The S.D. boiler in my new flat won't operate because the pressure is way too high. I have tried bleeding a radiator and using the relief valve which will lower the pressure while the mains supply is shut off, but as soon as I turn the mains back on up goes the pressure again. I've tried turning the mains on just a little bit but that doesn't work.
is the filling loop letting by,make sure both valves are shut under boiler, your boiler has a built in filling loop.
if that fails the dhw heat exchanger is letting by to the primary circult.
hi-spec plumbing
August 2007
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.