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Hot water didn't come out when in fill mode as you suggested ironman - so lever function seems to be OK.

Wow you guys are quick and admittedly know your stuff. Ever thought of writing manuals for Vaillant? Unfortunately after following your advice (which was sort of what I was doing before), it looks like there is an actual fault somewhere in the pipe or the flow, as sadly, the much hoped for...

Hi I have searched through the forum and have read all the advice. I get the F.22 message and the pressure is 0.6 and below. I have the silver braided hose type of boiler and while I see the advice on turning the valves, when I do this I get no rush of water and the pressure needle remains...