducer run with no ignition sequence while that lasts (5750149-UIM-I-0423, p. 38). On the modulating furnaces 10 red flashes is “Gas valve circuit shorted.” (5750151-UIM-G-0423, p. 37).

Related York, Coleman and Luxaire codes

• 10 red flashes “Gas valve shorted "ON"”
• 8 red flashes “Loss of flame during call for heat”

See also

• Heat pump vs gas calculator
• Furnace and HVAC tax credits for 2025 and 2026: 25C ended after 2025
• Form 5695 for 2025 and 2026: QMID, lines, carryforward
• How a gas furnace lights, and how the control board blinks a failure code
• Home maintenance schedule from the manuals: monthly to yearly
• Winter home maintenance checklist: furnace, boiler, water heater
• Water heater or furnace closet: clearance and air requirements

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

All York, Coleman and Luxaire codes

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