P1
Hisense
High or Low Voltage Protection
Indoor unit displays P1 and the unit may shut down during operation.
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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
Mains voltage outside allowable range, Loose neutral or ground connection, Undersized wiring causing voltage drop, Faulty voltage detection circuit on PCB
How to Fix / Troubleshooting
Safety first: Voltage issues can damage equipment and pose shock hazards. Use a qualified electrician.
- Step 1 – Measure supply voltage:
- Have an electrician check voltage at the unit during operation.
- Step 2 – Inspect wiring size and length:
- Ensure the cable gauge and run length meet Hisense installation requirements.
- Step 3 – Correct power issues:
- Fix loose connections, upgrade wiring, or stabilize supply as needed.
- Step 4 – PCB check: If voltage is stable but P1 remains, the PCB voltage sensing circuit may be faulty and should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Main Control Board (PCB)
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