P0
Midea DC Bus Voltage Protection / Inverter Power Supply Fault

Unit displays P0; compressor may not start or may run at reduced capacity

Advertisements

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.

Advertisements

Possible Causes

Low or high AC supply voltage, Faulty PFC (power factor correction) circuit, Loose power connections, Defective inverter PCB

How to Fix / Troubleshooting

Safety first: High DC voltage is present on the inverter. Only visual checks should be done by non-professionals.

Steps to check:

  • 1. Verify supply voltage: Ensure the AC supply is stable and within the range specified on the nameplate. Avoid using undersized extension cords.
  • 2. Check dedicated circuit: The air conditioner should be on its own circuit. Remove other heavy loads from the same circuit.
  • 3. Inspect terminals: With power OFF, check that main power terminals in the outdoor unit are tight and not burnt.

When to call a technician: Persistent P0 indicates an inverter power issue. A technician should test DC bus voltage, PFC operation, and replace the inverter PCB if necessary.

Advertisements

Repair Difficulty

Professional Required 5/5

Required Part

Outdoor Inverter PCB
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements