I installed the boiler about five months ago and all has been working perfectly until last week when some 'old' pipes running up the corner of the chimney-breast started to leak (pin hole leaks). The pipes were about 30 odd years old and I put it down to the fact that previously they were part of the old ch system and they were now being used for the cold water feed and dhw output and therefore couldn't cope with the increased pressure so I changed them - they were only an intermediate part of the feed and dhw and had been used because I didnt want to distrurb bookshelves etc.
As I said, I replaced these sections and refilled the system. The CH is working fine but the diverter valve doesnt operate when I turn on the hot water.
There is also an associated noise (sounds like a restriction or air-lock) when filling the CH and when I open a hw tap.
My first thought was that I had let some solder or foreign body into the mains inlet. So I checked the filter on the inlet tap and the inlet/return manifold but both were clean.
I have subsequently removed and stripped down the diverter valve assembly and the inlet/return manifold. Both were clear - reassembled and filled the system and it is still the same problem. Before I replaced the two old lengths of pipe, there was no noise whatsoever when I filled the system or ran the HW, now there is a noise apparently coming from the i/r manifold area.
My question is, can it be possible that there is an air-lock in the boiler and if so, how do I remove it?
If it isn't an air-lock, what do you think the problem could be?
I have measured the HW flow to be about 5 litres/min.
Any help would be appreciated. Thanks
