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Ok, so before i checked the plate heat exchanger, i wanted to give the filling loop one final test and leave it off for a long time, as the pressure does seem to be increasing slowly. After giving it 24 hours, and making sure the boiler kicked in, was off for a while, and the pressure went...

So, just to check, drop the pressure right down or back to 1 bar or so? do i have to turn off the cold water at the mains or the cold water in supply on the boiler? and also, when turning back on, i just leave the boiler off right? Pressure is slow to rise so i'll have to leave it off a...

Hoping someone can help! I have the Glowworm compact 80e boiler and the pressure keeps rising to 3 bar and then the relief valve kicks in, here is what we have tested to rule out so far. The filling supply/loop is ok, have taken and left this off to check there is no small leak letting...