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Bosch 30CDi how do I restore the pressure. ?

I removed a radiator while decorating, and after bleeding the system the pressure from the boiler has dropped to 0. How do I restore the pressure to 1.5 bar. I have been through the boiler paperwork, but can't find any mention of the actual procedure?
George K., December 2011
remove tray under boiler
there should be a filling key on it
under the front righthand side of the boiler you'll find a hole to fit the key
push key in and up and clockwise umtil it locks in
to the left of the key there is a filling tap

b, December 2011
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