4 flashes
Lockout due to failed ignition
This code typically points to
- No gas
- Igniter issue
- Flame-proving failure
- Gas valve issue
Next checks to confirm
- Verify igniter and gas supply
- Verify flame prove on attempted ignition
- Inspect burner carryover
Escalation
Repeated lockout after ignition hardware checks points to valve or control issues.
Reset behavior
Power cycle to reset after correction.
Urgent
Fix now