Yep, this is what I thought, just wanted to be sure. I am in Bavaria, so that that its a German market is of course correct. I'm OK with the German manuals, but English is my native language so thanks for the docs too. When I'd opened both valves and let pressure gauge increase to ca:, 1.5, it had dropped back to ca: 1.0 when I closed one valve again. It is now at around 1.2. it got closer to 2.0, but as soon as I closed one again it again drops by around 0.5 bar. Dunno if this is normal. Both valves back in the original position now obviously. I will see if this pressure holds over coming days, and if B7 comes back. Currently, and since around May, the boiler is only feeding the hot water tank, heating it around 3 hours per day. The central heating is (as is usual here) off for the summer. I am more used to the combi / on-demand boiler style which are more common in UK, and usually the filling loop valves are ... closer to the bloiler itself. Thanks a LOT for your help/advice.
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