It could well be pipes 'sticking' against a joist. I know that in places there are also 2 pipes which run alongside one another, touching.
It does make a lot of creaking sounds when it hots up (in fact quite a lot of the time).
I think I'll investigate further under the floorboards at the...
Have a pumped system, which generally seems to be working fine.
However, during the night we get several bangs, which seem to come from the system somewhere (but not the boiler area). Sometimes these are very loud. Each time the noise can be best described as a \\\'thump-thump\\\'. Often...
I'm having similar problems. Sometimes several hours after the system has been turned off. The noises are very loud - loud enough to wake us up.
Any help out there?