8
Gas heating lockout
This code typically points to
- Stuck-closed gas valve relay on control
- Miswire/short to gas valve wire
Next checks to confirm
- Verify valve not being backfed or miswired
- Verify control relay state
Escalation
Hard safety/electrical isolation issue.
Reset behavior
Does not auto-reset; power off and wait 5 minutes to retry.
Safety Critical
Immediate concern