LG Refrigerator Error Code 8E

The 8E error code on an LG refrigerator indicates a humidity sensor fault. The humidity sensor monitors moisture levels inside the refrigerator compartment, allowing the control system to regulate conditions and prevent excessive condensation. When the Main PCB detects an abnormal signal from this sensor, it triggers the 8E code and flags one of four specific fault conditions: physical separation of the sensor from its housing, a contact error at the connector, a complete disconnection of the sensor wiring, or a short circuit within the sensor or its circuit.

The first diagnostic step is to measure the voltage between Main PCB connector CN30-3 and CN76-1. A properly functioning sensor circuit will produce a voltage reading that falls between 1.0V and 4.5V. A reading outside this range, or no voltage at all, confirms an electrical fault in the sensor circuit. This voltage range represents the analog signal the sensor uses to communicate humidity levels to the Main PCB, so a shorted sensor will typically pull the voltage toward one extreme, while an open circuit or disconnection will produce an out-of-range or absent reading.

Physical inspection should accompany voltage testing. The sensor housing connection points should be checked for corrosion, bent pins, or loose seating at the harness connector. Wiring between the sensor and the Main PCB should be traced for damage, pinching, or breaks. If wiring and connectors test normal but voltage is still out of range, the sensor itself has likely failed internally and will require replacement.