Tosot Compressor Position Protection / Inverter Startup Fault

Indoor unit shows H7, compressor does not start

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

Compressor rotor locked, Incorrect phase output from inverter, Loose compressor terminal connections, Faulty inverter PCB

Safety first: Disconnect power and wait for capacitors to discharge. This fault requires professional service.

Check compressor terminals: Ensure all terminals are tight and not burnt.
Visual PCB check: Inspect the inverter board for obvious damage.
Professional tests: A technician should measure compressor winding resistance and test inverter output. Replace the compressor or inverter PCB as indicated.

Professional Required 5/5

Inverter Compressor

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