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LG Refrigerator Error Code Er CO
Communication error. Er CO is a communication error between the main control board and the display. It can follow a power surge or a loose harness connection.
- Code: Er CO (also shown as CO)
- Appliance: LG refrigerator
- Owner fix: Often fixable with the safe checks on this page. Call a pro if the code comes back.
- Repair cost: call for a quote
- Checked against the manufacturer sources below on October 27, 2026
Likely causes
- Power surge or outage
- Loose wiring between the display and main board
- Display or main board fault
Safe checks you can do
Safety: Owner checks only. Do not open the sealed refrigerant system, remove electrical covers, or bypass parts. Compressor and refrigerant work needs a licensed technician.
- Unplug the fridge for 5 minutes and restart.
- Plug directly into a wall outlet with no extension cord.
When to call a pro
- The code returns after the restart
- Any time you smell burning or gas, see sparks, or would need to open a panel
What does it cost to fix?
Call for a quote. Repair costs depend on the brand, the model, the part and the shop, so this site does not publish price ranges. Ask each shop for its diagnostic or trip fee and a written quote after diagnosis. See what affects repair cost.
Sources
Codes and steps vary by model. Your owner's manual and the model sticker inside the door or on the back are the final word for your exact unit.
Other LG fridge codes
Refrigerator codes from other brands
See also: Refrigerator help in Idaho · Fridge not cooling · Freezer works, fridge warm · Ice maker not working · Fridge leaking water · All error codes
FAQ
What does LG error code Er CO mean?
Communication error. Er CO is a communication error between the main control board and the display. It can follow a power surge or a loose harness connection.
Can I fix LG code Er CO myself?
Often fixable with the safe checks on this page. Call a pro if the code comes back. Owner checks only. Do not open the sealed refrigerant system, remove electrical covers, or bypass parts. Compressor and refrigerant work needs a licensed technician.
How much does it cost to fix LG code Er CO?
Call for a quote. Repair costs depend on the brand, the model, the part and the shop, so this site does not publish price ranges. Ask each shop for its diagnostic or trip fee and a written quote after diagnosis.
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