Klarstein split or portable AC shows F3 and may shut down the compressor.

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 condenser NTC sensor, sensor detached from the coil, wiring fault, main PCB sensor circuit failure

Safety: Turn off the power and allow the unit to cool.

Steps:

Access condenser: Remove the rear/outdoor cover to access the condenser coil.
Verify sensor mounting: Ensure the sensor is firmly attached to the condenser tubing or fins. Re-secure it with a clip or aluminum tape.
Inspect harness: Check for cuts, burns, or loose connectors. Reseat the connector on the PCB.
Test sensor: Measure resistance and compare it to other NTC sensors at a similar temperature. Replace if open-circuited or short-circuited.

A persistent F3 with a functional sensor indicates a likely main PCB fault.

Medium 3/5

Condenser High-Temperature NTC Sensor

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