The F-DL door lock error may indicate an inability to open the door, trapping your damp clothes inside. This first step is optional, and explains how to release the door lock manually.

Using a Torx T20 screwdriver or a 9/32" socket wrench or driver, remove the three screws along the bottom front of the washer, and remove the panel.

Reach up inside the right hand side behind the door latch, and you should be able to feel a 1" diameter ring. Grab the ring with your fingers, and pull it down toward the floor. It will release the door lock.