We have a 2013 vintage house, I have installed the light kit on all four fans. In every case, I found the contractor had installed the RED wire from the wall switch to the fan. At the fan half of them had the BLUE light wire connected to the RED wire (at the ceiling) the other 2 had the BLUE wire connected to the BLACK (hot) wire (at the ceiling), on these I had to TURN OF THE POWER, and move the BLUE wire to the RED wire.
For ALL of the fans, I removed the single position switch, and installed a duplex switch, one for the light and on for the fan. The existing BLACK wire went to one of the switches, the RED wire went to the other switch, and the BLACK (HOT) supply wire went to both switches.
Found the same conditions at a neighbors house when he went to make the same changes.
If you are at all concerned about the above wiring, contact a licensed electrician to complete the work.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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