My fan, different model RV, is fused at the 12V panel. I have a Left/Driver side fuse and a Right/Passenger side fuse. The fan is tied into the Right/Passenger side fuse. Since you said you checked your fuses at the panel I would drop the inner cover and see if a connection on the switch came off. You can check for 12V to verify power to the switch if needed to prove fan has given up the ghost.
__________________
|