LG Refrigerator Error Code d1

The d1 code means the control board has detected that the upper compartment defrost sensor is either disconnected or shorted. The sensor is a thermistor that tracks temperature during the defrost cycle, and its circuit is reading outside of normal expected values. This can result in improper defrost operation and eventual frost buildup if not addressed.

The refrigerator may continue running, but the defrost cycle for the upper compartment could be compromised. Over time, frost can accumulate on the evaporator coils, reducing cooling efficiency and potentially causing food spoilage. It is best to address the fault promptly rather than continue operating with the sensor fault active.

A power reset may temporarily clear the code from the display, but it will return if the underlying sensor fault is not corrected. The control board will re-detect the open or shorted circuit as soon as it resumes monitoring. A permanent fix requires repairing or replacing the faulty sensor, wiring, or connector.

In many cases, yes. Start by unplugging the refrigerator and inspecting the wiring connector for the upper defrost sensor to make sure it is fully seated and free of corrosion. If the connector looks good, the thermistor can be tested with a multimeter and replaced if it shows an open or shorted reading. Replacing a defrost thermistor is a relatively straightforward repair for someone comfortable working with appliance components.

If only the defrost thermistor needs replacement, parts typically range from $10 to $40 depending on the specific model. If a technician performs the repair, total costs including labor can range from $80 to $200. Wiring harness replacement or control board repair would push costs toward the higher end of that range.