How to Set Up 2-Way or Multiway Switching with Lightwave

With Lightwave Smart Series dimmers, there are two ways to achieve this:

Recommended: Wireless Multiway Switching — One dimmer is physically wired (the “master”), and all others operate wirelessly via app automation (this works without internet connectivity)
Alternative: Traditional Wiring — For those with existing two-way or three-way wiring, Lightwave dimmers can be wired conventionally.

Option 1: Wireless Multiway Switching (Recommended)

Lightwave’s clean and modern method avoids the need for complex cabling.

Key Requirements:

Only one dimmer is wired to the lighting circuit (the master).
Secondary/slave dimmers must have permanent Live and Neutral power, or be connected via a separate dimmable lighting circuit to the primary channel (labelled dimmer 1 at the back of the dimmer), ensuring they receive constant power.

Benefits:

No need for three-core wiring.
Works with any number of switches.
Reliable operation—even without internet.
Spare gangs can be repurposed as “Magic Buttons” for other automations.

Best Practice Summary:

Wire dimmers as “1-way” only.
Connect Live + Switched Live for the master dimmer.
Provide permanent Live + Neutral to secondary dimmers.
In the app, secondary dimmers show an “S” symbol once set up in a 2-way switching automation and are used for physical control only.
Consider placing secondary dimmers in a separate room in the app to keep your device list tidy.

Option 2: Traditional Wiring (For Existing Circuits)

This method lets you reuse existing two-way wiring setups.

Before You Begin:
Turn off the power at the consumer unit. Take photos of the current wiring before removal. When in doubt, consult a qualified electrician.

Identify Your Wiring System

Three-Wire System: Each switch has one wire in L1, L2, and C.
Two-Wire System: One switch has multiple wires in L1 and L2; the other does not.

(Add wiring diagrams here for visual clarity.)

Two-Wire System Wiring

Move wires from L1 → L terminal on the Lightwave dimmer.
Move wires from L2 → X terminal.
Wires in C are not required and can be safely terminated.

Three-Wire System Wiring

First switch: L1 → L, L2 → X, C → L.
Second switch: L1 → L, L2 → X, C → X.

Intermediate Switching (More Than Two Switches)

If one switch has two sets of L1/L2 terminals (an intermediate switch):

Connect one set to L, and the other to X on the Lightwave dimmer.
Complete app setup using the Two-Way Switching automation.

App Setup (Required for Both Methods)

Complete the setup in the Lightwave app to synchronize your switches:

Launch the Lightwave Link Plus app (starts on the Favourites page).
Tap the green + icon → select Automations.
Choose Two-Way Switching.
Select the devices (dimmers) configured for two-way operation for the particular 2-way/multi-way circuit e.g. Hallway
Tap Next, choose the master device, then tap Next.
Enter a name for the automation → tap Done.
The master dimmer will flash green and white during calibration. Once it stops and returns off, the setup is complete.

Extra Tips

Minimum Load: Ensure 10 W per wired dimmer (especially for traditional wiring).
Magic Buttons: Spare gangs can control scenes, relays, or other devices.
Calibration: Finish setup with calibration in the app to optimise performance.
Power for Slave Dimmers: Always ensure secondary units have constant power—either via permanent Live and Neutral or via a dimmable lighting circuit wired to the primary channel (dimmer 1)

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