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The grey taps are held on by a small screw,first make sure it's fully screwed on and also make sure the that the plastic is not broken,it might be that the taps are showing closed when they're not,hope this makes sense?

You've probably not shut the filling loop tap on the right,I'm assuming your vaillant is an ecotec plus

Sounds like domestic hw diaphragm is worn

Every time you bleed a radiator you are going to have to top the pressure up using the filling loop,should be about 1.5bar when system is cold/not in use (on the red needle)the pressure will rise when the boiler is running but shouldn't go near 3bar.set your thermostat to 60deg for your hot water