Installing DOOR Dimmer Switch

This guide covers installing a DOOR Dimmer Switch in place of a standard wall switch. It involves working with line-voltage (120 VAC) wiring, so if you are not comfortable doing so, hire a qualified, licensed electrician.

Important: Turn off the circuit at the breaker before you begin, and verify the power is off with a voltage tester. Do not work on live wiring.

Before you install: Record the device's serial number and photograph or scan the QR code on the label before mounting the Dimmer. Once it's installed in the box, the label is hidden and you can't read this information without removing the device again. You'll need it to add the Dimmer in the DOOR App.

About this device

The Dimmer Switch controls a dimmable light over its wired terminals and reports to the DOOR App through the DOOR Hub (it does not join WiFi). It requires a neutral wire and works only with the bulb types and loads listed below. Schedules and the timer run locally on the device.

Requirements

A neutral wire in the switch's electrical box. The Dimmer will not function without one; if absent, an electrician must add it.
A dimmable light within the load limits: LED 150 W, CFL/fluorescent 150 W, halogen 450 W, incandescent 450 W. Not for ceiling fans, receptacles, or motor/transformer-supplied loads.
120 VAC, 60 Hz circuit. Indoor location only.
A DOOR Hub installed and online, and the DOOR App signed in with Device Management permissions.

In the kit

Dimmer Switch
Faceplate screws (2) and electrical box screws (2)
Wire connectors (4)
Quick Start Guide

Tools

Medium Phillips and small slotted screwdrivers
Wire strippers or cutters
Multimeter or voltage tester

Steps

Turn off the circuit at the breaker. Test the existing switch and verify with a multimeter that the power is off.
Remove the faceplate and the old switch, and pull it from the box. Keep the screws.
Identify the wires: the ground (bare copper or green), the hot/line/live (usually black or red, often joined to other hot wires under a wire nut), the switch-leg/load wire to the light, and the neutral wire(s). If there are multiple neutrals, you may need a short jumper wire to connect them to the Dimmer.
Strip about ½ inch of insulation from each wire end and straighten it.
Terminate the wires on the Dimmer (see the wiring table). Tug each wire gently to confirm it's secure.
Record the serial number and QR code from the device label before mounting it. Once the Dimmer is in the box the label is no longer visible, and you'll need this information to add it in the DOOR App.
Push the switch into the box and secure it with the screws. Snap on the trim plate (in a multi-gang box, use the appropriate plate).
Restore power at the breaker.
Test by turning the light off and on at the switch.

Wiring table

Terminal	Wire
Live	Hot / line / live wire
Load	Switch-leg wire to the light
Neutral	Neutral wire (required)
Ground	Ground wire

Activate in the DOOR App

Add the Dimmer to the DOOR App: tap Devices → Add a device → scan the QR code (or enter the serial number) → follow the steps, and assign it to the correct Unit.

3-way (two-location) control

The Dimmer is not compatible with traditional 3-way wiring. For two-location control, wire two DOOR switches as standard switches and pair them with Control-D2D pairing (a local, paddle-hold procedure that needs no app). Follow 3-Way Switch Configuration for DOOR Dimmer & Power Switch.

Verification

The light turns off and on at the switch, and dims smoothly across its range.
The Status LED is green when on, red when off.
The Dimmer shows Online in the DOOR App, assigned to the correct Unit.

Troubleshooting

Switch won't power on / no LED — confirm the breaker is on and the neutral wire is connected; the Dimmer needs a neutral.
Light flickers at low brightness — run Dimming calibration in the app to set a minimum brightness.
For more, see DOOR Dimmer Switch troubleshooting.

Diagrams

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