....additionally, I have seen the following website, before - dazzlenation....all a bit 'deja vu'.....even though the boiler has never had that type of fault indicated upon the screen, as far as I can remember and so I would not have been likely to have searched for that type of thing, upon google...see previous post....go figure:

https://www.glowcare.co.uk/vaillant-ecotec-f62-fault/

https://www.glowcare.co.uk/tag/vaillant-ecotec-f-62-error-code/