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

What Does This Error Mean?

The Er CI error means the ice maker's temperature sensor (thermistor) has malfunctioned. The fridge cannot accurately read the temperature inside the ice maker compartment. Ice production may stop or become unreliable.

Affected Models

LRMVS3006S
LRFXS2503S
LFXS26973S
LRMVS3006D
Most LG French door refrigerators with ice makers

Common Causes

Ice maker thermistor (temperature sensor) has failed — open or short circuit
Wiring connector to the ice maker sensor has come loose or corroded
Ice or frost buildup has damaged or displaced the sensor
Ice maker control board has a fault affecting sensor reading
Main refrigerator control board communication error with ice maker module

How to Fix It

Turn the ice maker off using the switch in the freezer.

Allow the ice maker to thaw for 24 hours — frost around the sensor can cause false errors.
After 24 hours, turn the ice maker back on.

If the error clears, frost was likely blocking the sensor.
Unplug the refrigerator for 5 minutes and restore power.

This resets the ice maker control module and may clear a temporary sensor error.
Monitor the ice maker for 24–48 hours to see if normal ice production resumes.

It can take up to 24 hours for a reset ice maker to start producing again.
If the Er CI error returns, the thermistor or its wiring needs professional testing and replacement.

A technician can check thermistor resistance with a multimeter in minutes.

When to Call a Professional

An ice maker thermistor replacement is a straightforward repair for a qualified technician. If left unrepaired, the ice maker may produce hollow, small, or no ice cubes at all. Expect repair costs of $90–$180 for a thermistor or sensor harness replacement.

Frequently Asked Questions

Will the rest of my LG fridge work with an Er CI error?

Yes — the main refrigerator and freezer compartments continue cooling normally. Only the ice maker function is affected. You can safely continue using the fridge while you arrange a repair.

How is Er CI different from Er IS on an LG refrigerator?

Both relate to ice maker sensor faults. Er CI typically points to the ice maker compartment inlet sensor. Er IS refers more broadly to ice maker sensor communication. A technician can pinpoint which sensor is affected through testing.

How much does it cost to fix the Er CI error?

The thermistor part is inexpensive — typically $15–$35. Labor to access and replace it runs $60–$140. Total costs are usually $90–$180, making it one of the more affordable ice maker repairs.