5 Flashes
Flame sensed out of sequence
This code typically points to
- Gas valve leaking/stuck
- False flame signal
- Contaminated flame rod or grounding issues can contribute
Next checks to confirm
- Verify flame is not present with valve de-energized
- Inspect flame-sense circuit and gas valve behavior
Escalation
Escalate quickly because false flame can mask unsafe gas-valve faults.
Reset behavior
Clears when abnormal flame signal is removed.
Safety Critical
Immediate concern