My LG washing Machine Model F1203CDP has error DE
DE is usually related to the door. It could be a broken hinge, a faulty door magnet, a door not properly closed or an overloaded machine that is applying too much pressure to the door.

It can also be a drain issue. Using a floor drain is acceptable as long as you also have a standpipe that is at least 3 feet high. Otherwise, the water would run out of the washer when the water level inside the machine reaches the height of the standpipe. If your hose is too low or something is restricting the water flow, that could be throwing the code.