Hi I have an Ariston e combi boiler which is always left powered on at my static caravan, probably used for a week every month on avg. No hot water at sink and when checked, no display on the boiler? Also found supply tripped. After a few basic power checks and looking at boiler diagrams, found that the 2amp quick blow fuse had blown. Replaced the quick blow fuse put power back on, still no display and the fuse is still intact? Any suggestions please.