LG CH 04 error code

What it means

CH 04 means condensate water is not being removed the way the unit expects, or a full-water condition is being detected on models that use that display. If water is present at the indoor unit, treat it as a fault that can cause water damage.

Urgency

Likely causes

1. Condensate formed inside the indoor unit is not draining
2. Indoor drain malfunction on applicable indoor-unit types
3. Full condensate tank or full-water detection on applicable models
4. Temporary control error after power instability

Homeowner fix

Turn the unit off if water is visible. Check only the outside end of the drain for an obvious blockage or kink, then power cycle once at the breaker if you can do that safely. Do not open the indoor unit.

When to call a pro

Call a licensed HVAC technician if CH 04 returns, water is dripping, or the drain is not visible outside. Tell them LG identifies CH 04 as an indoor drain or full-water warning.

Repair vs replace

Drain faults are usually repairable and rarely justify replacing the system unless water damage or multiple major failures are already present.

• 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: inspect condensate pan, drain path, drain pump or float where installed, and indoor drain-safety input. 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 four 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