ok thx Ollski, I'll order a new PRV and clean the guage pipe. The other side of the wall to where my boiler is fitted is the bathroom so there is no pipe outside the house, all i can think is that the relief is going straight back into the drain along with the bath/tap water.
Is it difficult...
I have noticed my pressure gauge reading 0.3 bar so i tried to raise it with the filling loop key, once I inserted and locked it in place i turned the grey pressure nob anti-clockwise and could hear the water rushing around the system but the needle didn't move on the pressure dial so after 10...