have a quick question - what are the causes (possible causes) of a pressure gauge on a sealed primary system (eg combi) falling over time:
so far i can think of: seepage, slowly over time, leak somewhere in the pipework/rad valves/rads/aav, diverter valve, heat ex etc, inside boiler casing/prv dripping/expansion vessel problem/rads being vented ...
are there any else?
so far i can think of: seepage, slowly over time, leak somewhere in the pipework/rad valves/rads/aav, diverter valve, heat ex etc, inside boiler casing/prv dripping/expansion vessel problem/rads being vented ...
are there any else?