LG CH 23 error code

What it means

CH 23 means the outdoor inverter DC-link voltage is outside the expected range. LG's support table points to outdoor supply-voltage problems or an internal inverter circuit fault.

Urgency

Likely causes

1. Outdoor unit supply voltage overvoltage or undervoltage
2. Inverter internal circuit failure
3. Temporary operation error

Homeowner fix

Power cycle once at the breaker if you can do that safely. If CH 23 returns, the breaker trips, or lights in the home are dimming/flickering, stop and call for service.

When to call a pro

Call a licensed HVAC technician or electrician if CH 23 returns. Tell them LG identifies CH 23 as outdoor inverter compressor DC-link high/low voltage.

Repair vs replace

Supply-voltage corrections are usually repairable. If the inverter board is damaged on an older system, compare the repair quote with replacement.

• 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 incoming voltage under load, DC-link voltage, inverter circuit condition, wiring, and grounding. 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 three 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

Next step