Display shows F4, and the outdoor unit may not run correctly.

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 NTC sensor, sensor detached from condenser coil, damaged sensor harness, faulty outdoor PCB sensor circuit.

Safety first: Isolate power to the outdoor unit before opening any panels.

Step 1 – Locate the condenser sensor: It is typically clipped to the condenser coil tubing or attached to the coil fins.
Step 2 – Verify mounting: Ensure the sensor is in firm contact with the coil. Reattach it if loose.
Step 3 – Inspect wiring: Look for corrosion or damage along the sensor wires and at the PCB connector.
Step 4 – Replace the sensor: Install a new TCL condenser temperature sensor if the original is faulty.
Step 5 – Replace the PCB if needed: If F4 remains, the outdoor PCB may need replacement.

Warning: Do not bend or damage the condenser tubes while working around the coil.

Medium 3/5

Condenser Temperature Sensor

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