F4
Arctic King
Compressor Discharge Sensor Error (Alternate Code)
Display shows F4; unit may shut down or run only in fan mode.
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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
Defective discharge thermistor, Sensor detached from discharge line, Damaged harness, Faulty main PCB
How to Fix / Troubleshooting
Safety: Unplug the unit and allow the compressor to cool before working near it.
Steps to fix F4:
- Access compressor compartment: Remove rear or side panels to expose the compressor and discharge line.
- Check sensor: Locate the thermistor on the hot discharge line. Ensure it is firmly attached and not burnt or cracked.
- Inspect wiring: Follow the harness to the PCB, checking for heat damage or cuts. Reseat the connector.
- Test and replace: Measure resistance; replace the discharge temperature sensor if readings are abnormal. If F4 persists, replace the main control board.
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Repair Difficulty
Professional Required
5/5
Required Part
Compressor Discharge Temperature Sensor
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