Can you post the model number please.
If you open the main oven door theres usually a rating plate there with the model on it. As the model number usually starts E-nr.
Thanks for that ive got it now.
Looking at this what its going to be is the display strip is faulty. This is a box which as tape going round it with the temperture display on it. What happens is the tape snaps so thats why you cannot see it and only see the lights.
For this you need to replace the display box. Now this isnt a cheap part as you are looking at £80 just for the part itself. And to replace it you need to remove the appliance and take the outer casing off. So it is a bit of a strip down to do this but if you are handy at diy repairs then you should be fine.
The part number for it if you want it is 00151479
Yes thats the part that you turn to use the oven section. Its not the microwave side thats for the oven.
Once you have the oven out and then remove the outer casing you will see it all from the right hand side of the unit.
As this is a microwave you need to make sure its unplugged and locate the high voltage capacitor and you need to discharge this to earth. As they can hold high voltages in there even when unplugged so if doing yourself that has to be discharged before touching.
Use discharge leads if you have one or if not you a screwdriver with a well insulated handle and use that to discharge it.
Then you can see the switching unit there. You will be able to work out how to remove it from there.