LG Refrigerator Er CO Error Code

Main board and display are not communicating. Here is what it means and how to clear it, easiest fix first.

Er CO

May need a pro

The main control board and the display board stopped talking to each other. It can be a temporary glitch from unstable power, but it can also come from a failed board or a loose wire, so it is worth having inspected if it repeats.

Also shown as E CO. C1 is a similar communication fault between the display and the dispenser, and Od is between the display and the Wi-Fi module.

Safety first: unplug the refrigerator (or switch off its breaker) before touching filters, hoses or panels. If you smell burning or gas, or see water near the outlet, stop and call a professional.

How to fix LG Er CO

Reset the power
Unplug the refrigerator or switch off its breaker, wait about 5 minutes, then restore power.
Plug directly into the wall
Make sure the fridge is not on an extension cord or power strip, which can cause unstable power.

When to call a technician

If the same code returns after a reset, request service. Do not open panels or boards yourself.

Parts that commonly cause Er CO

Main control board
Display board
Wire harness

Order parts by your exact model number so they fit.

Other LG refrigerator codes

Frequently asked questions

What does Er CO mean on a LG refrigerator?

Can I fix LG Er CO myself?

Only the basic checks. You can safely try the steps above, but Er CO usually points to a part or fault that needs a technician.

What if Er CO keeps coming back?

A code that returns after a reset and the checks above usually means a part is wearing out. Note when Er CO appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.

Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.

References