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Have an eco plus 624 boiler showing fault 22?

How can I fix it, it is showing low pressure 0.2
Sul, December 2016
You COULD have done a Google search for yourself.

I found these:

http://fixed4free.com/answers.php?id=373460

http://www.boilerfaultfinding.com/vaillant/f22/

https://www.vaillant.co.uk/downloads/ecotec-plus-user-manual-261421.pdf

XXX, December 2016