LG Refrigerator Error Code Er 1

Er 1 on an LG refrigerator indicates a refrigerator compartment sensor failure. The control board has detected either a short circuit or an open circuit on the sensor wiring located in the control box. This prevents the refrigerator from accurately monitoring its internal temperature, which can affect cooling performance.

A reset may temporarily clear the Er 1 code from the display, but if there is an actual fault in the sensor, wiring, or connector, the error will return. The underlying issue needs to be diagnosed and repaired for the code to stay cleared permanently.

If only a connector needs reseating, there may be no parts cost at all. A replacement refrigerator compartment sensor typically costs in the range of $15 to $50 for the part. If you hire a technician for diagnosis and repair, total service costs generally range from $100 to $250 depending on your location and the extent of the wiring damage.

Some cases of Er 1 can be resolved by a knowledgeable DIYer. Start by checking for a loose connection at the CON4 connector in the control box and reseating it firmly. If that does not clear the code, you will need a multimeter to measure resistance between the White wires at CON4 to determine whether the sensor or wiring harness needs to be replaced.

The Er 1 code means the refrigerator cannot accurately read its internal temperature, which means the cooling system may not operate correctly. Food safety could be at risk if the compartment temperature is not being properly regulated. It is best to address the fault promptly and monitor your food until the repair is completed.