After bleeding a radiator the pressure on my boiler dropped below 1 bar. I have located the two black taps at either end of the filling loop that I need to turn in order to increase the pressure but they won't turn.
I remember the last time a Vaillant service engineer called he said something about needing to do something else first (turn a valve??) otherwise the black taps are impossible to turn. I can't work out what to do and the manual doesn't help. I had a go but accidently turned the pressure release valve and now I have no pressure at all. It's a Saturday and I can't get hold of any plumbers and it's freezing. Can you help?
I remember the last time a Vaillant service engineer called he said something about needing to do something else first (turn a valve??) otherwise the black taps are impossible to turn. I can't work out what to do and the manual doesn't help. I had a go but accidently turned the pressure release valve and now I have no pressure at all. It's a Saturday and I can't get hold of any plumbers and it's freezing. Can you help?