LG Refrigerator Error Code FreshFood Defrost Sensor Error

This error means the control board has detected a problem with the temperature sensor that monitors the defrost system in the fresh food compartment. The sensor signal voltage at Main PCB connectors CN30 pin 8 and CN76 pin 1 is outside the normal 1.0V to 4.5V range. The error is triggered to protect the fresh food section from overheating during defrost or from incomplete defrost cycles. The root cause is typically a failed sensor, damaged wiring, or connector corrosion.

Continued use is not recommended for an extended period because a faulty defrost sensor can lead to ice buildup on the evaporator, reduced cooling performance in the fresh food section, or an ineffective defrost cycle. Food safety could be compromised if temperatures are not maintained properly. It is best to diagnose and repair the fault as soon as possible.

A power reset may temporarily clear the error code from the display, but the code will return if the underlying fault in the sensor, wiring, or PCB has not been repaired. Resetting without addressing the root cause does not restore normal defrost operation. Use the reset only as a step to confirm whether the error reappears, not as a permanent fix.

A knowledgeable DIYer can attempt this repair by first checking the connector at CN30 and CN76 for corrosion or looseness and reseating the connections. If that does not resolve the error, the defrost sensor thermistor can be tested and replaced if it is faulty. Accessing the voltage test points and sensor requires some familiarity with refrigerator disassembly and basic electrical testing tools such as a multimeter.

If only the defrost sensor thermistor needs replacement, parts typically range from around 15 to 50 dollars depending on the specific model, and a DIY repair keeps costs low. If a professional technician is needed, total repair costs including labor generally range from 100 to 250 dollars. Replacing the Main PCB is the most expensive outcome, with parts and labor potentially ranging from 200 to 450 dollars or more.