LG Refrigerator Error Code E1+E2

The E1+E2 error code means the main PCB and the display PCB have lost communication with each other for at least 30 seconds continuously. These two boards communicate over a four-wire connection carrying 12V power, ground, and separate Send and Receive data lines. When that link is broken, the refrigerator flags the error. The root cause is usually a wiring or connector issue, though a failed board is also possible.

Start by inspecting the wiring harness and connectors between the main PCB and display PCB, checking all four lines: DC 12V, GND, Send, and Receive. Make sure all connectors are fully seated, pins are not bent or corroded, and the harness is not pinched or damaged. If the wiring is intact, verify that 12V is actually present at the display PCB connector. If power and wiring are confirmed good, the display PCB or main PCB may need to be replaced.

If the fix is simply reseating a connector or cleaning corroded terminals, the cost may be minimal, covering only your time or a basic service call fee. Replacing a wiring harness typically runs in the range of $50 to $150 for parts, plus labor. A replacement display PCB or main PCB can range from $100 to $300 or more depending on the model, with additional labor costs if a technician performs the repair.

A power reset may temporarily clear the E1+E2 code, but if the underlying wiring or board fault is still present, the error will return once the 30-second communication dropout occurs again. A reset is a useful first step to confirm whether the fault is intermittent or persistent. For a permanent fix, the physical cause of the communication failure needs to be identified and repaired.

The E1+E2 error affects communication between the control and display boards, which can impair your ability to adjust settings and monitor the refrigerator's status. Depending on the severity of the fault, cooling functions may also be disrupted if the main PCB cannot receive input correctly. It is best to address the error promptly rather than continue using the appliance, especially to avoid potential food spoilage if cooling is compromised.