LG Refrigerator Error Code F-defroster sensor short

This error code means the control board has detected a short circuit in the freezer area defrost sensor. The sensor is reading a signal that corresponds to a temperature above +50°C, which is outside the normal operating range and indicates the sensor has failed. The defrost sensor monitors temperatures during the automatic defrost cycle to protect the evaporator components. A shorted sensor needs to be confirmed through the self-diagnostic function and then replaced.

The refrigerator may continue cooling in the short term, but a faulty defrost sensor can disrupt the automatic defrost cycle. Over time, this can lead to frost accumulation on the evaporator coils, which reduces cooling efficiency and can eventually cause the freezer to stop maintaining proper temperatures. It is best to address the error promptly rather than continue operating the unit without a functioning sensor.

If you are doing the repair yourself, the freezer defrost sensor part typically costs in the range of $15 to $45 depending on the specific model. If you hire a technician, total repair costs including labor generally fall in the range of $100 to $250. The repair is relatively straightforward on most LG models, making it a common DIY fix for those comfortable working with refrigerator components.

Start by running the refrigerator's built-in self-test function to confirm the fault is active. Once confirmed, inspect the sensor wiring harness in the freezer compartment for any visible damage, pinching, or corrosion at the connector. If the wiring looks intact, the freezer defrost sensor itself will need to be replaced. After installing a new sensor, run the self-test again to verify the error has cleared.

A power reset may temporarily clear the error code, but it will return as soon as the control board reads the sensor signal again and detects the same short circuit condition. Because the fault is caused by a physical problem with the sensor or its wiring, resetting the unit does not address the underlying cause. A proper repair requires diagnosing and replacing the faulty component.