50 / E50
Voltage issue on control board; see service manual for troubleshooting information
This code typically points to
- High or low voltage from supply voltage or frequency
- Faulty control board
- Noise
Next checks to confirm
- Correct low/high line-voltage condition
- Contact local utility if needed
- Replace control board if necessary
Escalation
Outdoor control-board protection fault
Reset behavior
Clears after supply/board issue is corrected.
Urgent
Fix now