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Mend Saunier Duval SD623 Boiler Pressure Diaphragm

saunier duval sd623 no hot water?

after reading couple of forums, changed the diaphragm (lots of holes) in boiler. feel confident changed ok??? microswitches 2,3 still not clicking, no power in actuating switch. I can activate hot water by manually pressing switch 1 and 2. pressure ok heating ok. Any advice. wanna move house don't want expense of new boiler and regs

Paul william
September 2006
Saunier DuvalSaunier Duval SD623Heating, Home Heating SystemsBoiler Pressure Diaphragm
its rubbish brand, you may try any other boiler

kayyens
April 2012
Check plunger under microswitch is moving forward when tap is opened, if not. diaphragm. if yes microswitch. 1.2.3 need to switch for hot water.no1 for heating. If not clicking manualy.microswitch fault

alan
January 2007
I'm looking for a Saunier Duval SD623 's service manual. Have you got in .pdf format ?
Thanks a lot for your time
Regrds
Gianfranco

Gianfranco
December 2006
swap micro switches around poss problem with micro switch no 3.check h/water and c/ heating thermistats.are micro switches in right position

paul
September 2006

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Saunier Duval SD623: No Hot Water - Help!