The light button works on the w-32 but when I push the fan button the light goes off and the fan no longer works?
Is the issue with the wall control (that has been replaced twice) or is it the fan?

Seeing as how the W-32 wall control is for Casablanca fans, which are very high quality, it is most likely that the remote control has merely gone bad, as opposed to a failure in the fan. I would suggest checking out Casablanca's website for their nearest distributor in your area, get a new W-32 (still widely available), and see if that fixes the problem. Don't forget to match the DIP switch settings from your existing controller to assure proper communication with the fan's receiver.