LG Refrigerator Error Code R-area defroster sensor open/short

This error means the control board has detected that the refrigerator compartment evaporator defrost sensor is reporting a temperature reading below -50°C or above +50°C, which indicates either an open or short circuit in the sensor or its wiring. The defrost sensor is a thermistor that monitors evaporator coil temperature to regulate automatic defrost cycles. When the sensor circuit fails, the board cannot safely manage defrosting, and the error code is displayed to alert you to the problem.

A reset may temporarily clear the displayed error, but the code will return if the underlying fault in the sensor or wiring has not been repaired. The control board will detect the out-of-range sensor reading again on the next monitoring cycle. A proper repair of the defective sensor or wiring is required for a permanent fix.

If the repair only requires a new defrost sensor, the part itself typically costs in the range of $15 to $50 depending on the specific model. If professional labor is involved, total repair costs including diagnostics and installation generally fall in the range of $100 to $250. Costs can be higher if the control board or a larger section of wiring harness also needs replacement.

Start by unplugging the refrigerator and locating the defrost sensor near the evaporator coil in the refrigerator compartment. Disconnect the sensor connector and use a multimeter to measure resistance across the sensor terminals. An open circuit (no continuity) or a short circuit (near zero ohms) confirms a bad sensor that needs to be replaced. Also inspect the wire harness and connector for damage or corrosion before reassembling.

Continuing to run the refrigerator with this fault is not recommended for extended periods. Without a functioning defrost sensor, the automatic defrost cycle cannot operate correctly, which can lead to frost buildup on the evaporator coil, reduced airflow, and eventual loss of cooling in the refrigerator compartment. Food safety may become a concern if cooling performance drops significantly.