P0
Sharp
DC Bus Voltage Protection / Inverter Power Supply Fault
Unit does not start; P0 displayed on indoor unit.
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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 mains voltage, Failed PFC circuit or rectifier on outdoor PCB, Loose power wiring, Swollen or failed DC bus capacitors
How to Fix / Troubleshooting
Safety first: Inverter DC bus circuits can retain lethal voltages even after power is off. Only qualified personnel should service these components.
- Check supply voltage: Have a qualified person verify that the mains voltage is within Sharp’s specified range.
- Inspect wiring: With power off, check that all power terminals are tight and that there are no burnt or discolored wires.
- Visual PCB inspection: Look for swollen capacitors, burnt components, or cracked solder joints on the outdoor PCB.
- PCB replacement: If P0 persists and supply voltage is correct, the outdoor inverter PCB likely needs replacement by an authorized Sharp technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Inverter Power PCB
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