LG Refrigerator Error Code 8

Error code 8 on an LG refrigerator indicates a system abnormality in the CR compartment temperature sensor circuit. The CR compartment refers to a specific refrigeration zone monitored by a dedicated NTC (negative temperature coefficient) thermistor sensor. This code activates when the sensor reports a temperature reading that falls outside the valid detection range, specifically when the sensed temperature is not lower than 122°F and not higher than -58°F. In practical terms, the control board is receiving a signal from the CR sensor that it interprets as either an open circuit, a short circuit, or a reading so far out of range that it cannot be trusted for proper compartment temperature regulation.

The root causes fall into several categories: physical damage to the wiring harness connecting the sensor to the control board, a short circuit caused by pinched or chafed wires, a loose or corroded connector causing intermittent contact failure, a missing or dislodged sensor housing that exposes the thermistor to incorrect thermal conditions, or an outright sensor failure where the thermistor element itself has drifted out of specification or failed open. An open circuit in the sensor wiring will typically drive the resistance reading to infinity, while a short circuit will drive it toward zero ohms. Both conditions produce temperature readings that fall outside the valid operating window, triggering error code 8.

Diagnosis should begin with a visual inspection of the CR sensor wiring harness from the sensor housing back to the main control board connector, checking for cuts, pinching, corrosion, or disconnected plugs. If the wiring appears intact, resistance across the sensor terminals should be measured and compared against the expected NTC thermistor resistance curve for the refrigerator's ambient temperature. A failed sensor will show an out-of-range resistance reading and will require sensor replacement to resolve the fault.