Error code · Refrigerator

LG Refrigerator Code CO: Control and Display Link

CO, which may show as Er CO or E CO, appears on LG refrigerators with an LED or LCD temperature display. It means the main control board and the display are not communicating, and the problem…

Medium · inspection needed

(713) 597-5662

Code: CO
Appliance: Refrigerator
Brand: LG
Warranty: 30-day workmanship

What CO means

CO, which may show as Er CO or E CO, appears on LG refrigerators with an LED or LCD temperature display. It means the main control board and the display are not communicating, and the problem may be temporary, so the code sometimes clears after power is cut. The owner sees CO, and the panel may be blank, frozen, or unresponsive, while the refrigerator itself often keeps cooling in the meantime.

Common causes of CO

Connector between the main board and display
Display board
Main board communication output

✓ One safe check you can try

1. Unplug the refrigerator for about 5 minutes, then plug it back in to reset. 2. Check that the plug is firmly seated in the outlet. 3. Keep the doors closed during the wait so the food stays cold. 4. Press a panel key and see whether the display responds again. 5. If CO returns, request service.

! Why to stop there

A reset can clear a temporary link problem but cannot tell us which board or cable is behind it.
We test the link and quote any repair in writing before work starts.
If cooling is affected, we check that in the same visit.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Refrigerator codes

iTLG Refrigerator Code iT: Ice Maker Motor OdLG Refrigerator Code Od: Wi-Fi Module Link OFFMessage "OFF" on LG Refrigerators r2LG Refrigerator Code r2: Lower Compartment Sensor rFLG Refrigerator Code rF: Fresh-Food Fan Motor rSLG Refrigerator Code rS: Upper Sensor Open or Shorted rTLG Refrigerator Code rT: Room Temperature Sensor SbLG Refrigerator Code Sb: Sabbath Mode On

COCO questions

Is CO a real problem if it clears?

A single appearance may be temporary, and the manufacturer notes it may clear. If CO returns after the reset, there is likely a lasting link problem, and we trace the connection between the boards.

Will the fridge keep cooling with CO?

Often, yes, because cooling is handled separately from the panel in many cases. Check temperatures with a thermometer, though, and call us if either compartment starts to warm.

Can I use the display while CO shows?

The buttons may not respond. After the reset, test them again. If the panel stays dead or the code comes back, we should look at the display, its connector, and the main board.

Book a visit

Still seeing CO?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 597-5662