OK, thanks for that.
F08 indicates pressure switch stuck on full.
Unplug the appliance from the wall socket.
Take the top off the machine.
Locate the pressure switch, you can identify it by the thin tube attached to it.
Take the tube off, blow down this tube as hard as you can to shift any blockage or restriction in the pressure chamber. Give the pressure switch a couple of good taps with the screwdriver handle.
Refit the tube and try the machine again.
If still doing it, unplug again and follow the tube down.
This end will be attached to the pressure chamber.
Take this chamber off and thoroughly clean it out, clean out the port into the tub too.
Reassemble and try again.
If after this it's still faulty you'll need to start replacing parts.
I'd suggest trying a new pressure switch first.
Failing this, if all of the above fails to resolve the problem you're possibly looking at a faulty main control board.
Try the cleaning / clearing first. Let me know how you get on.
Good luck with the repair.