I am looking for information about electronic circuits for laundry machines, build-in ovens, and dishwashers: books names, web sites or anything that can help me learn how to fix circuits
In addition, I would like to get information how I can buy genuine electronic circuits straight from the manufacturer.
But generally these days manufacturers will not supply you with service information or spares, they will only do this to their approved service agents - and not even to long established service departments if they are not approved.
There are some exceptions, but most of the major manufacturers now operate this policy - certainly in the EU.