E274
Soft lockout — exceeded recycles; last recycle failed due to limit opening or limit open >3 minutes
This code typically points to
- Airflow restriction
- Overfiring
- Blockage
Next checks to confirm
- Shut system down
- Check firing rate and airflow
- Check for blockage
Escalation
1-hour soft lockout
Reset behavior
Clears when heat call finishes successfully.
Safety Critical
Immediate concern