American Standard S8X1 furnace code E11: Gas valve relay fault
Professional repair
What does E11 mean on an American Standard Silver S8X1 gas furnace display? On the S8X1, E11 means the first-stage gas valve was not energized when it should have been, or the first-stage valve relay is stuck closed. Second-stage conditions in the chart do not apply.
This condition involves the gas or combustion side. If you smell gas or a CO alarm sounds: leave, then call your gas utility. Diagnostic info here is reference — combustion repairs are for licensed technicians. All six emergency signs →
A qualified technician tests the control's valve relay and circuit. A relay stuck closed is a gas-control safety concern, so the furnace should stay off until checked.
Possible causes
- First-stage gas valve relay on the control stuck closed TECH
- First-stage valve not receiving power when heat requires it TECH
Parts for this code
No model-verified part number is listed here. Have the fault diagnosed and the correct part matched to your furnace before ordering.
Questions about this code
What does E11 mean on an American Standard Silver S8X1 gas furnace display?
On the S8X1, E11 means the first-stage gas valve was not energized when it should have been, or the first-stage valve relay is stuck closed. Second-stage conditions in the chart do not apply.
How do I fix American Standard S8X1 furnace code E11?
If there is gas odor or a CO alarm, leave without operating switches and call emergency services from outside. Otherwise keep the furnace off and arrange diagnosis of the relay and valve circuit. Do not restart it to test.
How much does it cost to fix American Standard S8X1 furnace code E11?
Cost depends on whether the fault is in the control relay or the valve circuit. A confirmed control fault means a matched OEM board plus fitting labor.
Applies to
S8X1A040M3PSCA · S8X1B040M2PSCA · S8X1B060M4PSCB · S8X1B080M4PSCB · S8X1C080M5PSCA · S8X1C100M5PSCB · S8X1D120M5PSCA
Different American Standard generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Verified against Installation, Operation, and Maintenance — Upflow/Downflow/Horizontal Gas-Fired,1–Stage and2–Stage Induced Draft Furnaces with High Efficiency Motor, p.59
Verified against Installation, Operation, and Maintenance — Upflow/Downflow/Horizontal Gas-Fired,1–Stage and2–Stage Induced Draft Furnaces with High Efficiency Motor, p.76
Verified against Installer’s Guide — Upflow/Downflow/Horizontal Gas-Fired,1–Stage and2–Stage Induced Draft Furnaces with High Efficiency Motor, p.58
Last verified 2026-10-07 · page updated 2026-10-07 · how we verify
Related American Standard furnace codes
These codes use the same american standard silver s8x1 furnace control display (2024 iom) system.