LG Refrigerator Error Code R-sensor short

The R-sensor short error means the refrigerator compartment temperature sensor has been detected in a short circuit condition. The control board (MICOM) monitors the voltage from this sensor and flags the fault when that voltage drops below 0.5V, which corresponds to a suspected temperature reading above +50°C. The root cause is usually a failed thermistor or a short in the sensor wiring harness.

It is not advisable to continue relying on the refrigerator with this error active, as the MICOM cannot accurately read compartment temperature and may not regulate cooling correctly. Food safety could be compromised if the compartment temperature is not being properly maintained. Address the fault as soon as possible to avoid food spoilage.

A power reset may temporarily clear the error code from the display, but if the underlying short circuit in the sensor or wiring has not been corrected, the fault will return once the MICOM re-evaluates the sensor signal. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and repairing the actual cause.

A knowledgeable DIYer can often resolve this error by inspecting the sensor wiring harness for visible damage and testing the sensor resistance with a multimeter. If the sensor reads near zero ohms when disconnected, it needs to be replaced. Wiring repairs or connector cleaning are also within reach for those comfortable working with appliance electronics, but MICOM replacement is generally best left to a technician.

If only the R-sensor thermistor needs replacement, parts typically cost in the range of $10 to $40, making it one of the more affordable repairs. If a technician is needed for diagnosis and the sensor replacement, total service costs including labor generally fall in the range of $100 to $200. A MICOM control board replacement, if required, will add significantly more to that estimate.