LG Refrigerator Error Code Er CH — What It Means & How to Fix It

What Does This Error Mean?

The Er CH error means your LG refrigerator has a communication fault between internal components. The control boards are not communicating correctly. Cooling may continue but some functions may not work.

Affected Models

LRMVS3006S
LRFXS2503S
LRFDS3006S
Most LG French door refrigerators with inverter compressors

Common Causes

Loose or unplugged wiring harness between the main board and sub-board
Power surge or brownout disrupting the communication circuit
Main control board has developed a fault
Sub-board (display board or inverter board) has failed
Moisture or condensation causing a short in a wiring connector

How to Fix It

Unplug the refrigerator for a full 5 minutes.

A longer power-off cycle fully discharges the control boards and may clear the fault.
Plug the fridge back in and wait 3–5 minutes.

Watch the display. If it shows normal temperature readings, the reset worked.
Check if both compartments are cooling normally.

Feel inside the fridge and freezer. Both should feel cold within 10–15 minutes.
If Er CH returns, check the back of the fridge for loose wiring harnesses.

Locate the wiring at the bottom rear near the compressor area. Reseat any loose connectors.
If the error persists after reseating connections, call a technician.

One of the control boards likely needs replacement.

When to Call a Professional

Board communication faults require professional diagnosis. Determining which board has failed needs specialized test equipment. Repair costs range from $150–$400 depending on which board is replaced. Contact LG support or a certified appliance technician.

Frequently Asked Questions

Will my LG refrigerator stop cooling with the Er CH error?

Not necessarily — the cooling system may keep running despite the communication fault. But you can't rely on temperature readings or controls until repaired. Check the compartments directly to assess food safety.

Can a power outage cause the Er CH error on an LG refrigerator?

Yes. Power surges during an outage can disrupt board communication. A 5-minute power reset often resolves it. If the error persists after multiple resets, a board may have been damaged.

How much does it cost to fix the LG refrigerator Er CH error?

A power reset costs nothing. Control board replacement ranges from $150–$400 with labor. Get a technician to diagnose which board is faulty before ordering any parts.