LG Refrigerator Error Code E1

E1 on an LG refrigerator indicates a failure in the left compartment temperature sensor, identified as R1. The code is triggered when the main PCB detects a voltage at check point A on CON2 that falls outside the normal 0.5V to 4.5V operating range. A reading of 0V points to a shorted sensor, while 5V points to a disconnected or open circuit. The refrigerator cannot accurately regulate the left compartment temperature while this code is active.

Using the refrigerator with an active E1 code carries some risk to food safety because the left compartment temperature is no longer being monitored or controlled accurately. The compartment could run warmer than the set point without triggering a normal cooling response. It is best to address the error promptly and use a standalone thermometer to verify compartment temperatures if you must continue using the unit in the interim.

A power reset may temporarily clear the E1 code from the display, but if the underlying sensor fault is still present, the code will return once the control board runs its diagnostics again. Resetting is useful as a first step to confirm whether the fault is intermittent, but a permanent fix requires identifying and correcting the cause, whether that is a loose connector, a damaged harness, or a failed sensor or board component.

Some causes of the E1 error are DIY-friendly, particularly reseating a loose connector at CON2 on the main PCB or inspecting the wiring harness for obvious damage. If the thermistor itself has failed, replacing the R1 sensor is a moderate-difficulty repair that requires accessing the sensor, disconnecting the harness, and installing a compatible replacement part. Main PCB replacement is a more complex repair and is best handled by a qualified technician.

Repair costs vary depending on the root cause. If only a connector needs reseating, there may be no parts cost at all, though a service call fee typically ranges from $75 to $150. A replacement R1 thermistor sensor generally costs between $15 and $50 for the part, while a main PCB replacement can range from $150 to $400 or more for parts alone. Labor charges vary by region and technician.