As part of our house renovation last winter, the builder's plumber fitted a Viessman conventional boiler with an Ariston unvented cylinder. Next to the cylinder there is a motorised valve with three pipes attached which I think sets the combination of HW/CH, and on a separate pipe there is another motorised valve which only has two pipes so presumably on/off.
All was fine in the spring when we had HW and CH on at the same times, just some background noise of water going through pipes - however now when the HW only is on there is (some of the time) a rising and falling sound a bit like a jet engine revving up and down while taxiing (it's not actually that loud, just enough to be really irritating). When we turn on the heating this noise stops immediately and vice versa.
We've got the builder coming back in a week or so to look at it - I can gurantee 100% that he will say that it's normal noise - but it's much louder than anything in previous houses we've lived in.
Can anyone suggest any diagnosis I can do before he arrives which will give us a clue as to what the problem is? The whole system including piping is totally new.
Any help very much appreciated.
Geoff
All was fine in the spring when we had HW and CH on at the same times, just some background noise of water going through pipes - however now when the HW only is on there is (some of the time) a rising and falling sound a bit like a jet engine revving up and down while taxiing (it's not actually that loud, just enough to be really irritating). When we turn on the heating this noise stops immediately and vice versa.
We've got the builder coming back in a week or so to look at it - I can gurantee 100% that he will say that it's normal noise - but it's much louder than anything in previous houses we've lived in.
Can anyone suggest any diagnosis I can do before he arrives which will give us a clue as to what the problem is? The whole system including piping is totally new.
Any help very much appreciated.
Geoff