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Install your ecobee3 lite 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.

Trim plate
Power Extender Kit (PEK)

Also included

Screws and drywall plugs

Wire labels

Installation guide

Tools you'll need


Drill (3/16” drill bit)

Phillips screwdriver




Wire stripper

Installing your ecobee is as easy as downloading this app.

How to install your ecobee3 lite.

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.

Not the DIY type?
Hire a professional installer to get your ecobee device up and running quickly.

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Pictued: Brendon Aldridge, owner & technician
ecobee-trained professional

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

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.
Make sure your HVAC cover panel is closed. Some systems will not turn on if the cover panel has not been closed properly.
If you have only one R wire (either R, Rc, or Rh), make sure it’s inserted into the Rc terminal. R (or Rc or Rh) to Rc

If you installed the Power Extender Kit, make sure you inserted the wires into the correct terminals.

R/RC/RH wire to RC terminal
G wire to C terminal
W/W1 wire to W1 terminal
Y/Y1 wire to PEK terminal