Ecobee Wiring Diagram: A Comprehensive Guide for Installation

Hello readers, welcome to our detailed guide on ecobee wiring diagrams. In this article, we will provide you with a step-by-step explanation of the ecobee wiring diagram installation process. Whether you are a homeowner or a professional installer, this guide will help you understand the wiring requirements for ecobee thermostats and ensure a successful installation.

1. Understanding the Basics of Ecobee

Before diving into the wiring diagram, let’s briefly discuss what ecobee is. Ecobee is a smart thermostat that offers advanced features to optimize energy usage and enhance comfort in your home. It allows you to control the temperature remotely through a mobile app and integrates with various smart home systems.

2. Ecobee Wiring Diagram Overview

The ecobee wiring diagram consists of several labeled terminals that correspond to specific wires. These terminals include Rc, Rh, C, W1, W2, Y1, Y2, G, O/B, and PEK. Each terminal serves a particular function in the heating and cooling system of your home.

Terminal Descriptions:

Terminal Description
Rc Provides power to the cooling system
Rh Provides power to the heating system
C Common wire for completing the circuit
W1 Controls the primary heating system
W2 Controls the secondary heating system (if applicable)
Y1 Controls the primary cooling system
Y2 Controls the secondary cooling system (if applicable)
G Controls the fan
O/B Controls the reversing valve for heat pumps
PEK Power Extender Kit terminal for systems without a C wire

3. Ecobee Wiring Diagram: Step-by-Step Installation Guide

To ensure a successful installation, follow these steps:

Step 1: Turn off Power

Before starting the installation process, turn off the power to your heating and cooling system by switching off the circuit breaker.

Step 2: Remove Existing Thermostat

Remove the cover of your existing thermostat and disconnect the wires from their respective terminals. Make sure to label each wire for easy identification during the ecobee installation.

Step 3: Mount the Ecobee Thermostat

Mount the ecobee thermostat base on the wall using the provided screws. Ensure that the base is level and securely attached.

Step 4: Connect the Wires

Refer to the ecobee wiring diagram and connect each wire to its corresponding terminal on the ecobee thermostat. Ensure a secure connection by tightening the terminal screws.

Step 5: Power on the System

Turn on the power to your heating and cooling system by switching on the circuit breaker.

Step 6: Set up the Ecobee Thermostat

Follow the on-screen instructions on the ecobee thermostat to complete the setup process. This includes connecting the thermostat to your Wi-Fi network and configuring the system settings.

4. Advantages of Using Ecobee Thermostats

Ecobee thermostats offer several advantages over traditional thermostats:

– Energy Savings: Ecobee thermostats use advanced algorithms to optimize energy usage and reduce heating and cooling costs.

– Smart Home Integration: Ecobee thermostats can be integrated with various smart home systems, allowing you to control the temperature through voice commands or mobile apps.

– Comfort Settings: With ecobee thermostats, you can create customized comfort settings for different times of the day, ensuring a comfortable environment at all times.

– Remote Access: The mobile app provided by ecobee allows you to control the thermostat remotely, providing convenience and flexibility.

5. Disadvantages of Using Ecobee Thermostats

While ecobee thermostats have numerous benefits, it is essential to consider the potential drawbacks:

– Initial Cost: Ecobee thermostats are generally more expensive compared to traditional thermostats. However, the long-term energy savings can offset the initial investment.

– Learning Curve: The advanced features and customization options of ecobee thermostats may require some time and effort to understand and utilize effectively.

– Compatibility: Ecobee thermostats may not be compatible with all heating and cooling systems. Before purchasing, ensure compatibility with your system.

6. Alternative Wiring Options

If the ecobee wiring diagram does not match your existing system, ecobee provides alternative wiring options on their official website. These options cater to various system configurations and can help you find a suitable wiring solution for your specific setup.

7. Frequently Asked Questions (FAQ)

Q: Can I install the ecobee thermostat myself?

A: Yes, ecobee thermostats are designed for easy installation. However, if you are not confident in your abilities, it is recommended to seek professional assistance.

Q: What is a C wire, and do I need one?

A: A C wire is a common wire that provides continuous power to the thermostat. While not always necessary, having a C wire eliminates the need for a power extender kit (PEK) and ensures optimal performance of the ecobee thermostat.

Q: Can I use the existing wiring from my old thermostat?

A: In most cases, the existing wiring can be used. However, it is essential to check the compatibility of your system with the ecobee thermostat and make any necessary adjustments.


In conclusion, the ecobee wiring diagram is a crucial resource for successfully installing an ecobee thermostat. Understanding the terminal functions and following the installation guide will ensure a smooth and efficient installation process. Take advantage of the advanced features offered by ecobee thermostats to optimize energy usage, enhance comfort, and create a smarter home environment.