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Trane and American Standard furnace E11: internal gas valve error

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HHW · ERROR-CODES · TRANE · E11
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Trane installation, operation and maintenance documents

Short answer On Trane and American Standard S-Series and L8V1 furnaces, E11 means a gas valve relay is stuck or the gas valve is energized at the wrong time. If the gas does not shut off, close the manual gas valve; the rest is technician work. See what to check

Furnace control LED or display

E11

“(1) 1st stage gas valve not energized when it should be (2) 1st stage gas valve relay stuck closed (3) 2nd stage gas valve relay stuck closed (S8X2 only) (4) 2nd stage gas valve energized when it should not be (S8X2 only) (5) 2nd stage gas valve not energized when it should be (S8X2 only)”

Technician

S8B1, S8X1, S8X2 · Upflow/Downflow/Horizontal Gas-Fired, 1-Stage and 2-Stage Induced Draft Furnaces with High Efficiency Motor, p. 58

What it means

E11 reports a fault in the gas valve circuit of the furnace control: the gas valve is not energized when it should be, is energized when it should not be, or a gas valve relay is stuck closed. The L8V1, S9VM and S9V2 Link kit tables group it as “Internal Gas Valve Error” (FNR-SVX007A-EN, p. 43; FNR-SVX006B-EN, p. 106; FNR-SVN001A-EN, p. 46), and the S9X and S8V2-C troubleshooting charts define it as the control detecting that its internal gas valve relays have failed (FNR-SVX002B-EN, p. 111; FNR-SVX003A-EN, p. 76).

The list of conditions differs by series:

Series What the table lists under E11 Source
S9X1, S9X2, S9B1 five conditions: the 1st stage gas valve not energized when it should be; the 1st or 2nd stage gas valve relay stuck closed; the 2nd stage gas valve energized when it should not be, or not energized when it should be. The 2nd stage items are “Not applicable for S9X1/S9B1” FNR-SVX002B-EN, p. 98
S8B1, S8X1, S8X2 the same five; the 2nd stage items are “Not Applicable for S8B1, S8X1” S8XB-SVX001-1D-EN, p. 59
S8B1, 2020 guide “Gas valve not energized when it should be Gas valve relay stuck closed” 18-CE09D1-1E-EN, p. 54
S8V2-C four conditions: the 1st stage gas valve not energized when it should be; the 2nd stage gas valve energized without request, or not energized when it should be; a gas valve relay stuck closed FNR-SVX003A-EN, p. 59
L8V1 the 1st stage gas valve energized when it should not be, or not energized when it should be; the redundant relay (HLO output) not energized when it should be. “After 10 unsuccessful tries, E11 will populate and enter into a one hour lockout” FNR-SVX007A-EN, p. 43
S9V2-VC (Link kit) six conditions about 24 volts present or missing at the gas valve and HLO outputs, and a gas valve relay stuck closed FNR-SVN001A-EN, p. 46
S9VM split into E11.1 to E11.4 (see the notes) FNR-SVX006B-EN, p. 106

Check these first

The owner’s information (32-5083-1C-EN) has no code list and no step for E11. For a gas supply that fails to shut off, it says to shut off the manual gas valve to the furnace before shutting off the electrical supply, and asks you to have your installer or servicer show you where that valve is (32-5083-1C-EN, p. 2).

Its troubleshooting table goes by symptom and does not mention codes. The rows an owner can act on, in the table’s order:

  1. Check that the thermostat is set correctly (32-5083-1C-EN, p. 3).
  2. For a blown fuse or tripped circuit breaker: “Replace or reset protective device or call for servicer.” (32-5083-1C-EN, p. 3).
  3. If the main gas line is turned off: “Have gas company check.” (32-5083-1C-EN, p. 3).
  4. Make sure the blower door is closed securely; the table says this restores power to the blower and gas valve (32-5083-1C-EN, p. 3).
  5. For heat that is not enough while the blower runs all the time: clean or replace dirty air filters, and make sure the supply and return registers are open with nothing blocking the air (32-5083-1C-EN, p. 3).
  6. For no heat while the vent motor runs: make sure the vent terminals are not blocked; a restricted or plugged condensate drain is for a servicer (32-5083-1C-EN, p. 3).

If the furnace still will not operate, turn off the gas to the unit and call your service technician or gas supplier (32-5083-1C-EN, p. 2). The steps turn off all electric power before the front panel comes off (32-5083-1C-EN, p. 3): turning off the gas.

The list is the same on every code page, and these pages do not present it as a fix for E11. On the L8V1, the table gives a one hour lockout only for its third E11 condition, the redundant relay and HLO output: “After 10 unsuccessful tries, E11 will populate and enter into a one hour lockout” (FNR-SVX007A-EN, p. 43).

When to call a licensed technician

The actions in the tables are written for the technician:

  • On the L8V1: verify that all wiring is correct and intact, then replace the control (FNR-SVX007A-EN, p. 43).
  • On the S9VM, by sub-code: for the first E11.1 row the control has failed and is replaced; for the second, the wiring to MVH is checked for shorts before the control is replaced; for E11.2, the wiring and the communication voltages between the gas valve and the control are checked; for E11.3 and E11.4, the table starts with cycling the furnace power and retrying (for E11.4 also resetting the gas valve offsets to zero), then replacing the valve, then the control, if the problem persists (FNR-SVX006B-EN, p. 106).
  • E11 keeps coming back. The owner’s information gives no step for codes; these pages send it to the technician.

The owner’s information says that apart from the simple maintenance it describes, you should not attempt any adjustments or repairs (32-5083-1C-EN, p. 3).

Notes for different models
Series or board Code or LED state Wording Source
S9VM E11.1 “1st Stage Gas Valve Not Energized When It Should Be Redundant Relay (HLO Output) not Energized when it should be”; a second E11.1 row: “Gas Valve Relay stuck closed” FNR-SVX006B-EN, p. 106
S9VM E11.2 “Communication is lost between the gas valve and the furnace control” FNR-SVX006B-EN, p. 106
S9VM E11.3, E11.4 “The gas valve is responding with incorrect position information.”; “The gas valve is responding with the incorrect offset information” FNR-SVX006B-EN, p. 106
LED boards 7 flashes “Gas valve circuit error” 18-CD19D5-35-EN, p. 40; 18-CD19D8-20, p. 37
*UX2/*DX2, *UD2 red LED solid “Internal GV error or Low TH voltage” 18-CD19D8-20, p. 37; 18-CD24D1-6, p. 28
*UH3/*DH3, *UHM/*DHM Fault LED solid on, INT GV ERR alert code 93, group “Gas Valve Fault” 18-CD30D1-21-EN, p. 55; 18-CD23D1-9, p. 51

The S9VM table prints E11.1 twice, with two different communication codes, ERR.093.02 and ERR.093.04 (FNR-SVX006B-EN, p. 106). Related display codes on the same tables: E2.3, the 1st stage gas valve not energized when it should be, exceeded after 10 times; E7.1, the 1st stage gas valve energized when it should be off (S8XB-SVX001-1D-EN, pp. 58–59). The documents do not translate flash counts into display codes.

Related Trane and American Standard codes

  • E2.3 “1st Stage Gas Valve Not Energized When It Should Be exceeded after 10 times”
  • E7.1 “1st stage gas valve (MVL) is energized when it should be off”
  • E7.2 “Redundant Relay (HLO output) Energized when it should be Off”

See also

Other gas furnaces: Carrier, Goodman, Lennox, Rheem furnaces, York, Coleman and Luxaire

All Trane and American Standard codes

Trane and American Standard are trademarks of their owners. How House Works is not affiliated with or endorsed by Trane and American Standard.

Sources

14 documents
  1. Trane Technologies. Gas Heating Systems - Owner's Information. 32-5083-1C-EN, © 2024. Accessed Oct 21, 2026.
  2. Trane Technologies. Upflow/Horizontal and Downflow/Horizontal Gas-Fired Condensing furnaces. 18-CD19D5-35-EN, 02/19. Accessed Oct 21, 2026.
  3. Trane Technologies. Upflow/Horizontal & Downflow/Horizontal, Gas-Fired, Direct Vent, 2-Stage Condensing Furnaces with Variable Speed Inducer. 18-CD19D8-20, 12/11. Accessed Oct 21, 2026.
  4. Trane Technologies. Variable Speed, 2-Stage, 80% Upflow/Horizontal Gas-Fired Furnaces, "Fan Assisted Combustion System" with Whole House Air Cleaner. 18-CD24D1-6, 02/11. Accessed Oct 21, 2026.
  5. Trane Technologies. Upflow/Horizontal and Downflow/Horizontal, Gas-Fired, Direct Vent, Variable Speed Inducer, Modulating Condensing Communicating furnaces. 18-CD30D1-21-EN, no revision date printed (eLibrary file dated September 2023). Accessed Oct 21, 2026.
  6. Trane Technologies. Upflow/Horizontal and Downflow/Horizontal, Gas-Fired, Direct Vent, Variable Speed Inducer, 3-Stage Condensing Communicating Furnaces. 18-CD23D1-9, 02/11. Accessed Oct 21, 2026.
  7. Trane Technologies. Upflow/Horizontal and Dedicated Downflow Gas-Fired, Direct/Non-Direct Vent, Single Stage / Two Stage Condensing Furnaces with High Efficiency Motor. FNR-SVX002B-EN, August 2026. Accessed Oct 21, 2026.
  8. Trane Technologies. Upflow/Downflow/Horizontal Gas-Fired, 1-Stage and 2-Stage Induced Draft Furnaces with High Efficiency Motor. S8XB-SVX001-1D-EN, August 2024. Accessed Oct 21, 2026.
  9. Trane Technologies. Link Communicating or 24 Volt Gas-Fired 2 Stage Induced Draft Furnaces with Variable Speed Motor. FNR-SVX003A-EN, October 2025. Accessed Oct 21, 2026.
  10. Trane Technologies. Upflow/Horizontal Left/Right Gas-Fired, Single Stage Induced Draft Furnace with Variable Speed Blower Motor (natural gas only). FNR-SVX007A-EN, April 2026. Accessed Oct 21, 2026.
  11. Trane Technologies. Upflow/Horizontal and Dedicated Downflow Gas-Fired, Direct/Non-Direct Vent, Modulating Condensing Variable Speed Furnaces with Variable Speed Draft Inducer. FNR-SVX006B-EN, October 2026. Accessed Oct 21, 2026.
  12. Trane Technologies. BACS9V2CA22MUAA kit: converts an S9V2-VS revision B or later furnace to a Link Communicating furnace (S9V2-VC). FNR-SVN001A-EN, October 2025. Accessed Oct 21, 2026.
  13. Trane Technologies. Upflow/Downflow/Horizontal Left/Right Gas-Fired, Single Stage Induced Draft Furnaces with High Efficiency Motor. 18-CE09D1-1E-EN, May 2020. Accessed Oct 21, 2026.
  14. Trane Technologies. Upflow/Downflow/Horizontal Gas-Fired, 1-Stage and 2-Stage Induced Draft Furnaces with High Efficiency Motor. 18-CE14D1-1A-EN, March 2020. Accessed Oct 21, 2026.