Unusual sound from radiators

UncleZen
UncleZen Posts: 843 Forumite
Part of the Furniture 500 Posts Name Dropper Photogenic
Im curious to know what the sound is from the rads.
When the pump switches off, its as if the rads breath a sigh of releif and contract slighlty, the sound is hard to describe, sounds a bit like metal fatigue. Or handful of sand being sprinkled about.
Its a new boiler and pump etc. The rads never did this with the old pump.

Its NOT one of these sounds;
bubbling, gurgling, hissing, knocking, banging
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