LG Refrigerator Error Code Error1

Error1 on an LG refrigerator indicates that the freezer temperature sensor has been detected as abnormal due to a short circuit or open circuit condition. The control board monitors the sensor's resistance through connector CON7 PIN 1 and PIN 2 to track freezer temperature, and when that resistance is out of range, it triggers this error. The fault can be in the sensor itself, the wiring harness, or the connector.

Operating the refrigerator with an active Error1 code is not recommended for extended periods. Without a functioning freezer sensor, the control board cannot accurately regulate freezer temperature, which can lead to food safety issues and potential compressor or component damage from uncontrolled cycling. It is best to address the fault promptly.

If only the freezer thermistor needs replacement, parts typically cost in the range of $15 to $50 depending on the specific model. If a service technician is needed, labor plus parts can bring the total repair cost to roughly $100 to $250. Wiring harness repairs or control board replacement would fall toward the higher end of that range.

A knowledgeable DIYer with a multimeter can perform the initial diagnostic by checking resistance at CON7 PIN 1 and PIN 2 on the freezer sensor connector. If the connector is simply loose or corroded, reseating or cleaning it may resolve the issue without parts. However, replacing the thermistor or repairing a damaged wiring harness requires some comfort with appliance disassembly and electrical work.

A power reset may temporarily clear the Error1 display, but the code will return if the underlying sensor fault is still present. Because the error is triggered by an actual electrical condition in the sensor circuit, a reset does not fix the problem. The sensor resistance at CON7 PIN 1 and PIN 2 must be within the normal range for the error to stay cleared.