F5
Sencor
Outdoor Coil Temperature Sensor Fault
Display shows F5, unit may not defrost properly or may shut down in heating mode.
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Safety Warning
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.
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Possible Causes
Open or shorted outdoor coil NTC sensor, Sensor not attached to coil, Damaged sensor wiring, Faulty outdoor PCB sensor circuit
How to Fix / Troubleshooting
Safety first: Isolate power at the breaker. Outdoor coils can have sharp fins; wear gloves.
- Step 1 – Locate sensor: The outdoor coil sensor is usually clipped to the coil tubing or fins in the middle of the outdoor unit.
- Step 2 – Check mounting: Ensure the sensor is firmly attached to the coil. Reattach with the original clip or aluminum tape if loose.
- Step 3 – Inspect wiring: Follow the sensor wires to the PCB, checking for damage or UV deterioration. Reseat the connector.
- Step 4 – Resistance test: With power off, measure sensor resistance and compare to expected NTC values. Replace if defective.
- Step 5 – Replace sensor: Install a new Sencor outdoor coil sensor and secure it to the coil.
- Step 6 – PCB replacement: If F5 persists, the outdoor PCB may be faulty and should be replaced by a professional.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Coil Temperature NTC Sensor
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