I had my brand new Verona dual fuel installed today and ran it a full two hours as the manual suggested to clear any odors from the manufacturing process. After turning the oven off, the fan continues to run. It's been quite awhile, and it seems there's nothing I can do to shut it off. It's absolutely deafening. I am upstairs right now and can still hear the buzzing from here. I am really disappointed. Is there a way I can reduce the noise? Perhaps some screws or nuts need to be tightened after install???

Cooktops - Verona