LG Refrigerator Error Code US

The US error code on an LG refrigerator indicates that the middle compartment temperature sensor, referred to as the K2 sensor, is either disconnected or has shorted out. The control board cannot receive a valid temperature reading from that sensor, so it triggers this fault code. The issue can originate from a loose connector, damaged wiring, or a failed sensor component.

A power reset may temporarily clear the US error code from the display, but if the underlying fault with the K2 sensor or its wiring has not been corrected, the code will return. A reset is useful for confirming whether the fault is intermittent, but it is not a fix. The sensor circuit must be inspected and repaired before the error will stay resolved.

If the repair is simply reseating a loose connector, there may be no parts cost at all, though a service call fee typically ranges from $75 to $150. Replacing the K2 thermistor sensor generally costs between $20 and $60 for the part, plus labor. If the main control board is found to be faulty, the total repair cost including parts and labor can range from $200 to $450 depending on the model and service provider.

A knowledgeable DIYer can start by checking whether the sensor wiring connector has simply come loose, which requires no tools and no parts. If the wiring appears intact, testing the thermistor resistance with a multimeter is the next step. Replacing a faulty thermistor sensor is a manageable repair for someone comfortable working with appliance wiring, but tracing a damaged harness or replacing a control board is generally better left to a qualified technician.

Operating the refrigerator with an active US error means the control board cannot accurately monitor the temperature in the middle compartment. This increases the risk of that section running too warm or too cold without the system detecting or correcting it. Perishable food stored in the affected compartment could be at risk, so it is advisable to address the error promptly rather than ignoring it.