ERR154.00
EH airflow limit fault / EH OFF/NO AF
This code typically points to
- Electric heat control locked out because minimum airflow request has not been met
- Low airflow
- Dirty coil/filter
- Airflow below required minimum
Next checks to confirm
- Verify external static / airflow table against minimum airflow requirement
- Check for low airflow conditions
Escalation
Critical — EHC locked out
Reset behavior
Public alert-code snippet says cycle power to air handler to clear the alert.
Safety Critical
Immediate concern