Replacing a Combination Fan and Light Switch (Step-by-Step)

A combination fan and light switch replacement may look simple, but the wiring behind it often tells a different story.

In this video, I show a real-world example of replacing a combination fan and light switch, including how fan/light control wiring is commonly arranged, why wire colors can be misleading, and what it means when there is no neutral at the switch. During the replacement, a common wiring assumption causes the fan and light controls to be reversed, and we troubleshoot and correct the issue the same way it happens in the field.

This video is not a DIY installation guide. It’s an educational walkthrough of how an electrician evaluates, diagnoses, and resolves a fan/light switch wiring issue, using an actual residential circuit.

⚠️ Electrical work can be dangerous if it’s done incorrectly and can result in fire, property damage, serious personal injury, or death, which is why electrical codes, permits, inspections, and safety procedures exist.

This video is intended to explain how things work and why they’re done a certain way—not to suggest that unqualified people should perform electrical work themselves. Any electrical work should only be done within a person’s level of training and experience, using applicable safety procedures, and in compliance with local codes.

DIYers should limit themselves to tasks allowed by local law and within their skill level. Electrical apprentices should only perform work as part of a licensed program and under proper supervision. When in doubt, involving a licensed electrician and the AHJ (Authority Having Jurisdiction, such as the local electrical inspector) is the right path. ⚠️

Timestamps
00:00 - The Problem
02:35 - Circuit Overview
05:51 - Replacing The Switch
12:17 - Power Up (failed)
13:05 - Fixing Mistake
14:01 - Closing Thoughts