It is a hot wire that comes from the ceiling and hooked up to a wall switch.
Harbor breeze ceiling fan installation red wire.
If black works decently then try to connect black to red.
After doing that connect the green to green and white to white.
You can cop both leads with wire nuts if not using these ends.
Connect the black wire on the fan to the red wire from the ceiling.
This diagram should be used as a guide if you can follow this guide at your risk.
If the fan has two switches connect the black wire from the fan to the black blue and red wire in the ceiling.
Twist all the white wires in the box together and cap them.
The wires running from the box in the ceiling need to be matched up with the two green wires and ground wires coming from the fan need to be spliced to the bare ground wire.
The red color on fans is for powering the lights.
Blue wires are to support future addition of a light.
You may come across a red wire when wiring a ceiling fan with 4 wires.
When included in your device it works as a conductor to transmit power to the lighting kit.
Connect the red wire from the fan to the other terminal on the fan switch and the black wire to the light switch.
Disclaimer for harbor breeze ceiling fan wiring diagram.
Make a pigtail of the ground wire using two 6 inch lengths of bare wire and connect one ground wire to the fan switch and one to the light switch.
If there is a metal box in the ceiling then you need to connect the ground wire to that also.
Feed the black white red and copper.
Make sure grounds are used.
Here is his answer.
If you do not wish to have a light kit on the ceiling fan but do wish to turn it off and on with the wall switch connect the black wire from the fan to the red wire in the ceiling box.
Install the ceiling fan mounting plate to the electrical box in the ceiling using the two mounting screws supplied in the ceiling fan kit and a screwdriver.
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Put a wire nut on the exposed portion of the black wire in the ceiling box.
If someone is installing harbor breeze fan switch wiring after watching this kindly install it at your own risk.
Connect it to the black wire which is hanging down from the ceiling.