LG Washer Error Code IS

The IS code on an LG washer indicates a failure in the Ice Maker Sensor or the Water Tank Sensor circuit. The control board is not receiving a valid signal from one of these sensors and has stopped normal operation as a result. A technician diagnoses this by measuring resistance at pins 1 and 2 of connector CON8 to pinpoint where the fault is located.

It is not recommended to continue operating the washer while the IS error is active. The machine has detected a sensor fault and may not be able to properly regulate the ice maker or water tank functions. Running the unit in this state could lead to further component damage or water-related issues.

A power reset may temporarily clear the IS code, but the error will return if the underlying sensor or wiring fault has not been corrected. Resetting the unit does not repair a failed sensor or damaged connector. A proper diagnosis and repair of the sensor circuit at CON8 is necessary to permanently resolve the error.

If you are comfortable using a multimeter, you can begin by inspecting the CON8 connector for corrosion or loose connections and reseating it to see if the error clears. Testing sensor resistance requires basic electrical knowledge and the correct expected resistance values for your specific model. If the sensor or wiring harness is confirmed faulty, replacement parts are typically required and some disassembly of the machine may be needed.

Repair costs vary depending on the root cause. If only a connector cleaning or reseating is needed, costs may be limited to a service call fee, typically in the range of $75 to $150. If a sensor or wiring harness replacement is required, parts plus labor could bring the total to between $150 and $350 depending on your location and the technician's rates.