LG Refrigerator Error Code DEFROSTING SENSOR OF CF COMPARTMENT

This error indicates that the defrost sensor in the CF (convertible freezer) compartment has reported a temperature outside the valid range of -58°F to 122°F. The fault can be caused by a cut wire, short circuit, loose connector, or a missing sensor housing. The refrigerator displays this code because it can no longer reliably control the defrost cycle in that compartment. Diagnosis starts by checking the voltage at Main PCB connector CN 30 pins 6 and 7, which should read between 1.0V and 4.5V.

Continued use is risky because the refrigerator cannot properly manage the defrost cycle in the CF compartment without a working sensor. This can lead to excessive frost buildup, reduced cooling efficiency, or in some cases continuous defrost heating. It is best to address the fault promptly to avoid food spoilage or further component damage.

A power reset may temporarily clear the error code from the display, but it will return as soon as the control system re-evaluates the sensor circuit. Because the fault is caused by a physical problem such as a broken wire, failed sensor, or bad connection, the underlying issue must be repaired before the error will stay cleared. Resetting is useful only as a first step to confirm whether the fault is intermittent or persistent.

Some causes, such as a loose connector, can be resolved without replacing any parts by unplugging and reseating the connector at the sensor and at the Main PCB. However, a broken wire, shorted harness, or failed sensor will require replacement parts and basic skills with a multimeter and appliance disassembly. If you are not comfortable working with wiring or internal refrigerator components, a qualified technician should perform the repair.

Repair costs vary depending on the root cause. A replacement defrost sensor typically costs between $15 and $50 for the part alone. If the wiring harness needs repair or replacement, parts and labor combined can range from $100 to $250 or more. A service call from a technician for diagnosis and repair generally adds $75 to $150 in labor costs depending on your location.