Chigo DC Bus Voltage Protection (Too High or Too Low)

Indoor unit shows P0 and the compressor does not start or runs at limited 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

Unstable mains voltage to Chigo outdoor unit, Faulty PFC (power factor correction) circuit on outdoor PCB, Loose power connections, Oversized generator or inverter power source causing voltage spikes

How to Fix / Troubleshooting

Safety first: Only qualified personnel should measure live voltages.

Step 1 – Check power source: Ensure the AC is connected to a stable mains supply, not an undersized generator.
Step 2 – Inspect terminals: With power off, tighten all power terminals in the outdoor unit and main disconnect.
Step 3 – Professional diagnosis: A technician should measure DC bus voltage on the outdoor PCB and verify the PFC circuit. If defective, replace the outdoor main PCB.

Repair Difficulty

Professional Required 5/5

Required Part

Outdoor Main PCB

Check Price on Amazon

We may earn a commission from links on this page.