Ariston Boiler Issues

[chriskarl22]

Hi, I am currently having issues with an Ariston Combi A series boiler giving an E08 - "No water in primary circuit" error code, the circuit is holding water pressure fine, the pump runs and seems to have a bit of force behind it and I have replaced the pressure sensor but the problem persists.
There is no mention of a flow meter or any other sensor which could monitor for water presence in the manual or spares list so I assume it must be done from the pressure sensor. Any help wpuld be greatly appreciated.
Kind Regards
Chris