I have a worcster CDi boiler that only gives hot water when the heating is on. If the heating is off then the water takes ages to get warm. If I turn on the cold tap in the sink when having a shower the water then gets hot in the shower. To fill the bath I must run the tap extremly slowly. Can anyone help

Neil, March 2008

sounds like ur diaphragm is on the way out also poss blocked plate heat exchanger.. the heat ex has 2 be removed 2 replace the diaphragm so it can be washed thru then

matt, March 2008