33
Rollout / overtemperature family on this generation (shared diagnostic path with 22 and 23)
This code typically points to
- Rollout safety tripped
- Overtemperature condition
- Blocked flue or heat exchanger
Next checks to confirm
- Inspect rollout and manual-reset safeties
- Check flue and heat exchanger
- Public snippet says: if inducer does not stop, expect 22 or 33
Escalation
Safety interruption during heating
Reset behavior
Correct cause and reset applicable safeties.
Safety Critical
Immediate concern