P0
Airwell
DC Bus Voltage Protection
Indoor unit displays P0; unit may not start or may shut down; often indicates DC bus voltage or power issue.
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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
Incorrect supply voltage, Loose power connections, Failed PFC (power factor correction) circuit, Faulty inverter PCB capacitors
How to Fix / Troubleshooting
Safety: High DC bus voltages are lethal. Only qualified personnel should test live circuits. Always isolate power before inspection.
Steps:
- 1. Verify supply voltage: Have a qualified electrician confirm that the supply voltage matches the Airwell unit's rating.
- 2. Inspect terminals: With power OFF, check that all power terminals in the outdoor unit are tight and free of corrosion.
- 3. Visual PCB check: Look for bulging or leaking capacitors and burnt components on the inverter PCB.
- 4. Professional repair: DC bus faults require PCB repair or replacement by an authorized technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Inverter PCB (DC Bus Section)
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