Rattling Boiler
RJH brought next idea :
Couldn't see anything obvious. Some wire looms loose. But it'd take a lot to
create that sound. Another step is as you suggest - fire up without the cover
on - building up to that :-)
You will be OK with just the outer cosmetic, none sealed panels off.
Under that is a second room sealed panelling system, with out which it
should never be run.
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