pull down front flap 2 screws located top of control panel one at either side.2 more screws located botom rear of outer casing have to look underneath 2 see them.front cover will now lift up and off.
tizaro, January 2011
look under the boiler case to the back inside edge. there is a screw just underneath the curved outer edge. both sides.
S.PRIESTLEY, January 2011
May I respectfully suggest, You're hardly likely to understand the workings inside if you can't even get the cover off the boiler. Why mess with things you obviously don't understand? You seem to present a danger to yourself and others.
Call out a gas safe engineer to legally do any work you require.
