LG Refrigerator Error Code R-sensor open/short

This error code means the refrigerator compartment temperature sensor is reporting a circuit fault, either an open (broken) circuit or a short circuit. The control board detects this when the sensor reading falls below -50°C or exceeds +50°C, which are impossible real-world temperatures. The fault prevents the refrigerator from accurately monitoring and regulating its internal temperature. The sensor itself or its associated wiring are the most likely sources of the problem.

It is not advisable to rely on the refrigerator to maintain safe food temperatures while this error is active. Without a functioning temperature sensor, the control board cannot properly regulate cooling cycles, which may result in the compartment running too warm or too cold. Perishable food should be moved to another refrigerator until the fault is resolved.

A power reset by unplugging the refrigerator for a few minutes may temporarily clear the error code display, but the code will return if the underlying fault in the sensor or wiring has not been corrected. Resetting the unit does not repair a failed thermistor or a broken wire. A proper repair addressing the root cause is required to permanently resolve the fault.

A knowledgeable DIYer can perform basic diagnostics by inspecting the sensor wiring harness for visible damage and reseating the connector at the control board. Testing the sensor resistance with a multimeter will confirm whether the thermistor itself has failed. If the sensor is faulty, replacing it is a straightforward repair, but accessing the sensor location may require removing interior panels.

If only the thermistor sensor needs replacement, parts typically cost in the range of $15 to $50 depending on the specific model. Professional labor to diagnose and replace the sensor generally adds $80 to $200. If the wiring harness or main control board is also involved, total repair costs can be higher, potentially ranging from $150 to $400 or more.