The FE fault code appears when your dishwasher gets more water than it should. Not unlikely, the inlet valve is not working properly. It is located at the bottom of the dishwasher, right behind the kick panel. It is directly connected to the main water supply line, and it has two electric wires. Faulty inlet valves cannot be replaced. If yours proves faulty, you will have to buy a new one.
Other LG dishwasher error code: