Appliance Help HQ
Menu
ENEnglishESEspañolPT-BRPortuguês

Source-backed error-code guide

Reviewed

LG Refrigerator CO / E CO / Er CO Error Code

CO is primarily a service condition, though LG notes a temporary unstable-power or electrical factor may be involved and documents one external power reset. The code does not prove which board, wire, or display component has failed.

Applies to LG refrigerator with digital or led error display

What the appliance detected

Detected condition

LG identifies CO as a communication error between the main board and the display.

What may contribute

Possible causes

  • Communication is not available between the main board and the display PCB.
  • A temporary unstable power supply or other electrical factor may have caused the inspection code.
  • LG lists main board, display PCB, or wire-disconnection concerns as service possibilities.

Start conservatively

Safe preliminary checks

Work in order and stop whenever a step is not supported by the documentation for your model.

  1. Record the code and model

    • Photograph or write down the exact CO display before clearing power.
    • Confirm the full model number and owner manual so the service request has accurate product details.

  2. Stop for electrical warning signs

    • Stop using the refrigerator for sparking, a burning odor, visible electrical damage, repeated breaker trips, or water contacting electrical parts.
    • Do not touch damaged cords, outlets, controls, or wiring. Use qualified help for electrical hazards.

  3. Reset power once as LG documents

    • If there are no electrical warning signs, unplug the refrigerator or turn off its dedicated breaker, wait about five minutes, and restore power.
    • If CO returns, preserve the code and request LG service rather than repeating resets.

Actions not recommended

  • Do not open the display, control panel, rear cover, main board area, or wiring harnesses.
  • Do not test internal voltage, continuity, boards, or connectors.
  • Do not treat CO as proof that a specific board or display part has failed.

When to stop and request service

  • Request LG service if CO repeats after the documented external reset.
  • Request service immediately when the refrigerator is not cooling, the display remains unusable, or electrical warning signs are present.
  • Stop whenever diagnosis would require internal access, wiring checks, or board inspection.

Documented source

Official information reviewed

Our summary is based on manufacturer support material and stays within the limits of that material.

Source reviewed by Appliance Help HQ: August 17, 2026.

Appliance Help HQ is an independent informational site and is not affiliated with or endorsed by LG.

Think this information has changed? Report a correction.