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the pressure was low this morning, but now seems to be ok, maybe cos i have turned the heating on? my bottom left hand button has a minus sign, and is linked to a plus sign- is that it? i pressed it but nothing happened on the display. the pressure gauge is still just below one, shall i...

hello, can anyone help me with the vailant 828 please? my pressure has gradually dropped to below 1 and i would like to top it up as i had absolutely no water at all this morning (it has returned now without much pressure) i have struggled with the 2 black levers underneath, and i think...