F4
SMEG
Compressor Discharge Temperature Sensor Fault
F4 code; the compressor may not start or may shut down unexpectedly.
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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/shorted discharge NTC sensor, Sensor not properly clamped to the discharge line, Damaged sensor harness near the compressor, Connector issue on the outdoor PCB.
How to Fix / Troubleshooting
Safety first: Turn off power and wait for components to cool before touching the compressor area.
- Locate discharge sensor: It is usually strapped to the small-diameter discharge pipe near the compressor.
- Check clamp and insulation: Ensure the sensor is tightly clamped and insulated as originally installed.
- Inspect wiring: Look for heat damage or brittle insulation near the compressor.
- Replace sensor: If faulty, install a new SMEG discharge sensor and secure it firmly to the pipe.
Incorrect readings from this sensor can cause nuisance trips; ensure proper installation.
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Repair Difficulty
Hard
4/5
Required Part
Compressor Discharge Temperature Sensor
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