when the central heating is on the pressure goes 3bar and it vents.
But if I bleed some out of the ragator and drop it to 2bar it stays ther until switched off, when it drops to just above 0bar.
And as I said if then left withno heating on the pressure gradualy increases to about 1bar.
I have suspected the filler loop tapbut what do you think?
stephen
September 2010