Klarstein split or portable AC shows F3 and may shut down 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 coil, wiring fault, main PCB sensor circuit failure

Safety: Turn off power and let the unit cool.

Steps:

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

Persistent F3 with a good sensor indicates a likely main PCB fault.

Medium 3/5

Condenser High-Temperature NTC Sensor

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