Trane Condenser Coil Temperature Sensor Fault

Trane air conditioner displays F4 and may limit compressor operation; defrost or protection modes may be affected on heat pump models.

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

Open or shorted condenser coil sensor, Sensor dislodged from coil, Damaged sensor harness, Faulty outdoor control board input

Safety first: Shut off power to the outdoor unit before removing panels.

Find coil sensor: Look for a small sensor clipped to the condenser coil tubing. Ensure it is firmly clipped and making good contact.
Check wiring: Inspect the sensor wires for damage and verify the connector is secure on the control board.
Clean area: Remove debris and dirt around the sensor to ensure accurate temperature readings.

If F4 remains, the condenser coil sensor should be replaced with a Trane OEM part.

Medium 3/5

Trane Condenser Coil Temperature Sensor

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