LG Er CO — LG Freezer Er CO — Communication Error
What This Code Means
The main control board and the display board have lost communication. On LG bottom-freezer and French-door models, this can cause the freezer and fridge to stop responding to controls.
Common Causes
- Loose or damaged ribbon cable between the control board and display
- Power surge or brownout affecting board communication
- Failed main control board
DIY Steps to Try First
- Unplug the refrigerator for 5 minutes, then plug back in — power cycles often clear Er CO caused by transient surges.
- Check that the unit is plugged directly into a wall outlet, not a power strip or extension cord.