Trane air conditioner shows F5 and may not start the compressor; system may run fan only.

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.

Possible Causes

Failed compressor thermistor, Sensor detached from compressor shell, Damaged sensor wiring, Control board sensor circuit failure

Safety first: Turn off power at the disconnect and allow the compressor to cool before touching.

Locate sensor: The sensor is usually strapped or clipped to the compressor shell. Ensure it is firmly attached and not hanging loose.
Inspect harness: Check the sensor wires for heat damage or abrasion against metal edges. Repair or reroute as needed.
Reconnect: Verify the sensor connector is fully seated on the outdoor control board.

If F5 persists, the compressor temperature sensor or control board may need replacement by a technician.

Hard 4/5

Trane Compressor Temperature Sensor

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