Your power supply line the black wire should be feeding both switches and those switches power the fan black or the light blue.
Ceiling fan with dimmer switch wiring.
To do this method the wire from your wall circuit to your light has to have 3 wires.
If you don t want to pay out for another fan or worse have to repair your home after a damaging fire you re going to want to remove the standard dimmer switch as soon as possible.
If you replace with a blank plate wire nut the black from supply to this black and again cap the red.
How to wire a ceiling fan with a dimmer switch 1.
Connect black fan wire to the black ceiling wire.
Fan speed would need to be controlled by a pull chain.
Turn off the power for the room with the ceiling fan at the breaker box.
This ceiling fan wiring configuration is quite common in bedrooms.
If it s more than just a dimmer you might keep it in a box for if you can use it later.
Switch off the wall switch as well.
A dimmer switch for the lights will be available in several watt sizes.
Eric the concern here is that you will need a speed control switch that will be rated for both ceiling fan motors.
Follow the manufacturer s instructions to hook up your dimmer fan switch at the switch box.
If you replace with a plain switch switch the black wire up to the fan and cap off the red wire on both ends.
Connect the blue wire to the red wire.