LG Refrigerator Error Code CH

The CH error code on an LG refrigerator indicates a high side cycle leakage condition detected within the sealed refrigeration system. The "high side" refers to the portion of the refrigerant circuit between the compressor outlet and the expansion device, where refrigerant exists at high pressure and temperature. When the control system detects anomalies consistent with a leak, restriction, or mechanical failure in this section, the CH code is triggered to alert the technician that the cooling cycle has been compromised.

There are four primary root causes the system flags under this code: a refrigerant leak on the high side of the circuit, a restriction within the high side tubing or components (such as a partial blockage in the condenser or filter drier), a failing or failed compressor that cannot maintain proper pressure ratios, or a defective valve (such as the discharge valve within the compressor or a check valve in the system). Each of these conditions results in abnormal pressure behavior that the refrigerator's diagnostics interpret as high side cycle leakage.

Diagnosis follows the smart SVC UP process outlined in section 8-24 of the technical documentation. This structured diagnostic approach helps technicians differentiate between the possible causes by evaluating system pressures, compressor performance, and refrigerant charge status. Because this code involves the sealed refrigeration system, proper EPA certification is required to handle refrigerant, and diagnosis typically requires manifold gauges and specialized equipment.