Written by
Marcus Lindqvist Appliance Care EditorPublished October 26, 2026
VERIFIED
Error codeC0, CO
ApplianceRefrigerator
C0 or CO
People often read the zero as the letter O, and either way the meaning is a communication error: the main board and the display cannot talk to each other.
What LG recommends
Request service. LG supplies no troubleshooting for this code, and a repair service is required.
Which refrigerators
LG refrigerators, among them the digital and analog display models on LG’s lists.
Related codes
C1: another communication error, this one between dispenser and 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
The main board and the display have a communication error.
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.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
Service areas are listed on the Locations page. Contact us with your ZIP code to confirm current coverage for your address.
Ready to get your LG appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
