Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Case removal
Remove the controls cover by opening the door covering the securing screws on the underside of the controls cover. Undo securing screw, pull controls cover forward 10mm, lower it to release it from its four side fixings and pull forward clear of the thermostat knob.
Remove the door by undoing the lower fixing screws and lift the door off the two upper hinge brackets.