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OK, thanks very much for your help Pete. I made sure both the drain cock and the manual air vent was closed, got the system up again with valves open only on two rads and have been bleeding them, getting a good result. What baffles me though, is that when the drain cock and vent were open...

Thanks Pete So are you saying that because they have been open there might have been air going into the system (incorrectly) for ages and that I'm safe to stop this by turning both of these off? I don't know if I successfully uploaded the photo. Did you see the photo? Thanks Chris...

Hi all, I'm new to the forum and to fixing CH problems as well. I've got a couple of questions and was wondering if anyone could shed some light. The set up is a follows: The installation is 30 years old and has a hotchpotch of Stelrad radiators. It's in a flat and is an open vented...

Central Heating Issue