LG Refrigerator Error Code R-defroster sensor short

This error code means the refrigerator compartment defrost sensor has been detected as having a short circuit fault. The control board sees a sensor reading that corresponds to a temperature above +50°C, which indicates an electrical problem with the sensor or its wiring rather than an actual temperature condition. The defrost system may be disabled or behave abnormally while this fault is active.

The refrigerator may continue to cool in the short term, but with the defrost sensor faulty, the defrost cycle cannot be properly controlled. Over time this can lead to excessive frost buildup on the evaporator coil, which reduces cooling efficiency and can eventually cause the refrigerator to stop cooling altogether. It is best to address the fault promptly to avoid food spoilage.

A power reset may temporarily clear the fault code from the display, but the error will return if the underlying short circuit in the sensor or wiring is still present. The self-test function should be used to confirm whether the fault is still active after a reset. Clearing the code without repairing the root cause does not resolve the defrost system problem.

A knowledgeable DIYer can attempt to diagnose this fault by running the refrigerator's self-test mode and then visually inspecting the sensor wiring harness and connector for damage or corrosion. If the sensor itself has failed internally, replacing the R-area defroster sensor is a straightforward repair that involves unplugging the old sensor and plugging in the new one. However, if the wiring harness is damaged or the control board is suspected, professional repair is recommended.

If only the defrost sensor needs replacement, parts typically cost in the range of $15 to $50 depending on the specific model, and a professional technician's labor for this repair generally adds $80 to $150. If the wiring harness or control board is also involved, total repair costs can rise to the $150 to $400 range. Getting a diagnosis first helps confirm exactly which components need to be replaced.