Product review (5 stars): Replace both light and fan switch at the same time.
This is a direct replacement for the lighting and fan switches on the Sub-Zero 650.  I bought two of these just to have a spare for the lighting and discovered that my fan switch was bad also ( hadn't noticed that ).  Do yourself a favor and replace both switches at the same time - it only adds about a minute to the job.  The original switches are not of the best quality ( understatement ).

Be sure to check the light bulbs before replacing the switch - I had four dead bulbs as well as the switches.