LG Refrigerator Error Code RT sensor failure

RT sensor failure means the refrigerator's room temperature sensor has a detected wiring fault, either a cut (open circuit) or a short circuit in the sensor's connecting wires. The control board can no longer receive a valid signal from the sensor. You will notice that all display LEDs are on, but both the Freezer and Refrigerator temperature readouts are blank.

The refrigerator may continue running, but it cannot properly adjust its operation based on ambient conditions without a functioning RT sensor. This could affect efficiency and temperature stability over time. It is best to diagnose and resolve the fault promptly rather than leaving the unit running indefinitely with the error active.

A reset may temporarily clear the error from the display, but it will return if the underlying wiring fault or sensor failure has not been repaired. The control board will detect the same out-of-range signal on the next diagnostic cycle and re-trigger the code. A permanent fix requires identifying and correcting the physical cause of the fault.

In many cases, yes. Start by inspecting the wiring connected to the RT sensor for visible damage, loose connections, or corrosion at the connector. If a wire is broken or shorted, a repair or harness replacement may resolve the issue. If the sensor itself has failed, replacing the sensor is a straightforward repair for someone comfortable working with appliance components and a multimeter.

If only a wire repair or connector reseating is needed, costs are minimal, mostly your time and possibly a small amount for materials. If the RT sensor itself needs replacement, parts typically cost in the range of $15 to $50 depending on the model. Adding professional labor, the total repair cost generally falls in the range of $80 to $200.