LG Refrigerator Error Code Freezer Defrost Function Error

This error means the defrost system in the freezer compartment has a detected fault. The control board has determined that the defrost heater, bimetal thermostat, or thermal fuse has failed, or that the defrost cycle ran for the full 70-minute maximum without completing successfully. Left unaddressed, frost will accumulate on the evaporator coils and reduce the refrigerator's ability to cool properly.

Continued use with an active defrost error is not ideal, as frost buildup on the evaporator coils will progressively reduce cooling efficiency in both the freezer and fresh food compartments. Food safety can become a concern if temperatures rise above safe thresholds. It is best to address the error promptly rather than continuing to operate the appliance without repair.

Resetting the refrigerator by unplugging it may temporarily clear the error code from the display, but the underlying defrost system fault will remain. If the heater, thermal fuse, or bimetal thermostat has failed, the error will return once the control board runs the next defrost cycle and detects the problem again. A proper repair of the failed component is required to permanently resolve the error.

A knowledgeable DIYer can perform the resistance test at connectors CN70 and CN71 with a multimeter to identify whether the heater, thermal fuse, or bimetal thermostat has failed. Replacing those components is a manageable repair if you are comfortable working inside a refrigerator and disconnecting electrical connectors. However, if the wiring or main PCB is involved, professional service is recommended.

Repair costs vary depending on which component has failed. A thermal fuse or bimetal thermostat are relatively inexpensive parts, typically in the range of $5 to $30 each, though labor costs will add to the total if a technician is hired. A defrost heater assembly may cost between $20 and $80 in parts. If the main PCB is at fault, costs can range from $100 to $300 or more for parts alone.