Exprelia E05 - Water Circuit Priming

The last I did before this error was a carafe cleaning. I have tried to fill the water container with descaling solution and restarted the machine 20 times. This has gotten me out of the problem once, but a month later the same problem reappear with no luck getting it back working. Much later - I gave it a new try and fixed it - see the last comment! It happened again so this time I wrote a guide on ifixit.com - https://www.ifixit.com/Guide/How+to+Descale+Boiler+-+E05/125572