LG Refrigerator Error Code DEFROSTING SENSOR OF CR COMPARTMENT

The CR compartment defrosting sensor error indicates a fault detected in the temperature sensor responsible for monitoring the defrost cycle in the refrigerator's CR (chiller or compartment) section. The Main PCB continuously reads the resistance output of this sensor to track temperature. When the reported sensor temperature falls outside the valid operating range, specifically not lower than -58°F and not higher than 122°F, the board flags this error. A reading outside those bounds almost always points to a sensor that has failed open, shorted, lost contact with its connector, or is physically absent from its housing.

The first diagnostic step is to measure the voltage across Main PCB connector CN 30, pins 13 and 14. A reading between 1.0V and 4.5V confirms the sensor circuit is delivering a signal within the acceptable window. A voltage at or near 0V typically indicates a short circuit in the wiring or sensor element itself, while a voltage close to the full supply rail suggests an open circuit, most likely a broken wire or disconnected connector. Either condition will prevent the board from calculating a valid temperature, triggering this error code.

Common root causes include damaged wiring harnesses that have cracked or chafed due to freezing and thawing cycles, corroded or loose connector pins at CN 30, a failed thermistor sensor element, or a sensor that has physically separated from its housing mount. Because the defrost cycle depends on accurate temperature readings from this sensor, an unresolved fault can lead to frost accumulation in the compartment and reduced cooling performance over time.