LG Outdoor Unit Not Starting

Indoor unit powers on but compressor and outdoor fan do not start (only fan runs inside).

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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

No power to outdoor unit, Faulty communication cable between indoor and outdoor, Tripped outdoor overload or blown fuse, Failed outdoor PCB

How to Fix / Troubleshooting

Safety: Turn off power at both indoor and outdoor disconnects before inspection.

Steps:

  • Check outdoor breaker/disconnect: Ensure the outdoor unit's breaker is ON and any pull-out disconnect is fully inserted.
  • Listen for outdoor operation: With power on and cooling requested, listen near the outdoor unit. If completely silent, turn power off and inspect.
  • Inspect wiring: Remove the outdoor panel and check that line power wires are secure and that the communication cable is properly connected.
  • Reset power: Turn both indoor and outdoor power off for 10 minutes, then on, and test.

Technician required: If the outdoor unit still does not start, a technician should check for voltage at the outdoor terminals, test fuses, and diagnose the outdoor PCB and compressor.

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Repair Difficulty

Hard 4/5

Required Part

Outdoor Control PCB
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