LG Refrigerator Error Code rt E

The rt E code indicates an ambient or defrost sensor error. The Main PCB has detected that the ambient temperature sensor has a short circuit, an open circuit, or a resistance reading outside the acceptable range. This fault affects the refrigerator's ability to properly manage the defrost cycle and can lead to cooling problems if not corrected.

The rt E error is not a safety hazard in the traditional sense, but it can compromise the refrigerator's ability to maintain safe food storage temperatures. A disrupted defrost cycle can lead to heavy frost buildup and reduced cooling, which may cause food spoilage. It is best to address this error promptly rather than continuing to rely on the appliance.

Repair costs depend on which component has failed. Replacing the ambient or defrost sensor typically costs between $50 and $150 for parts and labor. If the Main PCB requires replacement, costs can range from $200 to $400 or more depending on the model and labor rates in your area. Starting with the connector inspection at CON7 costs nothing and may resolve the issue without any parts expense.

A knowledgeable DIYer can start by checking the wiring connector at CON7 Pin 11 to Pin 12 on the Main PCB, as a loose connection is the most common cause. If reseating the connector does not clear the code, testing the sensor and wiring harness with a multimeter is the next step. Replacing the sensor is a straightforward repair, but if the Main PCB is at fault, professional diagnosis is recommended before purchasing a board.

A reset may temporarily clear the rt E code, but the code will return if the underlying fault in the sensor, wiring, or connector has not been corrected. Resetting without repair does not fix the problem and can delay proper diagnosis. Address the root cause at CON7 Pin 11 to Pin 12 or the sensor itself before relying on a reset.