LG CH 93 error code

What it means

CH 93 indicates communication trouble between the indoor and outdoor units. LG also notes that on models released after 2021, this can appear when the outdoor unit is not receiving power.

Urgency

Likely causes

1. Communication problem between indoor and outdoor units
2. Unstable communication during test run
3. Outdoor unit not receiving power on some post-2021 models
4. Temporary fault from unstable power or other electrical factors

Homeowner fix

Make sure the outdoor unit power plug, if present, is fully plugged into a dedicated wall outlet and that the air-conditioner breaker is on. Power cycle once. If the breaker will not stay on, stop.

When to call a pro

Call a licensed HVAC technician if CH 93 returns, appears after installation, or the outdoor unit has no power. Tell them LG identifies CH 93 as indoor/outdoor communication, with outdoor-power checks on post-2021 models.

Repair vs replace

Power or communication faults are usually repairable. Compare replacement only if an older system needs multiple boards or major electrical repairs.

• 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 indoor/outdoor power, post-2021 separate power requirements, communication stability, wiring, and board communication. 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 ninety 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