22
Main limit / manual-reset overtemperature / rollout family on this generation (shared diagnostic path with 23 and 33)
This code typically points to
- Manual reset overtemperature control tripped
- Wire loose in limit circuit
- Open main limit safety
Next checks to confirm
- Check overtemperature switches and wiring
- Public snippet specifically says: if inducer does not stop, expect 22 or 33; if blower does not stop, expect 22, 23, or 33
Escalation
Safety interruption during heating
Reset behavior
Correct cause; reset manual-reset controls where applicable.
Safety Critical
Immediate concern