I have a megaflo CL170. With 2 problems. The first is that the water heats up to temperature but the temperature drops quite low before the boiler fires again. Also, intermittently, the boiler won't fire for the central heating once the hot water is up to temperature. For the intermittent problem I suspected the motorised valve??. Any suggestions would be very much appreciated. Boiler engineer happy to charge large call out fee but has no clue as to solution. Kevin
