Hello, Sylvia -
Since your Neff oven is new, I hope I am correct in thinking you have the owner's instruction manual for the oven and you already checked there to see if there were any troubleshooting tips regarding the fan still running after turning the over off over an hour prior.
If you do not have the instructions for the new oven, check here:
http://www.neff-home.com/uk/service/manual
Note: You will need to supply the E-Nr number for the oven. If you do not know where to find the E-Nr number, on the web page cited above, click or tap on the link for the rating plate finder.
After checking the owner's instructions for the oven, the next thing I would suggest is contacting Neff Specialist. See the information here:
http://www.neff-home.com/uk/service/support
Talk to a Neff Specialist.
You new Neff oven is most likely still under warranty.
Best wishes.
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