In an earlier contribution to this discussion,
Dave Fawthrop wrote:


Now the problem! The system gives a *single* bang a few times a day,
at random. Random events are a pig to fault find. It sounds to me as
if it *could* be water hammer caused by the valve closing. It really
does not sound like a gas explosion, just the pipes reverberating.

What do people think? What is a good method of fault finding?

It shouldn't be too difficult to check that it *is* the valves doing it. Use
the relevant room stats to cause each valve in turn to close and see whether
you then get the noise. You should be able to isolate which valve it is, and
also whether it only happens when the *second* valve closes but not when one
valve remains open.

Even if it is a valve, it's only annoying - not serious. But also see
someone else's post about a by-pass valve.
--
Cheers,
Roger
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