Re: AEG B2190 oven
on these models there is device that cuts in the cooling fan. When this stops working the safety thermostat cuts all power off, it is sensing the overheating that you mention.
The repair requires stripping down of the oven and replacing a device which has four terminals connected accross selector switches. generally not job for a diyer. I would suggest looking on the site for a local AEG repairer who should be able to sort it for you.
hope this helps.