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Many thanks, I attached a hose and drained off a little water to get the black bar reading down to 1. Unfortunetly, probably because of my fiddling with the two red wheels (stopcocks?) under the boiler last week, I think I've really messed things up because as soon as I put the heating back on...

Last week, having bled my radiators, I repressurized my Biasi Prisma Combi Boiler 24SE. At first, not remembering how to do it, I fiddled with the two red valves under the boiler (one on the left and one on the right) and fully opened them. I've just noticed that the bar is reading 2.6...