Thanks for the replies.
1) If the original problem was the fan motor was stuck on a certain speed, then the problem was a burnt out capacitor
since the cap plays a role in controlling motor speeds. Most capacitors are polarity sensitive while others are not.....ie, it depends upon the capacitor type.
2) When replacing a fan pull chain switch, these must be an identical type of switch as the original version. Pull chain switches come in a variety of internal switching patterns. Even though the exterior of a replacement pull chain switch looks the same as the original, the generic replacement may not work correctly due to different internal switching patterns. Thus the reason an identical replacement type is required.
3) Variable wall mounted rheostat's that are similar to a lighting dimmer switch are never used to control a 3 speed ceiling fan motor. Only a ceiling fan rated 3 speed position wall switch that is "motor rated" should be used. Using a variable rheostat wall switch can also cause fan motor humming noise.
Hope this helps………If you have any additional questions, let me know and I’ll be glad to answer them for you.
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The next time you have an electrical question, you can also request for me at: http://www.justanswer.com/home-improvement/expert-your-electrician ……….Thanks…………..Kevin!