LG Refrigerator Error Code LED 1 blink

LED 1 blink on an LG refrigerator indicates a Compressor AD Offset Error, also called an FCT0 error. This means the main control board has detected an out-of-range reading from the motor voltage and current sensors while the compressor is in the off state. The board flags this error because it cannot reliably monitor compressor operation without accurate sensor baselines. The fault is most commonly caused by a problem with the main control board itself.

Start by unplugging the refrigerator for several minutes to perform a full power reset. If the error does not return, continue monitoring the unit for normal performance. If the LED 1 blink error reappears, the main PCB requires replacement, as the internal AD offset sensing circuitry is faulty. Also inspect the wiring harness connectors at the main board for any loose or corroded connections before replacing the board.

If the issue is resolved by a power reset, there is no parts cost involved. If the main control board requires replacement, parts alone typically range from around $80 to $250 or more depending on the specific model. Adding professional labor for diagnosis and installation could bring the total repair cost to a range of $150 to $400 or higher. Getting a quote from a certified technician before proceeding is advisable.

A power reset is the recommended first step and may clear the error if it was triggered by a temporary electrical glitch. Unplug the refrigerator for a few minutes, then restore power and monitor for the error. If the LED 1 blink error returns after the reset, the main control board will need to be replaced, as the fault is not a transient issue.

This error indicates the control board cannot accurately monitor compressor voltage and current, which means the refrigerator may not cool reliably or may run the compressor without proper oversight. It is not recommended to leave the unit running unattended with this fault active, as cooling performance may be compromised. Address the error promptly to avoid potential food spoilage or further damage.