Select the issue you are having with your fan:
The lights and the fan don’t work
This indicates that there could be a problem with the wiring or switch going to the fan.
The lights work, but the fan doesn’t
Unless there are different switches for the fan and lights, this indicates the problem is probably within the fan itself and could be mechanical.
Just the lights don’t work (one or more of them)
Again, this indicates an electrical problem most likely exists within the fan housing.