The timer on my central heating has stopped working, its one of the older analogue clocks with little switches around the face for on/off. How easy is it to replace? Are the newer timers wired the same?
Do a search for previous threads on central heating/immersion timers for some more useful info. If you can do basic wiring jobs then with a bit of care you should be able to do the job yourself. If in any doubt get a professional on the job. Obviously isolate all circuits before working on them!