Vokera Mynute 16e boiler - high pressure and leaking

[milosz]

I wonder if you could help me -I have a problem with my Vokera Mynute 16e boiler

I just moved in, when I moved in we had hot water.
and after 3 days we suddenly are left with cold water only

immersion heating of water tank stopped working (checked fuses - not this)
so I switched on the boiler

problem is that instead of heating water it heated radiators first - and it was quite sunny - we didn't need that

on top of that when I switched it on it started leaking when working (from first pipes on the left - looking on it or "right side of the boiler")

also pressure seems to be very high - 2,7 - 2,8
I read in manual it should be only between 1 - 1,5

and now it's very close to red 3

how can I seal he boiler, make the pressure go down?

I open one butterfly yellow valve at the bottom for a while - but I couldn't see any effect (opened while boiler was not working , I was too afraid to open it when it was working)

PS - the pressure on the gauge stays high 2.7-2.8 even when boiler is not working

would you be able to tell me what to do?

is there any chance that my stoppage of my immersion heating was connected to boiler failure?

thanks for your comments
Milo