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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