ErrorCodeDoctor
LG · Refrigerator (Side-by-Side)

LG Refrigerator (Side-by-Side) CO error code

Difficulty: Hard · Cost: $100–$350 · Duration: 5m

The CO error means your LG refrigerator has detected a communication failure between the main control board and the display panel. The control board is the brain of the refrigerator and the display is how it communicates settings and status to you — when they cannot talk to each other the unit cannot operate normally. This is often caused by a temporary electronic glitch and a reset resolves it in many cases. If the error keeps returning after resetting the wiring or one of the boards will need professional inspection.

Common causes

  • Temporary electronic glitch disrupting communication between the control board and display
  • Wiring connection between the main control board and the display panel is loose or damaged
  • Main control board has malfunctioned or failed
  • Display board has developed a fault

How to fix it

  1. 1

    Unplug the refrigerator from the outlet and wait 5 minutes

  2. 2

    Plug it back in and check if the CO error has cleared

  3. 3

    If CO returns after resetting contact a technician to inspect the wiring and control boards

Related LG Refrigerator (Side-by-Side) error codes

1

OF F

Demo mode is active — all cooling has been disabled

easy
2

FS

The freezer temperature sensor has a short circuit or disconnection

hard
3

rS

The refrigerator temperature sensor has a short circuit or disconnection

hard
4

dS

The defrost sensor has a short circuit or disconnection

hard

CO error — frequently asked questions

What does the CO error mean on a LG refrigerator (side-by-side)?

The main control board and the display panel have lost communication

What causes the CO error?

The CO error is usually caused by: Temporary electronic glitch disrupting communication between the control board and display; Wiring connection between the main control board and the display panel is loose or damaged; Main control board has malfunctioned or failed; Display board has developed a fault.

Can I fix the CO error myself?

This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.

How much does it cost to fix the CO error?

Fixing the CO error on a LG refrigerator (side-by-side) typically costs $100–$350, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my refrigerator (side-by-side) with the CO error?

We'd recommend addressing the CO error before continuing to use the refrigerator (side-by-side), since hard-rated issues often involve a real fault rather than a minor glitch.