LG Refrigerator Error Code R-defrost sensor short

This error code means the control board has detected a short circuit condition in the defrost sensor located in the refrigerator compartment. The board monitors sensor resistance to track temperatures during defrost cycles, and it triggers this fault when the reading suggests a temperature above +50°C or a resistance value too low to be valid. The fault points to either a damaged sensor, a wiring problem, or a connector issue in that circuit.

The refrigerator may continue to cool, but the defrost system may not operate correctly with a faulty sensor, which can lead to ice buildup over time and reduced efficiency. Food safety depends on whether the refrigerator compartment is maintaining proper temperature. It is best to address the fault promptly and monitor the internal temperature closely until the repair is completed.

A power reset may temporarily clear the error code from the display, but the fault will return if the underlying problem with the sensor or wiring has not been corrected. The control board will re-detect the short circuit condition the next time it checks the sensor circuit. A permanent fix requires diagnosing and resolving the actual electrical fault, not just resetting the unit.

A knowledgeable DIYer can diagnose this fault by disconnecting the R-defrost sensor and testing it with a multimeter for a near-zero or abnormally low resistance reading. If the sensor is confirmed faulty, replacing it is a straightforward repair involving disconnecting the old sensor and connecting the new one. However, if the wiring harness or control board is involved, the repair becomes more complex and a technician may be advisable.

If only the defrost sensor needs replacement, parts typically range from around $10 to $40 depending on the specific model, and the repair is relatively inexpensive. If a technician is needed, labor costs will add to that total, generally bringing the overall repair into the $75 to $200 range. A wiring harness or control board replacement would increase costs further.