How to install ecobee3 lite.

In most homes, installing an ecobee thermostat is an easy process that takes about 45 minutes. Follow the steps below or scroll down for installation guides and videos, wiring diagrams, troubleshooting tips and more.

Check compatibility with your heating (and cooling) system
Download the ecobee app to install your thermostat

Download the ecobee app.

Installation Videos.

Install with a C wire

Install without a C wire

Guides and manuals

Full Install Guide

Wiring diagrams

Conventional heat/cooling

Heat pump with auxilliary heat

Dual transformer system

Installing with Power Extender Kit

Other installation resources

Compatibility Checker

What do my thermostat's wire labels mean?

Installation for 2-wire systems

Getting started with your ecobee3 lite

Get to know your Smart Thermostat

Set up and use Apple HomeKit

Set up and use Alexa

Discover eco+ smart features

Not the DIY type?

Hire a professional installer to get your ecobee device up and running quickly.

Brendon Aldridge, owner & technician

ecobee-trained professional

Find a pro

Troubleshooting
:
If your ecobee doesn’t turn on, please try these steps.

Check your wire and terminal connection

Check your HVAC cover panel

Ensure your R wire is inserted into the proper terminal

Ensure your wire and terminal connections in the Power Extender Kit are secure

For more help with your installation questions, visit the ecobee Support Center.

Here's what you'll find in the box.

ecobee3 lite
Backplate
Trim plate
Power extender kit (PEK)

Also included:

Screws and drywall plugs
Wire labels
Installation guide

Tools you'll need:

Required

Drill (3/16” drill bit)
Flathead screwdriver
Phillips screwdriver

Optional

Hammer
Pencil
Wire stripper