LG Refrigerator Error Code Er IS

Er IS indicates an icing sensor error. The control board detected either a short circuit or a disconnection in the icing sensor circuit and can no longer get a valid reading from the sensor. The fault can be in the sensor itself, the wiring, or the connector.

The refrigerator may continue to cool, but icing and defrost functions can be compromised without a working icing sensor signal. Running the unit long-term with this code active risks frost buildup on the evaporator or inadequate cooling. It is best to diagnose and resolve the fault within a few days rather than ignoring it.

Disconnect the icing sensor connector and use a multimeter set to resistance (ohms) to read across the two sensor terminals. Compare the reading to the resistance spec in your model's service manual, as the target value varies by model. A reading of zero ohms indicates a short inside the sensor, while an infinite or open reading indicates the sensor element has failed. Either condition confirms the sensor needs replacement.

Start by unplugging the refrigerator and locating the icing sensor wiring harness, typically routed near the evaporator. Check that the connector is fully seated and that no wires are pinched, cut, or corroded. Reconnect any loose connections, restore power, and check if the code clears. If the code returns, use a multimeter to test the sensor's resistance against the spec in your service manual. A sensor reading open or shorted needs to be replaced.

If the fix is a loose connector, the repair costs nothing beyond your time. A replacement icing sensor part typically runs between $15 and $50 depending on the model. If you hire a technician, expect a service call fee of $75 to $150 plus parts and labor, bringing the total to roughly $100 to $250. This is a repair that many owners with basic mechanical comfort can complete themselves if the sensor is accessible.