We were a Fleetwood dealer. On most fan problems it was the circuit breaker. The second was water leaking into the fan and seizing the motor. It would be unusual for both to seize. I would take a small screwdriver and flip the fan blades to see if they spin easily. Last would be to remove the three screws and check for voltage on the wires. Make sure you have a good ground. If the ground has come loose that could be your problem.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.