LG Refrigerator Error Code ER ND — What It Means & How to Fix It

What Does This Error Mean?

The ER ND error means a communication fault has been detected between the main control board and a secondary board inside your LG refrigerator. The boards cannot talk to each other properly. This can affect display functions, dispenser operation, or temperature control.

Affected Models

LRMVS3006S
LRFVS3006S
LFXS26973S
LMXS30796S
LG French door refrigerators with SmartThinQ or InstaView

Common Causes

Loose or disconnected wiring harness connector between the main board and a sub-board
Power surge or brownout corrupting the communication signal between boards
Damaged wiring harness (pinched, chewed, or corroded wire)
Failed secondary control board (display board or dispenser board)
Main control board fault causing it to lose communication with connected boards

How to Fix It

Unplug the refrigerator for 5 minutes, then plug back in.

A hard reset clears communication faults caused by power fluctuations. This is the first and most often successful fix for ER ND.
Check if the refrigerator is still cooling normally.

If temperatures are normal and only the display or dispenser is affected, the fault is in the communication to those modules rather than the cooling system.
Check the power outlet and consider using a surge protector.

If the ER ND appeared after a power surge or outage, the boards may have been confused by unstable power. A surge protector prevents this from happening again.
If ER ND returns after reset, do not attempt to open the refrigerator to inspect boards yourself.

Refrigerator control boards are mounted in locations that require disassembly. There are also capacitors that can hold charge after unplugging.
Schedule a technician to diagnose the communication fault.

Provide the ER ND code and your model number. The technician will use LG's diagnostic mode to pinpoint which board or connection has failed.

When to Call a Professional

If a reset does not clear ER ND, the wiring or one of the boards needs professional diagnosis. A technician can test communications with diagnostic tools. Expect costs of $150–$400 depending on which board requires replacing.

Frequently Asked Questions

Will my LG refrigerator still keep food cold with the ER ND error?

Usually yes — ER ND typically affects communication to display or dispenser boards, not the core cooling system. However, if the main board loses communication with the compressor control, cooling could be affected. Monitor temperatures closely and act quickly if things start warming up.

Can a power surge cause ER ND on an LG refrigerator?

Yes — power surges are one of the most common causes. The communication protocol between boards is sensitive to voltage spikes. A simple unplug-and-reset often resolves surge-related ER ND errors. Install a surge protector to prevent future occurrences.

How much does it cost to fix an ER ND error on an LG refrigerator?

If a reset fixes it, the cost is zero. If a control board needs replacing, parts range from $80–$250 and labor adds $100–$200. LG's warranty covers board failures for 1 year on parts and labor. Call LG at 1-800-243-0000 to check your warranty.