When I open a tap (with the boiler controls set to DHW and CH) there is no hot water. If I turn up the room stat the burner flame comes on and I have hot water out of the taps. I was told that it was a diaphragm problem. I took the only diaphragm out that I could find but that appeared OK. The...
Now I am really confused. I have a diaphram that was sold as a DHW diaphram. I can't find anywhere to fit it in the boiler. I have found a much smaller diaphram which I believe is for the CH. Please can you put me straight? Much appreciated.