Tosot Defrost Temperature Sensor / Outdoor Coil Sensor Fault

Indoor unit displays F5; the unit may stop during defrost or heating.

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

Defective defrost sensor on outdoor coil, Sensor not in the correct position, Wiring harness damage, Outdoor PCB misreading the sensor.

Safety first: Turn off power at the outdoor disconnect.

Locate defrost sensor: On heat pump models, the defrost sensor is attached to the outdoor coil or piping.
Verify placement: Ensure the sensor is in the factory-specified location and firmly attached.
Inspect wiring: Check for damage and reseat the connector on the outdoor PCB.
Replace sensor: If F5 remains, replace the defrost/coil sensor with the Tosot-specified part.

Medium 3/5

Outdoor Defrost Temperature Sensor

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