F4
Senville
Compressor Discharge Temperature Sensor (Alternate Code) Fault
Indoor unit displays F4; 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
Open or shorted discharge sensor, Sensor detached from discharge line, Damaged sensor wiring, Faulty outdoor PCB sensor circuit
How to Fix / Troubleshooting
Safety: Disconnect power before opening the outdoor unit.
- Step 1 – Locate discharge sensor: Find the sensor attached to the small copper line leaving the compressor.
- Step 2 – Inspect and reattach: Ensure it is firmly in contact with the line and secured with clip or strap.
- Step 3 – Check wiring: Inspect for cuts or burns and reseat the connector on the PCB.
- Step 4 – Replace sensor: If damaged or if F4 persists, replace with the correct Senville discharge sensor.
- Step 5 – PCB evaluation: If a new sensor does not resolve the issue, the outdoor PCB may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Discharge Pipe Temperature Sensor (T3)
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