Have a leak from the bottom of our boiler which I've traced to a pipe running under the pump. It's a 15mm pipe which runs internally from the CH return and twists up behind the expansion vessel flexible pipe. It joins on to a black plastic junction which then becomes the CH flow, or diverts upwards (to be heated again I suppose). The pipe is leaking where it runs underneath the pump and joins a small , black plastic bit. Anyone know what part I'm talking about? And if so can I tighten it or do I need to get a plumber? The manual illustrates everything around it but not this piece so sorry I can't tell you what the pipe is called.[/i]
