The ceiling fan w/light are controlled by a remote control device. A wall switch which over-rides the remote, i.e., if the wall switch is turned off, the fan and the light would turn off. And, the switch must be turned on for the fan and/or light to respond to the remote.
Suddenly the fan is stuck in low speed, and the light won't turn on. The remote control has power and just to be sure the 9v battery was replaced with a fresh one. The remote has four toggle switches which have not been altered. The receiver is housed at the top of the ceiling fan close to the ceiling. It is about 14 feet from the floor. The receiver dip switches have not been altered either.
What could be done to re-connect the ceiling fan/light and the remote controller
1) Tested the remote control by setting the dip switches to match a remote for an identical and properly functioning ceiling fan in another room. That fan did not respond to the remote.
2) Set the dip switches of the other remote to match the failed remote. The failed fan did not respond to that remote either.