LG Refrigerator Error Code 24

Error code 24 on an LG refrigerator signals a problem with the freezer defrost heater circuit. It activates when the defrost cycle fails to complete within 120 minutes, or when the control board detects a short circuit, open circuit, wiring fault, or defective thermistor in the defrost system. Diagnosis starts by checking continuity between the White and BLK wires at the MAIN PCB CN70 connector to identify whether the fault is a short or an open circuit.

A refrigerator displaying error code 24 may continue to cool for a period, but frost will progressively build up on the evaporator coils as defrost cycles fail. This will eventually block airflow and cause both the freezer and fresh food compartments to lose cooling ability. It is best to address the fault promptly to avoid food spoilage and potential secondary damage to other components.

Resetting the refrigerator by unplugging it for a few minutes may temporarily clear the error code display, but it will not resolve the underlying fault. If the heater, thermal fuse, bimetal, thermistor, or wiring has a physical defect, the code will return once the control board runs the next defrost cycle. A reset is only useful after the actual faulty component has been identified and repaired or replaced.

Some causes of error code 24 are accessible to a knowledgeable DIYer. Checking and reseating the CN70 connector requires no special tools and costs nothing. Testing the heater, thermal fuse, bimetal, and thermistor with a multimeter is also straightforward if you are comfortable working around appliance wiring. However, accessing the evaporator and its components requires removing freezer panels, and if a heater or thermistor needs replacement, you should be comfortable with basic appliance disassembly before attempting the repair.

Repair costs vary depending on which component has failed. A defrost heater assembly typically costs between $20 and $60 for the part, a thermal fuse or bimetal thermostat generally runs $5 to $25, and a defrost thermistor is usually in the $15 to $40 range. If you hire a technician, labor charges will add $80 to $200 or more depending on your location and the complexity of the repair.