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how can i put pressure back in my vaillant ecomax 835e?

can u plz tell me where the pressure knob is to put water bk in the bolier
sarah, October 2011
Underneath the boiler (right hand side) there are two black knobs, both move 1/4 turn. The knob closet to the front pushes away, the knob towards the back (attached to the PRV) pull towards you. Open them both, carefully watch the pressure on the dial until it reaches 1-1.5 bar (green area on the dial), then turn them both back off.

Carefree, October 2011
link Click here to see other fixes for Vaillant.