Isolate Mains Power to appliance as per TOPs P4
G.C. Number 47 980 07
Case removal
Remove two screws (A) bottom rear of boiler.
Remove screw (B) centre of lower front panel.
Remove thermostat knob and ignition push button.
Remove case by easing forward at bottom and lifting off lugs at top.
If necessary, remove the lower control cover (4 screws) and lift off the upper front panel before removing case.