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Thanks! I did a further search, and it all became clear. My key had obviously fallen out, and I had to valves which could be turned using a screwdriver. Opened one valve and then the other and waited for the right pressure, then turned them both off again. Thanks a million!

I have moved into a house with a vaillant turbomax plus 824. The pressure when cold is very low (0.2). I have looked at the manuals, and it says the boiler needs refilling. However, the diagram in the installation manual on how to fill up the system looks nothing like mine! Is there...