LG Refrigerator Error Code Er IS: Ice Maker Sensor Error
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What Error Code Er IS Means
The Er IS code means the ice maker temperature sensor (thermistor) is reading outside its expected range. This sensor tells the main board when the ice maker mold is cold enough to begin a harvest cycle and when to fill with water. A bad sensor stops ice production because the board either never triggers a harvest or never opens the water valve to fill the mold.
Common Causes
Failed ice maker thermistor
The thermistor element opens or shorts internally. The board reads an impossible temperature and locks out ice production.
Corroded sensor connector
Moisture in the ice maker compartment corrodes the connector pins. Intermittent contact produces erratic readings and triggers Er IS.
Damaged sensor wiring
The thin wires from the thermistor run along the ice maker assembly and are vulnerable to ice buildup and mechanical stress. A broken wire creates an open circuit.
Ice maker assembly failure
On some LG models, the thermistor is built into the ice maker assembly and is not sold separately. A failure means replacing the entire ice maker module.
How to Fix It
- 1
Reset the refrigerator
Unplug the unit for 5 minutes. Plug it back in. Check if Er IS clears. If it does, monitor ice production for 48 hours. An intermittent sensor often fails again within that window.
- 2
Access the ice maker sensor
Open the freezer. Remove the ice bucket. Remove the ice maker cover panel (Phillips screws or clips). The thermistor is a small probe clipped to the ice maker mold or tray. On some models, it is integrated into the ice maker module.
Unplug the refrigerator before removing covers or disconnecting sensors.
- 3
Inspect the connector and wiring
Check the sensor connector for corrosion (green or white deposits). Clean corroded pins with electrical contact cleaner and a small brush. Trace the wires from the sensor to the harness, looking for breaks or damage. Repair any broken wires.
- 4
Test the thermistor
Disconnect the thermistor. Set a multimeter to the 20K-ohm range. At freezer temperature (approximately 0 degrees F), expect a reading of 14,000-18,000 ohms depending on your model. OL or 0 ohms means the sensor is bad. Consult your tech sheet for the exact expected resistance values.
- 5
Replace the sensor or ice maker assembly
If the thermistor is a standalone part, unclip the old one and clip the new sensor into the same position on the mold. If the sensor is integrated into the ice maker assembly, replace the entire ice maker module. Reconnect the harness and restore power.
When to Call a Professional
If the thermistor is integrated into the ice maker assembly, replacement requires removing the entire module and its water line connections. A technician ensures proper installation and tests the complete ice production cycle. TruePro's $59 diagnostic fee is credited toward the repair. We warranty all repairs for 90 days on parts and labor. CA License #51112. Same-day service is often available across LA County, Orange County, and Ventura County. Call 877-378-3111. First-time customers get 15% off labor with code NEW15.
Estimated Repair Cost
| Option | Estimated Cost |
|---|---|
| DIY (parts only) | $20 - $130 |
| Professional repair | $160 - $350 |
A standalone thermistor costs $20-$40. If the full ice maker assembly needs replacement, the part costs $80-$130. Professional range includes diagnosis, parts, and labor.
See full refrigerator repair cost breakdown βLG Refrigerator Er IS β FAQ
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