I have a hampton bay ceiling fan. I was given to me w/o manual. The light and fan did work with remote at one time. Currently the fan on works when wall switch is turned on. The red light on my remote for the fan doesn't flash when buttons are pressed. I've changed the battery, changed the dipswitch setting to all possible 16 combinations and still no luck. Should I replace the remote and if so where can I purchase the replacement?