LG Refrigerator Error Code F-112

F-112 is a freezer defrost heater error, meaning the refrigerator has detected a problem with the circuit that powers the defrost heater on the freezer evaporator coils. The fault can be caused by a loose or disconnected wire harness connector, a cut wire, a blown thermal fuse, a failed heater element, or a defrost cycle that ran for more than 70 minutes without completing. The primary diagnostic step involves testing the resistance between specific wires at the main PCB connectors CN70 and CN71, where a healthy circuit should measure approximately 55 ohms.

The error itself is not an immediate safety hazard, but it does mean the freezer is not defrosting correctly. Over time, frost will accumulate on the evaporator coils, restricting airflow and causing the refrigerator to stop maintaining safe food storage temperatures. The issue should be diagnosed and repaired promptly to avoid food spoilage.

Performing a reset by unplugging the refrigerator for a few minutes may temporarily clear the error code from the display, but it will not fix the underlying electrical fault or component failure. The code will return once the refrigerator runs through its next defrost cycle if the problem has not been corrected. A proper repair requires identifying and resolving the specific cause, whether that is a wiring issue, a blown thermal fuse, or a failed heater element.

Some causes of F-112 can be addressed without replacing parts, such as reseating a loose connector at CN70 or CN71 on the main PCB. However, diagnosing the fault properly requires a multimeter to test circuit continuity and resistance. If the thermal fuse or heater element has failed, those parts will need to be replaced, which involves accessing the freezer evaporator compartment by removing interior panels.

Repair costs vary depending on the root cause. If only a wire harness needs to be reseated, there is no parts cost. Replacement thermal fuses and defrost heater elements typically range from 15 to 60 dollars in parts. If professional repair service is needed, total costs including labor can range from 100 to 300 dollars or more depending on your location and the specific parts required.