P4
Senville
Inverter Module Temperature Protection
Indoor unit shows P4; compressor may not start or may shut down quickly.
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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
Blocked airflow through outdoor electronics compartment, Failed inverter module temperature sensor, Dirty or non-functioning outdoor fan, Faulty outdoor PCB
How to Fix / Troubleshooting
Safety: Disconnect power before opening the outdoor unit.
- Step 1 – Clean vents: Ensure the outdoor unit's electronics compartment vents are not blocked by dirt or debris.
- Step 2 – Check outdoor fan: Confirm the fan is moving sufficient air across the coil and electronics.
- Step 3 – Inspect sensor: Locate the inverter heat sink temperature sensor and ensure it is properly attached.
- Step 4 – Replace sensor or PCB: If the sensor is faulty or if P4 persists, a technician may need to replace the sensor or entire PCB.
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Repair Difficulty
Hard
4/5
Required Part
Inverter Heat Sink Temperature Sensor
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