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Hello Gasguru, thanks for the feedback. Is the diaphragm just a standard part or will it be bespoke to the Saunier Duval make? Do i need to drain the boiler to remove the brass cover and replace the diaphragm? cheers Davie

Hi, i just moved into a house a few weeks ago and the boiler was working fine. I am now failing to get hot water. I have stripped out the domestic hot water microswitch and tested it, it works fine. However it seems to be the piston that drives the switch that is failing to protrude when the...