Installing Your ecobee3 Lite

Beginner 30-45 minutes

What You'll Need

  • ecobee3 Lite
  • ecobee app (iOS or Android)
  • Wi-Fi network
  • Compatible HVAC system

Step-by-Step Setup

  1. Turn off power to HVAC system
  2. Remove old thermostat and photograph wiring
  3. Install backplate using included screws
  4. Connect wires to labeled terminals
  5. Mount thermostat to backplate
  6. Restore power
  7. Follow on-device setup:
    • Select language and location
    • Connect to Wi-Fi
    • Create ecobee account in app

Key Features

  • Budget-friendly ecobee option
  • Works with Alexa, Google, Siri
  • SmartSensor compatible
  • 7-day scheduling
  • Energy savings reports
  • Remote access via app
  • Touchscreen display

Troubleshooting

  • C-wire needed: May require Power Extender Kit (sold separately)
  • Sensor not pairing: Reset sensor and try again in app
  • Schedule not running: Check Home/Away settings
  • Reset: Menu → Settings → Reset