Your issue is your Door Open MB (Main and Belly). The belly door has a switch on it, make sure it is connected and works (Belly door is the one where the lower glass panel is). The Main door typically has optics that verify closure. Also these machines have a "latch" that locks the main door. The latch must be in the closed position for the optics to line up. You may also have bad optics at work. Open the main door and look for the optics (they are long and black with 2 led emitters or receivers, about 10-15cm in length), there are two assemblies, one on the door and one along the edge of the door, these two assemblies need to line up when you close and latch the door.