LG Refrigerator Error Code FD

The FD error code indicates a problem with the freezer defrost sensor located on the evaporator. If the display shows 'Lo' with the FD code, the sensor circuit is open or disconnected. If it shows 'Hi', the sensor has short-circuited. In both cases, the refrigerator cannot accurately monitor evaporator temperature during the defrost cycle.

A power reset may temporarily clear the FD error from the display, but the code will return if the underlying sensor fault is still present. The sensor circuit must be tested and the faulty component replaced to permanently resolve the error. Repeated resets without repair will not restore proper defrost function.

If the FD sensor itself needs replacement, parts typically range from roughly $15 to $50 depending on the specific model. If a professional technician is needed for diagnosis and replacement, total repair costs including labor generally range from $100 to $250. Costs can be higher if the Main PCB is found to be faulty instead of the sensor.

A knowledgeable DIYer can perform the resistance check by disconnecting connector CN15 on the Main PCB and measuring across the sensor terminals with a multimeter. If the sensor reads as open or shorted, the FD sensor on the evaporator needs to be replaced. Accessing the evaporator requires removing freezer shelving and the rear panel, which is manageable but does involve working around electrical components and refrigerant lines.

Operating the refrigerator with an active FD error is not recommended for extended periods. Without a functioning defrost sensor, the defrost cycle cannot be properly controlled, which can lead to excessive frost buildup on the evaporator, reduced cooling performance, and potential strain on other components. Food safety may be affected if cooling becomes inadequate.