1+3
Flame sensed out of sequence — flame still present
This code typically points to
- Leaking gas valve
- False flame signal
- Shorted sense path
Next checks to confirm
- Confirm burner is actually off
- Verify flame is not present with valve de-energized
- Check gas valve shutoff integrity
- Inspect sense circuit and grounding
Escalation
Faulted state until abnormal flame condition is gone
Reset behavior
Clears after abnormal flame condition is removed.
Safety Critical
Immediate concern