LG Refrigerator Error Code F-1-ⓐ

The F-1-ⓐ code means the refrigerator has detected a problem with the ambient temperature sensor, the sensor that monitors the air temperature around the outside of the unit. The error activates when the sensor reports a temperature above 149°F (65°C) or below -58°F (-50°C), both of which indicate a sensor or wiring fault rather than an actual temperature extreme. Common causes include a loose connector at the main board, a broken wire, or a failed sensor.

A reset may temporarily clear the code, but if the underlying fault in the sensor, wiring, or connector is not corrected, the error will return once the control board re-evaluates the sensor signal. Resetting without fixing the root cause does not restore reliable operation and can mask a problem that affects cooling performance.

Repair costs depend on the root cause. A replacement ambient temperature sensor typically runs in the range of $15 to $50 for the part alone. A new wiring harness can range from $20 to $80 depending on the model. If the main PCB is at fault, board replacement can cost anywhere from $100 to $300 or more for the part, with additional labor costs if a technician is involved.

Some steps are DIY-friendly, particularly checking whether the connector at CN31 on the main PCB is fully seated, since a loose connector is among the most common causes. If that does not resolve it, testing sensor resistance requires a multimeter and the ability to interpret a resistance-to-temperature table. Replacing the sensor or wiring harness is within reach for experienced DIYers, but main PCB replacement is generally best handled by a qualified technician.

The refrigerator may continue to run while this code is active, but without accurate ambient temperature data the control board cannot optimize cooling performance correctly. Food safety could be affected if the unit begins to underperform. It is best to diagnose and correct the fault promptly rather than rely on the appliance to maintain safe temperatures indefinitely.