HOW TO OPEN MIELE 251 VACCUUM: 1-Unplug from wall and disconnect power cord 2-Remove black switch panel at back of top panel: A-Use Phillips screwdriver, remove two silver screws visible between back of hinged top door and front of black switch panel
B-Push back of the panel down while pushing it forward (towards front of machine). There are two plastic notches and clips which are tightly fit together that you need to separate.
Once it releases, push it a bit more towards the front of the machine and lift off panel. It has wires connecting it to the main body so it will not remove completely.
C-Be careful not to lose the springs that simply sit inside of two plastic channels, one under each of the two switches. These are required for your witches to operate properly.
3-Locate screw at bottom of deep rectangular hole now revealed (under former location of black switch panels). Unscrew using Phillips screwdriver. 4-Open hinged top panel. Locate two silver screws, one on each side of main housing. Unscrew using Phillips screwdriver. 5-This will let you lift off the whole top assembly, door and main housing, revealing the plastic chassis and the motor unit within.
You now have access to the motor, wiring connector harnesses, circuit board and the cord reel.