LG Refrigerator Error Code E rt

The E rt code indicates a fault with the room temperature sensor, also called the ambient temperature sensor. The main control board has detected a short, open circuit, or an out-of-range resistance reading from that sensor. This sensor helps the refrigerator regulate its cooling cycles based on the surrounding environment. The error requires inspection of the sensor, its wiring, and the connector at CON5 pins 13-14 on the main PCB.

The refrigerator may continue to run with the E rt code present, but its ability to optimize cooling based on room conditions may be compromised. Food safety depends on whether the refrigerator is maintaining correct internal temperatures, so monitor those closely with a thermometer. It is best to address the error promptly rather than leaving it unresolved for an extended period.

A power reset may temporarily clear the E rt code, but the error will return if the underlying fault with the room temperature sensor or its wiring has not been fixed. Resetting the unit is useful for confirming whether the fault is intermittent, but it is not a lasting solution. A proper repair requires diagnosing and correcting the sensor, connector, or wiring issue causing the fault.

Many cases of the E rt error can be resolved without professional help by inspecting and reseating the connector at CON5 pins 13-14 on the main PCB. If the connection looks clean and secure, the next step is testing or replacing the room temperature sensor, which is a relatively accessible component. However, if the fault points to the main PCB itself, that replacement is more involved and may benefit from professional service.

If the fix is simply reseating a loose connector, the repair costs nothing beyond your time. A replacement room temperature sensor typically costs in the range of $15 to $50 for the part. If a wiring harness or main PCB replacement is needed, total repair costs including labor can range from $100 to $400 or more depending on the specific model and service rates in your area.