Do you have to drain down the heating system before checking and pumping up the expansion vessel? Mine was 0.5 bar when I checked it which is manufacturer recommendation, so I did not have to do anything just pumped it a tiny bit, to compensate for the loss when I disconnected. I checked mine when the system was cold and not drained down, good enough?
On a combi what is an acceptable upper pressure reading when the heating is on? Mine goes from 0.6 stone cold (manufacturer recommends 0.7) to 1.3 when heating is on.
On a combi what is an acceptable upper pressure reading when the heating is on? Mine goes from 0.6 stone cold (manufacturer recommends 0.7) to 1.3 when heating is on.