J3
Daikin
Outdoor Heat Exchanger Thermistor Fault
Daikin controller shows J3; outdoor coil temperature reading abnormal
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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 or shorted outdoor coil thermistor, Disconnected sensor plug, Damaged sensor wiring, Corroded connector
How to Fix / Troubleshooting
Safety first: Turn off power before opening the outdoor unit.
Technician steps:
- Locate the outdoor coil thermistor clipped to the heat exchanger.
- Check that it is firmly attached and the connector is secure.
- Measure resistance and compare with Daikin specs; replace if faulty.
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Repair Difficulty
Medium
3/5
Required Part
Outdoor Heat Exchanger Thermistor
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