P0
Hisense
DC Bus Voltage Protection
Indoor unit displays P0 and the unit may not start or may run at reduced power.
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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.
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Possible Causes
Low or high AC supply voltage, Faulty PFC (power factor correction) circuit, Failing DC bus capacitors, Loose power wiring
How to Fix / Troubleshooting
Safety first: High DC voltages are present on the inverter board. Only qualified personnel should measure internal voltages.
- Step 1 – Check supply voltage:
- Have an electrician verify that the mains voltage is within the range specified on the unit rating plate.
- Step 2 – Inspect power connections:
- With power off, tighten all power terminal screws at the outdoor unit.
- Step 3 – Avoid unstable power sources:
- Do not run the unit from undersized generators or unstable inverters.
- Step 4 – Technician repair: If P0 persists with correct supply, the inverter board (DC bus capacitors or PFC circuit) likely needs replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Inverter Control Board
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