Water wheels do not turn

Unplug the unit from the A/C outlet.  Turn the fan unit over, and with your finger, spin the fan as fast as you easily can.  Tooth like projections should rotate out of the lower most part of the assembly.  These teeth drive the wheel.  If they don't come out, the problem might be in the seating of that silicon rubber nipple, or the "tooth" assembly could be gummed up with algae and deposits.  You can wash it out.  The problem with mine is the teeth work, but the wheel still doesn't move.  I have emailed the sales office for help.  I love the unit's performance, but it is temperamental.  Good luck, and please post, if you fix it.  

I agree sounds like you need a simple gear box. try the online help support at www.ventahumidifiers.com