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