I have ave a vaillant boiler and just now i used the kitchen tap water and there is not hot water. And, the boiler is flashing F.22 and i don't know what this means! and the pressure has dropped to 0.2 and i have read the installation booklet, but it doesn't help me. How to i fix this problem?? thanks

Bal, April 2017

Youtube
Vaillant
F22 fault
Topping up pressure

Asbestos, May 2017

Just do a Google search for "vaillant ecoTEC plus f22", for goodness' sake!

It IS mentioned in the manual - you will find a link in the results to your search. Page 13, I think

acp, April 2017