F4
Camry
Discharge Temperature Sensor Fault / High Discharge Temperature
F4 displayed; 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
Faulty compressor discharge sensor (T5) on Camry outdoor unit, Sensor not properly attached to discharge line, Blocked condenser coil causing high discharge temperature, Low refrigerant flow due to restriction
How to Fix / Troubleshooting
Safety first: Power off and allow the outdoor unit to cool before touching any copper lines.
- 1. Check T5 sensor mounting: Ensure the sensor is tightly clamped to the compressor discharge line and insulated as per factory design.
- 2. Inspect for coil blockage: Clean the outdoor coil thoroughly to improve heat rejection.
- 3. Test sensor: Measure resistance and compare with Camry’s NTC chart. Replace if faulty.
- 4. Look for restrictions: A technician should check for blocked filter-driers, capillary tubes, or expansion valves if high discharge temperature persists.
- 5. Verify fan operation: Confirm that the outdoor fan is running at correct speed to cool the condenser.
Note: Persistent F4 after sensor replacement indicates a deeper refrigeration or compressor issue requiring professional service.
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Repair Difficulty
Hard
4/5
Required Part
Compressor Discharge Temperature Sensor (T5)
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