How can I tell if the problem is the fuse?

Use a multimeter and test it for continuity:

Vornado Duo Fuse Replacement

@djlaine17 you can't, until you test it with a multimeter. If you have not done this before, check something like [https://www.youtube.com/watch?v=Kxl-IjEl... |this video for the How-To.

This "micro second it moves an inch" leads me to believe that it is not your fuse. When the fuse is "blown" there is not power going through the circuit. None. That means you would not get ANY movement. The issue you are describing sounds like either a capacitor issue or a motor driver issue. Once you checked the fuse to verify, check the circuit board Vornado Duo Circuit Board Replacement for any obviously damaged looking component or burned traces etc. Post some pictures of what you find/see with your question. That way we can see what you see. Also, make sure that tell us the exact make and model of your fan

Adding images to an existing question