Hi,

I have a non-condensing combi (Ariston Microgenus) from which there is
a slow but constant drip from the 15mm pipe sticking through the wall
to the outside (which I think is for emergency pressure relief?). The
pressure gauge on the boiler is at 2 bar, which is within its
tolerance range. So why is it dripping and what should I do to stop
it?

Cheers!

Martin