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If it’s plumbed wrong then yes but if it’s worked fine up till now then Doubtful. The pipes out of the front of the cylinder are flow and return from the boilerYes, but there are two pipes coming out of the front of the cylinder that go to the tank in the loft. One is a feed and one is a expansion pipe(?) from the cylinder isn't it? Could it be sucking in air from the expansion pipe(?).
Thanks.