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Thanks very much for your help. I haven't done anything but it all seems to be working ok again now.

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...

Thank you again, I think the safe thing for me to do is to get an engineer in :)

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.

Hi Can somebody please tell me where this diaphragm is located in an M9OE 24S model boiler. Many thanks