LG Refrigerator Error Code UART COMMUNICATION ERROR

This error indicates the refrigerator's control board cannot communicate with the PLC modem, a component used for power line networking or smart home connectivity. The UART protocol is the serial communication method used between these components. Importantly, if your LG refrigerator model does not include a PLC modem, this error is not a defect and the refrigerator is operating normally. No cooling or food safety functions are affected by this code alone.

Yes, this error relates only to the communication link with the PLC modem and does not affect the core functions of the refrigerator, including the compressor, cooling system, or temperature regulation. Your food should remain safe as long as temperatures are being maintained normally. You can continue using the refrigerator while investigating the cause of the error.

If the error is simply due to the model not having a PLC modem, the cost is nothing since no repair is required. If a loose harness connection is the cause, a service call to diagnose and reseat the connector might range from around 75 to 150 dollars depending on your area. If the PLC modem module itself needs to be replaced, parts and labor combined could range from approximately 150 to 350 dollars. Replacing the main control board, in the uncommon event it is at fault, typically costs more.

Start by determining whether your specific LG refrigerator model is equipped with a PLC modem. If it is not, no repair is needed and the error can be disregarded. If your model does include a PLC modem, check that its wiring harness is securely connected to both the modem and the main control board. If connections are intact and the error continues, the modem module itself may need to be replaced.

A power reset may temporarily clear the error display, but if the underlying cause is a disconnected or faulty PLC modem on a model that requires one, the error will return once the control board re-runs its communication checks. On models without a PLC modem, the error may reappear after a reset as well, since the board continues to poll for the absent component. A reset alone is not a fix for an actual modem connection or hardware issue.