hi there i have a alpha cb28x with a drayton scr wireless system and well fed up with it. moved house 8 mouth ago the boiler puts the radiators on got hot water take them of no hot water. here is the tricky bit when you get plumber round he says there's nothing wrong he puts hot water on with the radiators of. and there is hot water he goes a way with 30 pound in back pocket 1 or 2 hours later put the hot water tap on no hot water if put the radiators on then we have hot water again the thing is i have hot water for about 1 hour after you turn the radiators of .can any 1 help