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How do i fix my boiler (Vaillent)?

I Have just bought a house that was a reposesion the boiler has been off for about a year (Poss more) the boiler powers up but doesn't heat up water or raidiators there is water coming out of the hot water taps but it is as cold as the cold taps the boiler's fault code is f:22 which means there is no water in the system or the pump is broken. the gauge for water pressure is at zero and i have turned all stop cogs i can find in the house I have also shouted at it but this didn't seam to help any ideas?
Robert, November 2009
Me again its ether a Turbomax Plus 824E or 828E

I have tried the taps underneath the bolier but they are all open

If I put a hot tap on, the bolier "crashes" with a F:20 fault which means Over heat cut off activated

any ideas?

Robert, December 2009
need the model to help as each model is slightly different to find filling loop

sean, November 2009
there should be a filling tap under the boiler

b, November 2009