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Install your ecobee3 with confidence.

Follow along our step-by-step guide and videos to complete the self-installation.

Check compatibility
First Things First

Here’s what you’ll find in the box.

Thermostat
Backplate and trim plate
Large trim plate
Power Extender Kit (PEK)
Room sensor

Also included

Room sensor stand

Screws and drywall plugs

Double-sided adhesives

Wire labels

Installation guide

Quick start guide

Tools you'll need

Required

Drill (3/16” drill bit)

Phillips screwdriver

Optional

Hammer

Pencil

Wire stripper

Installing your ecobee is as easy as downloading this app.

How to install your ecobee3.

Start Here

Remove your thermostat

The steps in this video will help you decide which install guide you’ll use to complete the installation.

Guide 1

Install with a C wire

If you have a C wire, it will power your ecobee. You won’t need the PEK included in the box.

Guide 2

Install without a C wire

If you don’t have a C wire, you’ll need to use the PEK included to reliably power your ecobee.

How to set up your ecobee

Guides and manuals

Wiring diagrams

Helpful Resources

Find a certified pro to help you install

Meet your ecobee3 lite.

  • System Mode shows your current ecobee setting
  • Humidity shows the indoor humidity in your home
  • Indoor Temperature
  • Menu controls your system, schedule and more
  • Temperature slider controls your preferred temperature
  • Remote Sensor reads the temperature and occupancy in the rooms
  • Quick Changes allows you to switch from Home and Away settings
  • Weather shows local weather and weekly forecast
Troubleshooting

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

Check that all wires are properly inserted into the terminal blocks at the thermostat. Tug on the wires to ensure they are not loose.
Some HVAC equipment has a safety switch that cuts off power to the equipment if the equipment cover panel is not closed properly. Please ensure the cover panel of the equipment is closed properly.
If you installed the PEK, ensure R wire is connected to Rc only and G wire is inserted properly into the terminal.
If you have a multi-meter, please check the AC voltage between Rc and C or Rh and C and ensure it is 24V.