Indoor unit displays P0 and system may not start or may run at reduced capacity.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Safety first: This is a high-voltage inverter fault. Turn off power at the disconnect and do not attempt board-level repairs unless qualified.
User checks:
- Verify supply: Have a qualified person confirm that line voltage is within the range specified on the outdoor unit nameplate.
- Inspect wiring: With power OFF, check for loose lugs or burnt wires in the outdoor electrical compartment.
Professional repair: P0 typically requires an HVAC technician to diagnose the outdoor inverter control board, DC bus, and compressor. Board or compressor replacement may be necessary.
Repair Difficulty
Required Part
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