hanseatic 65M90D0-E11319G Gebrauchsanleitung Seite 81

Oven window steams
up when it gets hot,
condensation builds up
in the oven.
This is not a cause for concern. It is caused by temperature
differences when heating, baking cakes with a very moist layer (e.g.
fruit) or when roasting larger pieces of meat.
Troubleshooting table Page EN-37