How do you install a 3 way smart dimmer switch?

Install a 3-way smart dimmer switch by turning off the breaker box. Remove both switch plates carefully. Find the shared wire. Connect the new smart dimmer switch’s cords per the manufacturer’s instructions. Wall-mount the new switch plate. Test the smart dimmer switch after installation. Consult an electrician.

Smart switches simplify your life and expand your options. Saving energy and eliminating the worry of leaving a light on when you go for the night or the weekend are benefits of using your phone to control your lights. Installing a smart three-way switch is distinct from a traditional three-way button. Following these instructions will teach you how to install a smart switch using the existing wiring.

In a time when innovation and ease go hand in hand, the idea of home automation continues to change how we interact with our living spaces. One crucial thing stands out as we move towards smarter, more energy-efficient houses: lighting. Traditional on/off switches are now a thing of the past. With the rise of smart technology, a new era of lighting control has begun that combines style, usefulness, and energy efficiency.

In this detailed guide, we explain step-by-step how to install a 3-way smart dimmer switch, making the technical parts easier to understand and giving you the tools to start a DIY project that blends technology and design. Join us if you’re a big fan of technology or a homeowner who wants to learn about the future of lighting. We’ll show you the way to a smarter, more beautiful, and more energy-efficient home lighting system.

Tools Required

You’ll need electrical and handicraft tools to install a 3-way smart dimmer switch safely and efficiently. Before starting this project, ensure you have these tools:

  • Voltage Tester: A non-contact voltage tester is needed to verify that the circuit you’re working on has no electrical current. This protects you before wiring.
  • Screwdrivers: Flat-head and Phillips-head screwdrivers must remove, and attach screws on your switch plate and new dimmer switch.
  • Wire Strippers: These instruments accurately remove electrical wire insulation for suitable connections.
  • Wire nuts connect and insulate wires: They ensure secure connectivity.
  • Needle-nose Pliers: These bend, twist, and grab wires, making installation easier.
  • Circuit Tester: A circuit tester verifies that the circuit’s electricity is off, adding safety.
  • Utility Knife: Cuts and trim wires and cables cleanly.
  • Electrical tape: insulates wire connections and prevents accidental contact.
  • Labeling wires: can help you track connections, especially in complex setups with many cables.
  • Pencil and Notepad: Sketch the wiring layout or take notes during installation with a pencil and notepad.
  • Step Ladder: A step ladder may be needed to reach the switch box, depending on its location safely.
  • Safety gear: Protect yourself with safety glasses and clothes.

Remember to be careful and know what you do when working with power. If you need clarification on any part of the construction process, it’s best to talk to an electrician or other professional before moving forward. Your 3-way smart dimmer switch can be safely installed if you have the right tools and know how to install it.


In a lighting system with three separate switches, installing a 3-way smart dimmer switch requires replacing one of the pre-existing switches. To ensure that your installation goes off without a hitch, carefully follow these steps:

Step 1: Make Sure the Power Is Off

Find the circuit that controls the three-way switch in your service panel and turn off the breaker that controls it.

Checking both switches with the voltage detector will allow you to establish whether or not you have located the appropriate breaker.

Step 2: Determine Which Wires Are Black Terminals

After removing both switches from their respective boxes, you will notice that there are a total of four wire terminals.

Find the terminal on the switch labeled “common” with a black screw attached to it.

Put a piece of electrical tape over the end of the wire connected to the screw on each switch.

Step 3: Determine Which Wires Are Travelers

On each of the switches now in use, you will find two travelers linked to terminals opposite one another. These terminals typically have a color similar to brass, and the wires connected to them are usually black and red. However, this is only sometimes the case.

These wires should be identified as Traveler 1 and Traveler 2, respectively.

Use a Sharpie to make a distinct mark on one of them so that you can quickly tell them apart.

Step 4: Disconnect the Wires and Prepare Them

Take off all of the cables that are attached to your present switches.

The Leviton Smart switches require a straight wire cut back to a length of 5/8 in.

Re-route any wires that have been tangled and check to see that they have been stripped appropriately.

Tip: If you have more than three inches of wire protruding from your box, snip off any hooked wires and re-strip them to create a straight and clean wire end. This is only necessary if you have more than three inches of wire protruding from your box.

Step 5: Locate the line feed

After ensuring that the prepared wire ends are not contacting one another, turn on the breaker allocated for this purpose.

Cautiously utilize your voltage detector on each wire tagged with tape to determine which one is hot. This live wire serves as your line feed; at this point in the circuit is where you should install your primary smart switch.

Your load connection, which leads to the light fixture or outlet, is in the other box with the taped wire. This box is not considered to be hot.

Take note: This is where you should install the remote smart switch.

After you have located the line feed, the breaker should be turned off.

Step 6: Install the Primary Intelligent Switch

Look in the box containing the line feed for any white neutral wires spliced together now that the breaker has been switched off once more.

You will need to remove the wire connector before you can install the white jumper wire that is five inches long that came with your new smart switch.

After splicing together the three neutral wires, connect the other end of the jumper wire to the WH terminal on the switch. The BK terminal is where the line feed wire that is marked with tape is attached.

The YL/RD terminals and the RD terminals are the destinations for the two traveler wires.

Make a mental note of which traveler wire is connected to each of these terminals (for example, Traveller 1 is connected to YL/RD, and Traveller 2 is connected to RD, or vice versa).

When you are wiring the remote switch, you will need to know this information.

To finish the wiring of the main switch, connect the ground wire to the terminal that is colored green.

Step 7: Installing the Remote Switch

Again, hook a jumper wire from the white cables spliced to the WH terminal on the remote switch. Do this in the box that contains your load connection.

Note that the traveler previously connected to the YL/RD terminal on the main switch will now be connected to the YL/RD terminal identically positioned on the remote button.

The traveler attached to the RD terminal on the main switch is then spliced together with the load wire marked with tape in this box. The final step is to turn the power back on.

On this remote switch, the BK and RD terminals that are still present are not connected to anything; they are there to accommodate a variety of uses for the control.

At long last, connect the ground wire to the terminal that is green in color.

Step 8: Tape Terminals

Wrapping your rewired switch with electrical tape will prevent any arcing from occurring between the bare terminals and the ground cables or metal boxes.

When reinstalling the switch, be sure to tuck the wires within the box carefully.

Step 9: Confirm That the Manual Operation Is Working

After manually operating the switches after you check your installation, you should turn the power back on.

Before connecting to WiFi and utilizing the Phone app, it is in your best interest to confirm that regular operation has been resumed.

10th Step: Connect to a WiFi Network

Download the app after first connecting your mobile device, be it a phone or a tablet, to the same WiFi network that your smart switch will be running on.

To set up the whole wireless operation of your three-way switch, you must follow the directions provided within the app.

A helpful hint is that most smart switches enable you to connect to smart speakers such as Alexa or Google Assistant, which allows you to derive even more value from a three-way smart control you’ve already placed.

How to Fix the Problem with the Flickering

 How do you install a 3 way smart dimmer switch?

If the light is flickering, you should check if any bulbs have come loose and ensure that each can be turned down to a lower level. If the flickering does not stop, the issue may be due to surges or spikes in the electrical supply where you are located. By manually adjusting the lowest dimming point to the lowest dimming point, this issue will be resolved. 

To manually adjust the brightness level to the lowest possible setting, press and hold the dim up and dim down buttons simultaneously for at least 5 seconds. This will bring about the desired effect. Once the power has been restored, the switch’s power indication circle will begin flashing. 

You can select the lowest dimming level possible without seeing any flickering by using the buttons on the dimming control panel. The next step is to push and keep holding the dimming buttons for either five seconds to complete the setting or until the power indicator light changes from a circle to a solid light.

How to Install the Kasa KS230 3-Way Smart Dimmer Switch

*Note: Working with home electricity is potentially dangerous. If uncomfortable with electrical wiring, consult a licensed electrician for installation assistance.

Preparing for Installation: Tools Needed:

  • Non-Contact Voltage Tester
  • Insulated Philips and Flathead Screwdrivers
  • Wire Nuts (3 provided, may need more)

Shutting off the Breaker:

  1. Locate and switch off the relevant circuit breaker.
  2. Test the switch to ensure power is off before proceeding.


Step 1: Remove faceplates from existing switches using a screwdriver.

Step 2: Unscrew existing switches from the wall. Take a picture of the wiring for reference.

Step 3: Take a picture of the existing switch wiring.

Step 4: Test each wire for voltage using the Non-Contact voltage tester.

Step 5: Identify the wires, ensuring a Neutral wire is present for KS230 installation.

Step 6: Remove existing switches, place wire nuts on exposed wires for safety.

Step 7: Turn the relevant circuit breaker back on.

Step 8: Test wires for power to identify the Line wire. Label it.

Step 9: Turn off power again.

Step 10: Test and label the Line wire.

Step 11: Label the Neutral wire.

Step 12: Label the traveler wires in both switch boxes, ensuring consistency.

Step 13: Label the Load wire. Identify the Ground wire if present.

Step 14: Find and label the Ground wire.

Step 15: Match and attach labeled wires using provided wire nuts.

Step 16: Confirm secure attachment of wire nuts.

Step 17: Attach the KS230 to the switch box using provided screws.

Step 18: Restore power.

Step 19: Connect provided faceplates securely.

Installation complete. Proceed to the Setup process and connect the KS230 to home WiFi using the Kasa app.


In a world where technology is a big part of everything we do, a 3-way smart light switch is a big step towards a smarter, more efficient home. From switches to app-controlled dimmers, we’ve always tried to find ways to make things easier, look better, and last longer.

By following the exact steps in this guide, you’ve entered the world of do-it-yourself home repairs and made your living places more adaptable to your mood and needs. Wiring and safety had to be done carefully during installation, but the rewards were great.

Imagine making great lighting for parties, relaxing, or working without getting up from your chair. Your house can be controlled by touch, voice, or your phone.

As you enjoy the dim lights, think about how far you’ve come from dealing with complicated wiring to add new technology to your home’s infrastructure easily. As smart houses become more common and the line between innovation and everyday life blurs, your accomplishment shows that things are improving.

3 Way Smart Dimmer Switch FAQs

What is a 3-way smart dimmer switch?

A 3-way smart dimmer switch is a modern home automation device that lets you change the brightness of your lights from multiple places using a smartphone app, voice commands, or by hand. It changes one of the switches in a 3-way lighting circuit, gives you better control over the lights, and saves energy.

Can I install a 3-way smart dimmer switch myself?

Yes, you can install a 3-way smart dimmer switch yourself if you know a lot about electrical wires and take care to avoid accidents. But if you need help with electrical systems or feel unsafe doing so, it’s best to call a licensed electrician for assistance.

What tools do I need to install a 3-way smart dimmer switch?

You’ll need tools like screwdrivers, wire strippers, wire nuts, needle-nose pliers, a circuit tester, electrical tape, wire labels, and safety gear. Read the post for a complete list of the tools you’ll need.

Is it essential to turn off the power before installing it?

Yes, for sure. To keep yourself safe and avoid getting an electrical shock, turn off the power to the wire you are working on. Always use a voltage tester to ensure the cables are not getting electricity before you start.

Can I use a 3-way smart dimmer switch in any lighting setup?

A 3-way smart dimmer switch is made for 3-way lighting systems, in which two different buttons can turn a single light on and off. If you need to learn how to set up your lighting, look at the manufacturer’s directions or talk to a professional.

How does a 3-way smart dimmer switch save energy?

You can save energy with a 3-way smart dimmer switch that lets you change your lights’ brightness based on what you need. By turning down the lights, you use less energy, and your bulbs last longer, which saves you money and energy over time.

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David Coleman
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