I have run into a bit of a problem with my 2,5 year old Mini vivaldi, whenever i flush the group the machine will Be very loud every time the heating elements kicks in, And I get a bit of dripping into the driptray as well. But the boiler is quiet as it use to Be, under warm up, after I backflush and after I pull a shot, but not if I flush the group, the noice level rises so it Sounds like a loud boiler/scaled boiler.
I tried descaling it, but the water didn't change color, so the boiler shouldn't be scale to such a degree that this is the cause of the change in sound.
Do any of you know What is causing this, my personal opponion is, that it might Be the 3-way-valve/brew valve that is not closing entirely after flushing the group, but I'm not entirely sure.
This forum contains various threads with photos on how to perform various maintenance and repairs on your S1.
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