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How to refill Vaillant ecoTEC pro system?

I have a Vaillant ecoTEC pro combi bolier. Following workmen removing a radiator I have an F22 code error. How do I refill the system?
Sonarman, May 2013
with filling loop right under the boiler you will see silver faxi pipe ,filling valve open still 1.2 bar,or if kitchen unit fitted it may be inside

ltd, May 2013
link Click here to see other fixes for Vaillant.