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Unfortunately I have not found a solution yet.

I am not sure if it is to do filling loop, the boiler was working fine, i used it for a lot during the cold period and suddenly it devolved this problem. No the pressure does not go down when it is turned off, it only goes down when I blead the radiator and the water that comes out has a lot of...

Yes, it is turned off, I still have the problem.

Hi, the pressure of my Vailiant 831 combi boiler keeps rising when I turn it on. I am having to blead the radiator after every 2-3 hours of boiler being on to reduce the boiler pressure or the pressure bar goes to red. It seems like air builds up in the system when I blead the radiator the water...