LG refrigerator Er CO code: communication error

The main control board and the display board are not communicating. A power reset sometimes clears it, but a lasting CO code usually points to a wiring fault or a failed board.

Likely causes

Listed from most to least common.

1. Brief power surge or outage confused the control boards
2. Loose wiring connector between the boards
3. Wiring damaged in the door hinge
4. Failed display board
5. Failed main control board

How to fix the Er CO code

Unplug the refrigerator or switch it off at the breaker before removing any panel or filter.

1. 1

   Step 1: Reset the power

   Unplug the refrigerator or switch off its breaker for about 5 minutes, then restore power.

2. 2

   Step 2: Use a direct outlet

   Plug the fridge straight into a wall outlet, not an extension cord or power strip.

3. 3

   Step 3: Check that it is cooling

   If the code returns, check whether the fridge still keeps food cold. Move food to a cooler if temperatures rise.

Parts that may need replacing

Check your model number on the label inside the door or on the back before ordering.

• LG refrigerator main control boardCheck prices
• LG refrigerator display boardCheck prices

When to call a technician

If CO stays after a reset, a technician needs to test the wiring and boards. LG lists this code as one that needs service.

A typical repair for this code costs $200–$500 in the US, including parts and labor. Prices vary by area and model.

Models this applies to

• French door refrigerators (LF, LR and LM series)
• Side-by-side refrigerators (LS and LRS series)
• InstaView Door-in-Door models
• Linear and inverter linear compressor models

Codes can differ slightly between models. Your owner's manual is the final word and is available from LG support.

Common questions