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Vaillant-low pressure?

I have recently moved into a house with a vailllant combi boiler. I cannot find the manual for it. Or which model it is. All it says on the boiler is vaillant.
The gauge shows a low pressure and there are several pipes leading into it, but with no tap, just screws. How do I increase the pressure? Also where can I download a manual for future troubleshooting?

Riz
January 2009

Vaillant Heating, Home Heating Systems House Boiler Find

we had the same problem when we moved in to our house, vaillant have a website, from there you can download the manual, to increase the pressure (if its like our bolier) there will be 2 plastic levers hidden under the boiler, open both of these to increase the pressure,

dave
January 2009

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Vaillant Boiler Low Pressure - Fix & Manual