Installing Your t5/T5+ Smart Thermostat

Before beginning the installation be aware that that the T5/T5+ Smart Thermostat:

• Is compatible with most heating, cooling, and heat pump systems
• Requires 24 VAC power (“C” wire). C-Wire Power Adapter included to provide power if needed
• Does not work with electric baseboard heat (120V - 240V)
• Does not work with millivolt systems
• Does not support input (S terminals) for indoor and outdoor sensors
• Does not support relay (U terminals) for ventilation
• Is compatible with Android or iOS smartphone, tablet, or device

Turn off the power at the breaker box or switch that controls your heating/cooling system.

If your old thermostat is digital the screen should be blank when the power is OFF.

If your old thermostat is not-digital try changing the temperature on it. If you don’t hear the system turn on within 5 minutes, the power is OFF.

Carefully remove your existing thermostat or cover from the wall. On most thermostats, you can do this by gently pulling on the device. On others, you may have to loosen screws.

*Please note that most thermostats are comprised of two parts a wall plate that is screwed to the wall and a faceplate that can be easily removed*

With the faceplate removed use your smartphone to take a picture of your wiring or draw a diagram to note which terminal each wire connects to. (When taking the picture, please make sure that the terminal markings are clearly visible).

Note: if you have a Honeywell Home Universal Wall Plate (UWP) you can skip to this step

Remove each wire one at a time and label it using the supplied wire labels. If your wire has multiple designations label that wire with the additional corresponding labels

After all wires have been removed and labelled, unscrew and remove the old thermostat wall plate from the wall

Did you have a wire connected to the C terminal?

Plug the wires into the wall plate by pressing the clamp down on the outside while pushing the wire into the hole that corresponds with its label.

Line up the pins on the back of the thermostat with the holes on the wall plate and push the thermostat onto the wall until you hear it snap into place.

Remove protective film over the thermostat face plate.

Turn system power back on at the breaker box.

Did the thermostat screen turn on?

Yes

For this phase in the installation you will be programming the thermostat either manually by following the prompts on the thermostat display or using the Honeywell Home app. To begin tap “Start Setup” on your thermostat.

Identify whether or not you wish to use the app for this setup

Follow the prompts in either the app or on the thermostat (depending on which you selected) to complete programming and complete the following:

1. Assign a name to your thermostat. Typically, this could be the room the thermostat is in (eg Living Room) or the section of the house the thermostat controls (eg Downstairs)
2. Select if you want the temperature to display in Fahrenheit or Celsius
3. For more detail on the equipment setup options for your system click the applicable link below:
   • Forced Air
   • Radiator / Boiler
   • Heat Pump
   • Air Conditioner

For this next phase you will be connecting your thermostat to your home’s Wi-Fi network. To complete this you will be using a combination of the thermostat’s display and the HoneywellHome mobile app.

Download and install the HoneywellHome app (if you haven’t already) then open the app and tap the T5 WiFi Thermostat under the “Add New Device” menu 

Please note that if you are already using the Honeywell Home app you will need to tap the “+” icon to add a new device

Press and Hold the center of the thermostat display to start the thermostat network

Turn on Airplane mode. **Please note that in order for this setup to be successful your phone and your thermostat need to be on the same Wi-Fi network. Turning on airplane mode will temporarily disable your phone’s cellular network**

Follow the prompt on your mobile phone to enable wifi and select the home network you connected your thermostat to.

Choose your thermostat on your mobile phone and tap yes to connect.

Wait for your mobile phone to register with your thermostat. This process can take 2-3 minutes to complete.

If this was not successful, please try again by going back through the steps of adding the T5 thermostat one more time.

If you are still unsuccessful try following the steps in this Wi-Fi connection troubleshooting guide.

For more information on how to use your thermostat or for any future support needs visit the T5/T5+ Smart Thermostat Support Page.