i have just replaced a new programmer which i believe to be correct, and set the haeting and hot water to default settings and everything was fine, then we changed so that the hot water would come on at different times and the water is scoulding hot i think all the time, when the heating and water are off at the programmer the valve is in the HWS position is this correct, and when hot water is switched on the valve keeps clicking, can anyone help please,
