no heat or no water problems are very common on this boiler, usually due to the wax capsule diverter valve being faulty. the valve tends to stick in one position or the other so either ch or hw wont work. the diverter valve is still available, i fitted one last week. not always that easy to replace so may put off some people who can't be bothered with the hassle. usually best to change the pump at the same time as when one goes the other usually will soon after.
Ian, February 2010