In an earlier contribution to this discussion,
Bob wrote:


The upstairs rads have always needed bleeding very regularly, and have
always been quite noisy. It's only recently (12-18mnths) that they
appear to empty with the pump running.

Has the pump ever been removed/replaced? Could it have been put back the
opposite way round from how it was when it worked reasonably well?
--
Cheers,
Set Square
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