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having spent the evening in a cramped airing cupboard ... hot water supply piping all OK. All hot taps run with no air and no hot water. I seem to have 2 pumps: one for feed to heating coil in cylinder (plus rad in bathroom, plus god knows what else) and one in feed to radiator circuit...

Hi Guys, I replaced my leaking indirect hot water cylinder last week. Cos I'm an amateur it took me a few evenings (with the water off and CH system drained). Now it's all back together, but problem with hot water. The boiler comes on, but goes off after a few minutes. Once its gone off it...