F3
Hisense
Discharge Temperature Sensor (T3) Abnormal / Out-of-Range Reading
Indoor unit displays F3 and the unit may shut down under heavy load.
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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
Loose discharge sensor on compressor line, Sensor drift due to high temperature exposure, Damaged sensor wiring, Faulty outdoor PCB sensor circuit
How to Fix / Troubleshooting
Safety first: Power off at the breaker. The discharge line can be extremely hot; allow time to cool before touching.
- Step 1 – Verify sensor attachment:
- Locate the T3 sensor on the small copper discharge line near the compressor.
- Ensure it is tightly clamped and insulated as originally installed.
- Step 2 – Inspect wiring:
- Check for brittle or heat-damaged insulation.
- Replace the sensor if the wiring is compromised.
- Step 3 – Replace sensor if suspect:
- Disconnect from the PCB and install a new Hisense-compatible discharge sensor.
- Step 4 – Technician follow-up: If F3 remains, the outdoor PCB or compressor operating conditions must be evaluated by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Compressor Discharge Temperature Sensor (T3 Thermistor)
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