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Ok problem identified and solved to a satisfactory level. The 'gizmo' I last mentioned is the pump pressure switch. It had nothing to do with the problem. There was also nothing wrong with the other diaphragm assembly either. I found it clear and virtually spotless, including the thin...

Ok i've looked into it a little more. From cold, opening a hot tap causes the CH pump to come on but not the fan. This occurs as the 3 switches atop the diverter valve are closed. I say from cold, because the last time i tried after the CH had been on and gone off, ie the boiler was still hot...

Thanks to both of you guys. It's fixed - for now... Agile you right about people's sentiments about the boiler! Although funnily enough I almost changed one guys opinion, when I told him the boiler was installed in '97 - he could believe it could still be running! DP I also share...

Hi there, My sx20 mmfi ce has had the above problem for a while. When a hot tap is operated the switches are activated, but the boiler does not respond. Also, when using the shower, i have to run the basin tap to keep hot water flowing! I have changed the diverter valve diaphragm 2 years...

If anyone still has one of these dinosaurs, as i have then you may still be fighting the same problem. Its well worth the od £5 to replace the diaphragm, if you can stand the rather awkward valve removal. I have done it twice now, 1st to replace the diaphragm, 2nd to get to the heat exchanger...