My issues were that it 1st - only ran on one speed, then 2nd, wouldn't turn on at all. The problem (I think) ended up being two loose bolts in the back housing behind the switch controller. When I took off the back cover, they just fell out. I couldn't find any photos of what the assembly should have looked like, so it was trial and error testing. Once I put the loose bolts back on the “hidden” posts/screws on the far back metal plate and tightened them down (and undid all the other adjustments I tried to make first) it worked like a champ.