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error Miller
Error Code HELP-21
Voltage or current feedback has been detected while the contactor is off, suggesting a malfunction in the internal PID board.
? What Causes This
Internal PID board malfunction or false voltage/current feedback signal detection.
✓ How to Fix It
- Turn off the unit and allow it to cool.
- Check all internal connections to PID board.
- Reset to factory defaults if possible.
- Contact Miller service technician for PID board diagnosis or replacement.