My vailant boiler ecotech is flashing f22?

look under the boiler u will see 2 white valves caps turn them both and the boiler should fill up. fill it up to till the dial goes to the middle of the grey.
heres a pic. go down to ecotech filling loop.

http://www.vaillantservice.co.uk/Vaillant_Boiler_Self_Help.html

kash
September 2013