Indoor unit shows H7 and the compressor does not start or runs abnormally.

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

Faulty compressor, Incorrect phase detection by inverter PCB, Loose compressor connector, Damaged current/position sensing circuit

Safety first: Power off and wait for inverter capacitors to discharge. Only trained personnel should work on inverter circuits.

Check compressor connector: Ensure the multi-pin connector to the compressor is fully seated and not burnt.
Inspect PCB: Look for visible damage on the outdoor inverter PCB.
Do not bypass protections: Running a faulty compressor can cause catastrophic failure.
Professional diagnosis: A technician should test compressor windings and replace the outdoor PCB or compressor as indicated.

Professional Required 5/5

Inverter Compressor

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