When you say it has stopped working when you turn the dial do any lights come on?
Do you have a display screen on this if so is anything comming up on there?
Ok im taking it you have checked the fuse and the socket for the dryer?
If so then its more then likely the control board at fault here. What you need to do is remove the top of the dryer and there you will see the power cable going to the mains filter.
Check this and make sure theres no signs of burning on there. If you have a test meter then just check theres 230v there.
If that looks ok then follow the wires to the main control board and again check theres 230v there. If there is and theres nothing comming up still then its going to be faulty control board here.
Ive replaced many control boards on these dryers for this kind of fault.
So try the above and that way you can see were the fault is.
If you need anymore info just get back to me.