I called then number on the warranty card and was told that it was the R7 receiver and cost 25.00.
It is a small black device under the hood of the fan and just plugs in with the two blue wires.
Has anyone found this piece for less than $25.00. This would be 25% of the total cost of the fan. What's wrong with this picutre? Obviously it appears to be a pretty commond problem.