Is the fan stuck, try to turn the blades. I had a fan motor fail on my old Holiday Rambler , it started working after I gave it spin and a light hit on the top of the motor. I believe it had a brush the was stuck and the spin and light tap cause it to make contact in the motor again. I didn't own it long after that to figure out if this was the first sign of the motor getting ready to expire.
Mark & Melissa
2015 Redwood RL38 , Kodiak disk brakes , 17.5" tires , 8K Morryde IS