F06 is a programe selector switch problem.
Try pulling the plug out the washer and leave it for 15 minutes. Hopefully this may reset the electronics in there.
If it doesnt then its either the front control board or the main control board at the back which is the problem here.
But drain the water out from the filter at the bottom and pull the plug out and this should allow the door to open after a few minutes.
Let me know if the door opens.
The filters at the bottom of the washer behind the plastic cover on the right.
With you saying emptying the pipe at bottom of the machine thast what i thought you ment.
Drain the water out from there. You will need a few towels and a bowl to do this.