Indoor unit displays F4 and the system may shut down or fail to heat/cool properly.

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

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

Locate condenser sensor: It is usually clipped directly to the outdoor condenser coil tubing.
Check attachment: Ensure the sensor is firmly clipped to the coil and making good thermal contact.
Inspect wiring and connector: Look for cuts, corrosion, or loose plugs at the outdoor PCB.
Replace sensor: If damaged or if F4 persists after reseating, replace with the correct Haier condenser temperature sensor.

Medium 3/5

Outdoor Condenser Temperature Sensor

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