Westinghouse Condenser Coil Sensor Out of Range (Alternate Code Set)

Display shows F4 and unit may stop heating or cooling; often related to outdoor coil temperature.

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

Thermistor drift or failure, sensor not attached to coil, wiring damage, PCB sensor circuit failure

Safety: Disconnect power before opening the outdoor unit.

Steps:

Check sensor mounting: Confirm the condenser sensor is firmly attached to the coil or discharge line.
Inspect wiring: Look for heat-damaged insulation or loose connectors.
Replace sensor: If the sensor is suspect, install a new Westinghouse condenser thermistor.
PCB diagnosis: If F4 remains, the outdoor PCB may require replacement by a professional.

Medium 3/5

Condenser Temperature Sensor

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