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Well I have another Vaillant boiler for another floor and the analog gauge is stuck shows zero too, and that boiler works fine.

The one with dials. I think the analog pressure gauge is broken, it's stuck at zero while the display shoes something else (but that shouldn't effect anything). Apart from that everything else looks fine.

I went on holiday for a ~9 weeks and turned the boiler off. Now I returned, turned it back on, but no hot water. Been doing this for the past few years, and everything was fine. There are no error codes. Every time I turn on the hot water tap, I hear the boiler also turning on, and the...