LG Refrigerator Error Code E 27

E 27 on an LG RSG5B-series refrigerator indicates a damper heater error, specifically that the control board has detected the damper heater circuit as open. The damper heater prevents ice from blocking the air vent between compartments. The fault can be caused by a failed heater element, broken wiring, or a loose terminal at connector CN73 on the main PCB.

Continued use is not recommended without addressing the fault. The damper heater prevents ice from blocking the air vent, and without it functioning correctly, airflow between compartments can become restricted. This can lead to uneven temperatures, food spoilage in the fresh food section, and potential ice buildup that worsens over time.

Repair costs depend on the root cause. If only a terminal needs reseating, the fix may cost little to nothing beyond a service call fee, which typically ranges from $75 to $150. Replacing the damper heater assembly generally costs between $40 and $120 for the part, plus labor. A wiring harness repair or main PCB replacement would increase the total cost, potentially ranging from $200 to $400 or more depending on parts and local labor rates.

Start by disconnecting connector CN73 on the main PCB and measuring resistance between the Black and Brown wire terminals with a multimeter. A reading of infinite resistance points to an open circuit from a failed heater or broken wire, while 0 ohms indicates a short. Based on the reading, inspect the connector terminals for backing out, trace the wiring harness for damage, and replace the damper heater assembly or repair the wiring as needed.

A power reset may temporarily clear the error code display, but it will not resolve the underlying fault. If the heater circuit remains open or shorted, the E 27 code will return once the control board runs its diagnostic cycle again. A proper repair of the heater, wiring, or connector is required for the code to clear permanently.