Written by
Maya Chen Editorial TeamPublished September 5, 2026Updated October 20, 2026
Error codeC0, CO
ApplianceRefrigerator
Quick answer
C0 or CO on an LG refrigerator is a communication error between the control board and the display.
Model compatibility: LG reuses codes across series and model years, so C0, CO may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Communication error between main board and display.
An LG refrigerator may show C0, often read as CO. It indicates a communication error between the main board and the display.
What LG advises
There are no troubleshooting steps. Request service, since the refrigerator requires a repair service.
Models
LG refrigerators, including digital and analog display models listed by LG.
Related codes
C1 is another communication error, between dispenser and display.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your LG appliance?
Book a specialist visit for a clear estimate and approval before any repair.
