I am having similar issue. Its odd because I have the same fan as pictured in front and back vents on my 2015 Thor Axis. On Sat. they both were working and then when tried to turn on Sunday aftn. neither of them worked. I checked all my fuses seem okay, all other lights etc. seem to work fine. I went up and checked back vent and was able to pull out the wire and disconnect the clip. I connected a tester and it did not register any power. Seems something came disconnected or shorted somewhere preventing power from getting to these vent fans. The tiny little fan in my bathroom vent still works, its a different type fan though.
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