I was having the same issue. I noticed that when the main fan unit was removed, there was a small plastic piece that was sticking up from the base next to the filter, which has a female end on the fan unit. I played with this, and realized I could lift it up. Once I did this, I replaced the fan unit and it started working. I think this is the water level reader which, when all the way down, won't allow the fan to start since it thinks there is no water.
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