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how can i fix vaillant turbomax 828?

how do i fix a f22 fault on a vaillant turbomax 828 have already replaced heat exchanger,pump,diverter valve,and thermistors
brian, January 2010
If there is water in the boiler it might be sales

capitalboilers.co.uk, January 2010
f22 dry fire protection _ No water in appliance, pump cable defective, pump blocked or defective, pump output too low

a, January 2010
link Click here to see other fixes for Vaillant 828.