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- 3 May 2010
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Can anyone help. I have a vaillant boiler that comes with a Vaillant key apparently for opening the valve to fill the system using the internal filling loop. I read on a DIYNOT forum that i just had to open this one valve and that would be it.
I did this and heard the sound of water flowing - so far so good. But the pressure gauge needle didn't move. It eventually moved a fraction but only after at least a minute of the valve being open (the full quarter turn).
I've just had another go and this time when i open the valve there is no sound of water flowing.
What am i doing wrong?
I did this and heard the sound of water flowing - so far so good. But the pressure gauge needle didn't move. It eventually moved a fraction but only after at least a minute of the valve being open (the full quarter turn).
I've just had another go and this time when i open the valve there is no sound of water flowing.
What am i doing wrong?