ERR153.00
Thermal limit switch fault / EH CTCO TRIP
This code typically points to
- Low airflow
- Dirty coil/filter
- Cycling thermal cut-out (CTCO) trip has occurred
Next checks to confirm
- Check airflow, coil, filter
- Inspect electric-heat thermal cutout chain
Escalation
Normal / trip event noted in public alert guide
Reset behavior
Public alert-guide snippet says cycle power to clear this alert.
Urgent
Fix now