LG CH 27 error code

What it means

CH 27 means the outdoor power-factor or power-stage circuit detected overcurrent. LG's support table points to overload operation or damaged internal PCB components.

Urgency

Likely causes

1. Overload operation
2. PCB internal component burnout
3. Temporary operation error

Homeowner fix

Turn the system off and power cycle once at the breaker if you can do that safely. If CH 27 returns or the breaker trips, stop using the system.

When to call a pro

Call a licensed HVAC technician if CH 27 returns. Tell them LG identifies CH 27 as PSC/PFC overcurrent.

Repair vs replace

A power-stage board repair may be significant. Compare a major outdoor-board quote with replacement on older equipment.

• LG Mega R-32 9,000 BTU (115V)

  Mega R-32

• LG Mega R-32 9,000 BTU (230V)

  Mega R-32

• LG Mega R-32 12,000 BTU (115V)

  Mega R-32

• LG Mega R-32 12,000 BTU (230V)

  Mega R-32

For your technician

Technician note: diagnose PFC/PSC circuit, outdoor PCB damage, overload causes, supply voltage, and compressor/inverter current. Page context: LG maps this display to the Mega R-32 line; source: LG official support pages: [LG Air Conditioner] Guide to Error Codes; [LG Air Conditioner] How to Check Air Conditioner Error Codes; LG status-display help articles; LG Korea [LG Air Conditioner] Air conditioner error inquiry cross-check; display convention: match the letter C, letter H, and twenty seven marker exactly before comparing neighboring codes.

Which systems show it

Mega R-32

Related troubleshooting

Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.

Related codes

Source

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