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LG Air Conditioner Error Codes

Find the code shown on your LG air conditioner and get a plain-English explanation with step-by-step fixes, easiest first. We cover 13 LG air conditioner codes, including CH05, CH01 / CH02 / CH06, CH03, CH04.

All 13 LG air conditioner codes

• CH05Indoor and outdoor units aren't communicating
• CH01 / CH02 / CH06Temperature sensor fault
• CH03Wired wall controller problem
• CH04Drain problem or water tank full
• CH07Indoor units set to conflicting modes
• CH10Indoor fan motor problem
• CH67Outdoor fan blocked or faulty
• CH61Unit overheating
• CH38Low refrigerant protection
• CH32 / CH33 / CH36Outdoor refrigerant or compressor protection
• CH21 / CH23 / CH26 / CH29Outdoor compressor or drive circuit fault
• CH54Reversed or missing power phase
• CH93Outdoor unit not powered or not responding

About LG air conditioner error codes

LG Electronics is a South Korean manufacturer and one of the best-selling appliance brands in the US. LG appliances show short letter-and-number codes on the main control panel, and many recent models can also report them to the LG ThinQ app.

Of the 13 codes on this page, 1 usually have a simple fix you can do yourself, and 5 usually need a technician. Each guide tells you which is which, so you don't pay for a service call you don't need, and you don't attempt a repair that isn't safe.

Before you start

• Write down your model number. It's on a sticker, usually inside the door or lid, on the frame, or on the back or side panel. Parts and some code meanings depend on it.
• Try a reset. Unplug the air conditioner or switch off its breaker for 10 minutes. This clears many one-off glitches without tools.
• Clean or replace the air filter first. A dirty filter causes many airflow and freezing codes.
• Never open refrigerant lines or electrical panels. Those are jobs for a licensed HVAC technician.