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On the central heating setting the hot water temperature starts nice and hot but then falls steadily to a warmish level. On the DHW setting the water temperature is only warm. I changed the divertor valve as a result of some horrendous noises (water temperature was fine) but now no noise...

I have a Vokera Excell 80Sp and the pilot light keeps going out, however: In off position it remains lit. In either water or heating mode with no demand the light goes out. In heating mode, and demand from room stat, all is well. (Replaced thermocouple less than 2months) Can anyone...