37 / E37
Indicates the control board may need to be replaced
This code typically points to
- Outdoor fan motor not connected properly
- Faulty control board
Next checks to confirm
- Check wiring from outdoor fan motor to control board
- Repair if needed
- Replace control board if necessary
Escalation
Outdoor fault indication
Reset behavior
Clears after wiring/board issue is corrected.
Urgent
Fix now