American Standard Furnace Code E11
Safety fault
Gas valve relay fault. The control has found the gas valve output in the wrong state - either not energizing when commanded, or a relay stuck closed.
Manual wording: “Gas valve not energized when it should be / Gas valve relay stuck closed”
Documented for: A951X condensing and A801X induced draft furnaces with the seven-segment IFC display
Likely causes, most common first
- Gas valve not energized when it should be
- Gas valve relay stuck closed
What you can safely check yourself
- Turn the furnace switch off and leave it off until a technician has looked at it
When to call a technician
Call a technician. A stuck gas valve relay is a safety fault and normally means replacing the integrated furnace control.
A American Standard furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- Installer's Guide - Upflow/Horizontal and Dedicated Downflow Gas-Fired, Direct/Non-Direct Vent, Single Stage Condensing Furnaces with High Efficiency Motor (88-A951X001-1D-EN) (American Standard Heating and Air Conditioning, A951X040BU3SAB through A951X120DD5SAB single-stage 95% condensing furnaces (Silver 95 family)) · checked 2026-08-25
- Installer's Guide - Upflow/Downflow/Horizontal Left/Right Gas-Fired, Single Stage Induced Draft Furnaces with High Efficiency Motor (88-A801X003-1C-EN) (American Standard Heating and Air Conditioning, A801X026AM2SC through A801X120DM5SC single-stage 80% induced draft furnaces (Silver 80 family)) · checked 2026-08-25