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Where's my hot water?

Ariston Micro Genus combi boiler. Radiators get hot just fine. No hot water, even though the boiler fires up when the tap is turned on. Any ideas?
Peter, May 2008
I found the actuators for the microswitches to be very sticky a touch of wd40 with a cotton bud worked wonders....

Araon, June 2008
sounds like your dhw diaphragm

sonray heating, June 2008
link Click here to see other fixes for Ariston.