Unit shows F5 and may cycle on and off frequently; performance is poor.

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 outdoor ambient thermistor, Sensor exposed or displaced from proper location, Damaged sensor wiring, Faulty outdoor PCB sensor circuit

Safety first: Isolate power at the outdoor disconnect.

Steps to try:

Locate ambient sensor: Usually mounted near the outdoor air intake grille, not directly on the coil.
Check placement: Ensure it is not touching hot surfaces or enclosed in insulation.
Inspect wiring and connector: Repair any visible damage and reseat the connector.
Test resistance: Compare to ambient temperature spec; replace if out of range.

When to call a technician: If F5 remains, the outdoor PCB may be defective.

Medium 3/5

Outdoor Ambient Temperature Sensor

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