We have four Harbor Breeze ceiling fans model # 192909. Three of them work fine. One works with the remote to turn the fan on low, med, hi. The remote does not turn on the light or dim the light. We checked the hand-held remote against the other three units we have and it works fine. It seems the remote unit inside the fan assembly is not working. Any suggestions or can we purchase a new remote for the inside of the ceiling unit?