Mitsubishi Electric Compressor Start Failure

Display works but compressor never starts; only fan runs continuously.

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 compressor start capacitor or PTC, open compressor winding, faulty relay on main PCB, low ambient temperature lockout

Safety: Unplug the unit. High voltage is present at the compressor terminals.

User checks:

Ambient temperature: Ensure the room is within the operating range. Some Mitsubishi Electric units will not start the compressor below a certain temperature.

Technician checks:

Test the compressor start device (capacitor/PTC) and replace if out of spec.
Measure compressor winding resistance and check for open or shorted windings.
Check the main PCB relay output to the compressor. Replace the main control PCB if the relay is faulty.

Professional Required 5/5

Compressor Start Device (Capacitor/PTC)

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