Vokera boiler problems

[Barr]

Help!
I turned on my heating in sept for a day or so and it worked fine. I then recently turned it back on and now the downstairs hallway and living room rads are not working (stone cold) so I have bled each radiator and now the boiler (which is in the kitchen) cuts out when you turn the heating on. It didn't previously. I have altered the pressure so it is between 1-1.5 (went from low to too my making it too high so bought it back down by bleeding radiator again).
I think I should add that I he had problems with these two rads before and as a result had the system power flushed in June, am now wondering if it was not flushed properly?
Any suggestions comments would be greatly received!

UPDATE: As of this morning neither the heating or the hot water works, the boiler cuts out when you try to put either on (LED light turns red).

 

[DP]

Where did I put that crystal ball. Wish I could find it so that I can SEE what model of Vokera you have.

 

[Barr]

Is Compact 24 an option? If not, where would I find it

 

[bellairaphon]

Do the upstairs rads work at all?

Nath

 

[Barr]

Nath nope. In fact as of the morning the hot water won't work either. The boiler just shuts down (LED light turns red) if you try to turn the heating or water on