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PF id=30 just means that the control board is re-booting and it's programmed for a 30 inch oven. You should be able to press any button to clear the display but if that doesn't work, your interface control board has failed and would need to be replaced unfortunately.
You'll need a new control board unfortunately it has just failed. As for the microwave being dark, hopefully the control board is the cause for this problem as well, but you could have a completely different issue with a bad fuse but there are about 3 or 4 fuses on this unit so you'll need a technician to take the unit apart and test the different fuses and take the unit apart.
No problem and good luck
Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?