LG CH 25 error code

What it means

CH 25 means the outdoor unit supply voltage is outside the rated range. The system may stop to protect the inverter and compressor electronics.

Urgency

Likely causes

1. Outdoor unit supply voltage higher than rated voltage
2. Outdoor unit supply voltage lower than rated voltage
3. Temporary operation error

Homeowner fix

Power cycle once at the breaker if you can do that safely. If CH 25 returns, the breaker trips, or other home electrical symptoms are present, stop and call for service.

When to call a pro

Call a licensed HVAC technician or electrician if CH 25 returns. Tell them LG identifies CH 25 as outdoor input voltage high/low.

Repair vs replace

Voltage-supply problems are usually corrected without replacing the mini-split. Compare replacement only if repeated voltage damage has harmed major boards 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: verify rated supply voltage, voltage under load, disconnect/breaker condition, wiring, grounding, and outdoor board voltage detection. 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 five 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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