Have same issue in bedroom.
I have the same clicking noise in my bedroom fan. I have taken it apart several times and believe that the problem is that the rotating hub is contacting screw heads or (head) because of the small clearance between the hub and mounting. I tried using a fine machine washer to open up the space, but if I remember, the amount of threads on the castle nut would not allow the fix.
All I can say is, take a look at the upper side of the fan blade hub for scratches, or while I am thinking about it, you might try doing something like your dentist does when he is try to find a high spot when you bite down.
Spray some flat black paint into the upper side of the hub and run the fan and look for some hits or scratches.
If someone concures with the problem we can start looking for the solution.
sweet dreams, RAB
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Bob and Bev
06 Itasca 40' Horizon KD
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