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Have a Potterton Profile and Switchmaster 850. Since trying to use heating as well has hot water a few weeks ago, the water stops heating and the heating comes on when I press water constant. Previously after alot of switching on and off the water heated so long as I didnt turn the heating on...

Whenever I use the heating, it takes a while to get the hot water to heat. When I press water constant, the heating comes on for ages. I have to keep turning it on and off and hope for the water to come on without knowing when it will. This usually happens after I haven't used the heating for...