Trust this to happen on one of the coldest nights of the year. Our central heating (oil) boiler has a 'Drayton Tempus 4' controller. It is quite old, I think probably 15 years maybe. The clock / timer occasionally throws a wobbly and flashes and we just usually re-set it. But this time, today, the clock won't re-set - just when you press the buttons it reads 5.55 6.66 7.77 and so on when you press different buttons. We've checked the fuse, but not that. Is it broken? Or is there something we could try? Any advice really appreciated. thank you very much.