P1
Westinghouse
Abnormal Input Voltage Protection
Display shows P1 and unit stops; often related to low or high AC line voltage.
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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 supply voltage, high supply voltage, loose neutral or line connection, undersized wiring, faulty voltage detection circuit on PCB
How to Fix / Troubleshooting
Safety: Turn off power before inspecting electrical connections.
Steps:
- Measure line voltage: Have a qualified person measure the supply voltage at the unit. It must be within the range specified on the nameplate.
- Check connections: Inspect the terminal block for loose screws, discoloration, or burnt insulation. Tighten as needed.
- Correct wiring size: Ensure the circuit wire gauge and breaker size meet Westinghouse installation requirements.
- Utility issues: If supply voltage is unstable, contact your power utility.
- PCB fault: If voltage is normal but P1 persists, the PCB voltage detection circuit may be faulty and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Power Input Terminal Block
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