2 of my hampton bay ceiling fans stopped turning-one that was installed 6 years ago and one that was installed 2 months ago. I can hear the motor vibrating when it is turned on. Do I need to replace the fans?

Check the manual here
Hampton Bay Ceiling Fan Manuals

More than likely Barry, based on what you described, the wall switch is failing. This is not that uncommon, as it's basically a rheostat. Replacing the switch should solve the problem.

Hope this helped you and thanks for choosing FixYa.

Check this response from 2008 for same model fan.
By resorrowsr on Oct 26, 2008
Fan stopped Turning - Removed fan to check all the connections. All the connections were good. When you turn the fan on, you can hear a humming sound. If you take off the blades you can spin the motor and it will work, but will not turn on it's own.

1. 
   • resorrowsr
   • 2 years ago
   I called Home Depot customer service. I had my receipt, so they gave me store credit for the full purchase. Since I have two fans, they wanted to know if I wanted to replace both fans. I told them one was still working fine, so I only replaced one. My problem was the transformer. You could see where it had overheated and melted.

http://www.homedepot.com/webapp/wcs/stores/servlet/Search?keyword=Hampton+Bay+73554+Antigua+Ceiling+Fan&langId=-1&storeId=10051&catalogId=10053

It could be 1 of 3 things. 1) Receiver unit, 2) Sender (Remote), 3) Motor. For my brand new ceiling fan it turned out it was the motor.

This fan company will warranty to 5 years. Sorry.

if you have connected power directly to the fan motor and it doesn't turn...replace the fan.  However, also check the switches on the fan as you may have bumped them. 

Ordered a part for fan, so stop emailing me!

I would suggest getting an electrician to check the current running through the wiring. I had installed a similar fan in my grandmother's house a couple of years ago and had the same problem. After a couple of months of constantly changing bulbs, I brought in an electrician to check the current and found that there was a short in the wire which kept causing just enough of a current surge to blow the bulbs.

It could be the capaciter, found in the light fixture area.

If there is any guarantee given for them try to exchange the same. If you feel not to return the fan, then go to an expert and get repaired