LG Compressor Start Failure

Outdoor unit fan runs but compressor does not start; no cooling.

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Safety Warning

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.

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Possible Causes

Failed inverter compressor, Faulty outdoor PCB not sending drive signal, Open compressor winding, Internal compressor overload open

How to Fix / Troubleshooting

Safety: Turn off power before opening the outdoor unit. High voltage and stored energy are present.

Steps:

  • Listen for compressor: With power on and cooling requested, listen for a humming or clicking from the compressor. If silent while the fan runs, turn power off.
  • Visual inspection: Check compressor terminals and wiring for burns or loose connections.

Technician required: Compressor and inverter diagnostics require specialized tools. A technician should test compressor windings, insulation, and inverter output and replace the compressor or PCB as needed.

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Repair Difficulty

Professional Required 5/5

Required Part

Inverter Compressor
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