We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
If you suspect your Kinect is broken, ring MS Xbox support and they will help you diagnose/troubleshoot or arrange a replacement to solve this for you.
Presumably the fan only ever comes on when necessary as I've never even noticed mine has one but mine is very well ventilated. I'm 99% sure there is no fault here and if there is, we're in the same situation haha.