LG Refrigerator Error Code Er (Ice Removal Sensor)

The Er error code on an LG refrigerator indicates a fault in the ice-making sensor, specifically identified as a snapping (open circuit) or short-circuit condition within that sensor. This sensor monitors temperatures within the ice maker assembly to regulate the ice production and harvest cycle. The code is displayed during an LED diagnostic check, meaning it surfaces as part of the refrigerator's built-in self-test routine rather than always appearing during normal operation. When the control board detects that the sensor signal has fallen outside its expected resistance range, it logs this fault.

The ice-making sensor is a thermistor, a resistive temperature-sensing component whose resistance value changes predictably with temperature. A break in the sensor's wiring or the sensor element itself causes an open circuit, while damaged insulation or a failed sensor can cause a short circuit. Either condition produces a signal the control board cannot interpret as a valid temperature reading. The first diagnostic step is to measure resistance at the CON8 connector terminals, which provides direct confirmation of whether the sensor or its wiring harness is responsible for the fault.

Common contributing factors include physical damage to the sensor from ice buildup pressing against wiring, connector corrosion at CON8, or simple component failure over time. Because this code only displays during the LED check mode, technicians should run the diagnostic cycle intentionally to confirm the fault before beginning component-level testing. Resistance measurements at CON8 will reveal whether the circuit is open, shorted, or reading within an acceptable range for the ambient conditions.