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Thanks, everyone.

Any ideas how this can be investigated and how the pipe could be unblocked? Would this be fairly routine for a professional?

Yes, it only occurs when the system is switched on.

At the moment I only have my hot water on in an open vented system. When the hot water comes on hot water flows continuously into the expansion tank via the bent pipe that overhangs it. I had a plumber in and he turned down the setting on the pump. That seemed to cure the problem, but now it has...