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Hi, Pressure was set to 1bar and remained at 1 bar for a couple of days when it was off or on -now its dropped to zero when off then rises to just under 2 when switched on you can hear water running through the system and radiators seem fine?

Hi hope someone can advice? My girlfriends central heating system _ she was topping up the pressure each day so I thought I'd repressurise the expansion vessell which I thought I did -everything seemed fine pressure was constant for couple of days she switches her central heating off each...