My Vokera combi boiler when turned on starts to push water out of its over flow (outside) and when it stops it needs the pressure topping up.I have checked all the radiators and there are no leaks. This has only started within the last couple of weeks. It works fine apart from that but surely this cant be right.
i have same problem bad news plumber check boiler heat exghangher knackerd
j bain, March 2007
wrong mister hi-spec! expansion vessel again!
ben, February 2007
thats your prv (pressure relief valve) look under boiler you can see it red knurled knob open and close a few times grit gets stuck in them. if this fails you'll need a new one seals are faulty.
