CH29
LG DC Compressor Position or Speed Error

System shows CH29 and will not run or cycles off quickly.

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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

Faulty compressor position sensor (if equipped), Internal compressor mechanical fault, Inverter PCB control failure, Loose compressor connector

How to Fix / Troubleshooting

Safety: Disconnect power before opening the outdoor unit. Compressor terminals carry high voltage.

Steps:

  • Check compressor wiring: Ensure the compressor connector is fully seated and that no wires are loose or damaged.
  • Listen for abnormal sounds: When briefly powered, if allowed, listen for loud knocking or grinding from the compressor, then turn power off.

Technician required: CH29 typically indicates a compressor or inverter control issue that requires specialized tools and knowledge. A professional should test the compressor windings, insulation, and inverter output and replace the compressor or outdoor PCB as needed.

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Repair Difficulty

Professional Required 5/5

Required Part

Inverter Compressor
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