LG Refrigerator Error Code D sensor

The D sensor error means the refrigerator's control board has detected an abnormal condition in the defrost temperature sensor circuit, specifically a short circuit or open circuit. This sensor monitors evaporator temperature during the defrost cycle and is wired into the main PCB through connector CON6 via orange wires. The error prevents the refrigerator from properly managing defrost, which can lead to ice buildup and reduced cooling over time.

The error is not an immediate safety hazard, but ignoring it will degrade refrigerator performance over time. Without a functioning defrost sensor, the automatic defrost cycle cannot terminate correctly, allowing ice to accumulate on the evaporator coils. Heavy ice buildup restricts airflow, forces the compressor to work harder, and can eventually result in complete loss of cooling.

A power reset may temporarily clear the error code from the display, but if the underlying sensor circuit fault still exists, the code will return once the refrigerator runs through diagnostics again. A reset is not a fix for this error. The root cause, whether a loose connector, a failed sensor, or damaged wiring, must be identified and corrected to permanently resolve the D sensor error.

A knowledgeable DIYer can perform the initial diagnostics, including removing the PCB cover, checking the CON6 connector for loose connections, and measuring resistance across the orange wires with a multimeter. If the connector is simply loose, reseating it may clear the error without any parts. However, if the sensor or wiring harness needs replacement, some comfort with appliance disassembly is required, and working near electrical components means the refrigerator should be unplugged before any hands-on inspection.

If the issue is only a loose connector at CON6, there is no parts cost at all. A replacement defrost temperature sensor typically costs between $15 and $50 depending on the specific model. If a technician is needed for diagnosis and replacement, total repair costs including labor generally range from $100 to $250. Replacing the main PCB, which is only necessary in rare cases, would be significantly more expensive.