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How do i increase the water pressure on a vallient Eco Tech plus?

I have a Vallient Eco Tech Plus. The water pressure droped on it to 0. How do i increase it, i was told by the man who came out to fix it that i have two grey taps underneath my boiler. Does he mean under the base of the boiler. I could see two grey knobs..
Nicky, November 2011
Two gray nob turn both make it straight one by one to fill once fill to 1.5 make horizontal

lal, November 2011
link Click here to see other fixes for Vaillant Eco Tech Plus.