e11
Gas valve relay/control fault — 5 branches: (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, (4) 2nd stage gas valve energized when it should not be, (5) 2nd stage gas valve not energized when it should be
This code typically points to
- Gas-valve relay fault on 1st or 2nd stage
- Gas-valve control circuit fault
Next checks to confirm
- Verify gas valve wiring to schematic
- Test both 1st and 2nd stage gas-valve relays on board
- Verify no shorts or backfeed in gas-valve circuit
Escalation
Gas-valve/control safety fault
Reset behavior
Clears when valve/control fault corrected. Historical entry remains in L6F until cleared.
Safety Critical
Immediate concern