thanks - it just seems to turn and turn. The boiler seems to want to hold the pressure at 2.5 - it lets it go down, then the noises start again and it holds at 2.5.
Does that sound like the exchanger you mentioned?
Hello,
I know nothing about boilers.
I bled my radiators and the pressure went down to zero. So I filled it up by inserting the key and turning the white cube-shaped nob anti-clockwise.
It filled up to 2 bar and then I closed it. The boiler was making a funny noise and when I took the...