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Pressure failing?

It has happened before but I do not remember if I have to open both the two vents under my Valliant boiler or just the one to get the pressure up again. Can anyone help here Thanks

Anita Heiselbaek
June 2009
Heating, Home Heating SystemsPressure Valliant Boiler Help
yes both valve of the filling loop

capitalboilers.co.uk
June 2009

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