We have a Hampton Bay Vallejo Model No. 181-425 ceiling fan purchased and installed in June 2005. Unit has been run most days for several hours at Low and Med speeds and in both directions (dependant upon the season). Two days ago it had been running on Low speed counterclockwise overnight, and when I hit the REV button on the remote control a distinct dull pop sound came from the fan unit and it stopped running. The lights still work, but the fan doesn't respond to any inputs from the remote control.