LG Dishwasher Error Code F-1

The F-1 code on an LG dishwasher indicates a door circuit board component failure. The microprocessor has detected a fault in the door circuit, which causes the dryer to stop working. The washing portion of the cycle may still run, but drying will be inoperative until the fault is corrected.

The dishwasher may still complete a wash cycle with F-1 active, but the drying function will not operate, so dishes will come out wet. Continued use is generally not harmful to the machine in the short term, but running it repeatedly with a board fault present is not advisable. Arrange for repair before relying on the unit for regular use.

A power reset by unplugging the dishwasher for several minutes will not clear the F-1 error permanently because the fault is tied to a failed board component, not a temporary software glitch. The error will return once the unit powers back on and the microprocessor runs its self-check. A physical repair of the door circuit or board replacement is required to resolve it.

LG's service procedure for F-1 starts with replacing the microprocessor board, as the fault points to a board-level failure in the door circuit. Before purchasing a board, check the door circuit wiring harness and connectors for damage, corrosion, or loose connections, since a wiring issue can produce the same error. If the wiring checks out, the board replacement is the correct repair. A technician with appliance electronics experience can complete this job, though it is a more involved repair than a simple component swap.

Replacement microprocessor boards for LG dishwashers typically range from $80 to $200 for the part, depending on the model. If you hire a technician, expect labor costs of $100 to $200 on top of the part, bringing the total repair to roughly $180 to $400. DIY replacement is feasible if you are comfortable working with appliance electronics and disconnecting wire harnesses, and it significantly reduces the cost.