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@The831Bunny Well that worked, the pressure went up. But now the side of the boiler is leaking from somewhere internal... I guess that means I cooked it. doesn't it?

Hi, I am getting the F22 message on my Vaillant hr Solide boiler (VHR Netherlands version). The bar reading is low too at 0.5bar. So I would like to top it up. In the attached image, you can see there are two valves, black on the right attached to the yellow pipe (nothing attached on the...