LG HVAC Services in The Bay Area | Airstars

LG units are essentially high-powered computers that move air, and when a fault occurs, they communicate through specific “CH” codes to protect their internal components.

Code CH01: The system has detected an issue with the indoor air thermistor, which usually means the sensor is open or short-circuited.

Code CH02: This indicates a fault with the indoor pipe sensor, a common result of a loose connection or a sensor that has drifted out of its normal resistance range.

Code CH05: This is one of the most frequent issues we see in the East Bay, signaling a communication failure between the indoor and outdoor units that often requires a professional wiring inspection.

Code CH38: This is a critical warning that the system has detected a low refrigerant charge, which necessitates a leak test and a recharge to prevent compressor damage.

Code CH61: This points to a high-temperature trip on the outdoor condenser pipe, often caused by dirt buildup or a failing fan during a hot afternoon.

Code CH67: This signifies a permanent magnet fan motor lockout, indicating a mechanical or electrical failure in the outdoor fan that prevents heat from being exhausted.

You can find further technical reading on the safety of high-pressure refrigerant systems and electrical standards via the Air Conditioning, Heating, and Refrigeration Institute (AHRI).