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I don't like (understand) theCH boiler in my son's house, so I suggested they get British Gas to quote for a new combi (and get rid of header tank etc). BG say they don't recommend a combi boiler for a family (2 adults 2 young children) because of hot water demand! I've had a combi for...

can anyone please help? I have just replaced a 3 port central heating/hot water valve with a new Wickes model and wired it in as the previous one. 4 wire + earth (Blue/Orange/Grey/White/Green-Yellow). The valve appears to control the water OK but the internal drive motor is too hot to touch...