F4
Chigo
Compressor Discharge Temperature Sensor Fault
Indoor unit displays F4 and compressor operation is inhibited or intermittent.
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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
Failed discharge NTC sensor on Chigo compressor, Sensor detached from discharge line, Damaged sensor wiring harness
How to Fix / Troubleshooting
Safety first: Turn off power and wait for the compressor to cool before touching any piping.
- Step 1 – Locate discharge sensor: It is usually strapped or clipped to the small-diameter discharge pipe leaving the compressor.
- Step 2 – Inspect mounting and wiring: Ensure the sensor is firmly attached and that insulation is intact. Repair any damaged insulation.
- Step 3 – Measure resistance: Disconnect the sensor from the outdoor PCB and check resistance. Compare to the Chigo chart. Replace if open, shorted, or out of range.
- Step 4 – Replace sensor: Install a new compressor discharge temperature sensor and secure it with the original clip or strap.
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Repair Difficulty
Medium
3/5
Required Part
Discharge Temperature Sensor
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