Honeywell Home T9 and T10 Pro Product Support Resources

Need help installing or using your T9 or T10 Pro Smart Thermostat or room sensors? Our helpful FAQ’s and user guides are packed with useful information.

Honeywell Home Smart Thermostats Helpline : 1-800-633-3991

(Choose Option 1 for Homeowner, followed by Option 1 again for T9 support.)

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Frequently Asked Questions

What does the new T9 and T10 Smart Thermostat consist of?

The product features a Smart Thermostat, wireless smart room sensors and the Honeywell Home app. You can purchase the thermostat and sensors separately or bundled. Together, they effortlessly deliver comfort when and where it’s needed. The T-Series smart thermostats connect to the smart room sensors via a proprietary 900 MHz wireless radio that can connect to the thermostat up to a 200 foot range providing a reliable connection to monitor temperature and humidity.

How does the T9/10 differ from other brands’ smart thermostats with sensors?

Not all sensors are created equal; the new T-Series smart room sensors have a thermostat-to-sensor range up to 200 feet.

The T9/T10 smart room sensors monitor motion/people detection in rooms, enabling the thermostat to automatically adjust the temperature when a room becomes occupied, which isn’t available in all other comparable products. This is important because the thermostat knows which room to prioritize when.

The one-touch priority adjustments on the thermostat, Honeywell Home App, or with a voice assistant (Google Assistant or Amazon Alexa) flex with your life.

The Smart Thermostat’s intuitive touch display allows you to scroll menus right on the thermostat, personalizing your controls, and is very similar to the mobile app experience.

The T9 Smart Thermostat is has wire-sensing technology and can determine if each wire is correctly connected on each end of the wire.

The thermostat can configure itself – just answer a few simple questions to get started. The included C-Wire adapter provides compatibility in homes that don’t have a C-Wire present at the thermostat, so it’s compatible with most homes.

What’s the difference between the T9/T10?

The T10 Pro is sold through our professional HVAC installers. It offers additional controls that enable HVAC contractors to tailor the thermostat to your specific equipment’s capabilities. The T10 also offers the ability to control humidifiers, dehumidifiers and ventilation. It’s installed by a professional and gives the installer a broader range of installation options to synchronize all those indoor air quality devices.

Does this thermostat have any learning capabilities?

Yes, it has “Smart Response” and “Adaptive Recovery,” which learns how long it takes the home to heat or cool itself. For example, if you want your bedroom set to 70 degrees when you wake up at 6 am, the system knows it takes 30 minutes to heat your home, so the furnace will start heating at 5:30 am. Likewise, if you want a cool bedroom, 65 degrees, at 10 pm, the system takes in to account how long it typically takes your home to reach that point.

Tell me about the difference between Smart Room Sensors and a zoned HVAC system.

The thermostat uses up to 20 wireless sensors to read temperatures in multiple rooms of your home. Based on your preferences, the thermostat can read from, and average, these multiple sensors and the thermostat. The T9 and T10 Smart Thermostat will calculate the average of the temperatures detected in all selected or active rooms to deliver the best temperature to your whole home. In this way, the T9 and T10 Smart Thermostats work with the sensors to make you feel closer to your desired temperature, wherever you are in the home.

While the T9 and T10 thermostat can better fine-tune your comfort in your home, it’s important to distinguish that no thermostat alone, regardless of sensors, can maintain separate temperatures in different rooms without air dampers or smart vents. Honeywell Home provides a true zoning solution that can be purchased through a professional contractor at www.honeywellhome.com/contact-a-pro.

For homes that already utilize a zoning solution, such as a zone control board or duct dampers, Smart Room Sensors can still help further increase comfort and savings by providing a more accurate reading of the temperature in each zone. A T9 or T10 Smart Thermostat would be required for each zone being controlled, and each thermostat will require its own sensors, based on your desired level of control. Smart Room Sensors cannot connect with more than one thermostat.

If you have any questions about whether or not the T9 and T10 Smart Thermostat is the best option for your home, you can contact our support team or find a local pro.

If you don’t have dampers how do you control the temperature in just that room?

When you adjust the temperature in one room, it will impact the temperature in the rest of your home. For example, if your basement is regularly 4 degrees cooler than your bedroom, it will continue to be slightly cooler as you adjust the temperature to meet your bedroom preferences. If the bedroom and the basement are both selected as priority rooms, the thermostat will average the temperature of those two rooms, and your basement will still be cooler than your bedroom.

When using active rooms, how long are those rooms considered “Active” after motion has last been detected?

The sensor has an occupancy algorithm based on how many motion events it sees within a certain timeframe. This was set up so that if someone briefly walks through a room, the sensor will tell the thermostat that the room is “occupied” for 10 minutes. If someone is in a room longer, then the timeout will be increased automatically.

Sensors communicate directly with the thermostat via Honeywell Home RedLINK technology. After sensing motion, the communication should take less than 3 seconds to assign the room priority, depending on battery and signal strength.

What if my thermostat is set to monitor Active Rooms, but none of the rooms are active?

If none of the sensors are detecting people in the rooms in which they’re placed, the thermostat will default to sense from its location in the home. If geofencing is turned on, and the Honeywell Home app senses that none of the users are home, geofencing technology will turn the thermostat to your ‘away’ temperature.

What does room prioritization mean and how does it work?

You can select which rooms/smart room sensors you want your thermostat to focus on (which rooms it should measure). For example, during nap time, you may want the nursery room prioritized so the baby sleeps at the ideal temperature. In this case, you can set the priority via a simple voice command; or those rooms are prioritized when people are detected in them. You can even select multiple rooms to be prioritized, like all 3 of the bedrooms, and the thermostat will heat or cool the home based on an average of those rooms.

How does motion-based priority work with multiple people in the house?

If the thermostat’s priority is set to ‘Active Rooms’, then any room that detects motion will become prioritized. The average of those rooms’ temperatures will be monitored so that the thermostat can adjust to your preferred temperature setpoint. If one of the sensors no longer detects people in that room, that sensor will adjust after a period of time, using the algorithm based on motion events that it sees within a certain timeframe.

How does the sensor detect people?

The sensor is designed to detect large infrared heat sources (people), so it won’t detect small animals on the ground or an automatic vacuum cleaner. We use the same technology that’s in our Smart Home Security Motion Sensors.

My home has 3 bedrooms on one level and a basement; how many sensors should I use?

The rule of thumb is to use a smart sensor in each room where you spend a lot of time, and where the ideal temperature is important to you. We recommend one sensor in each bedroom, a sensor in the kitchen/living room, and a sensor in the basement.

Do the smart room sensors work with other Honeywell Home thermostats?

Smart Room Sensors work only with the T9 and T10 Smart Thermostats.

How does the sensor detect motion?

The sensors use a Passive Infrared Sensor (PIR) detector to detect motion.

Tell me about the difference between Smart Room Sensors and a zoned HVAC system.

The thermostat uses up to 20 wireless sensors to read temperatures in multiple rooms of your home. Based on your preferences, the thermostat can read from, and average, these multiple sensors and the thermostat. The T9 and T10 Smart Thermostat will calculate the average of the temperatures detected in all selected or active rooms to deliver the best temperature to your whole home. In this way, the T9 and T10 Smart Thermostats work with the sensors to make you feel closer to your desired temperature, wherever you are in the home.

While the T9 and T10 thermostat can better fine-tune your comfort in your home, it’s important to distinguish that no thermostat alone, regardless of sensors, can maintain separate temperatures in different rooms without air dampers or smart vents. Honeywell Home provides a true zoning solution that can be purchased through a professional contractor at www.honeywellhome.com/contact-a-pro.

For homes that already utilize a zoning solution, such as a zone control board or duct dampers, Smart Room Sensors can still help further increase comfort and savings by providing a more accurate reading of the temperature in each zone. A T9 or T10 Smart Thermostat would be required for each zone being controlled, and each thermostat will require its own sensors, based on your desired level of control. Smart Room Sensors cannot connect with more than one thermostat.

If you have any questions about whether or not the T9 and T10 Smart Thermostat is the best option for your home, you can contact our support team or find a local pro.

Which smart home apps are compatible with the T9/T10?

Currently only Amazon Alexa and Google Assistant can view and control both the thermostat and sensors.

HomeKit, IFTTT, SmartThings and Cortana will allow you to change setpoints on your thermostat, but cannot view the sensor readings at this time.

Can I ask my voice assistant, like Amazon Alexa, Google Home and others, for sensor temperatures?

Once you’ve linked your voice assistant to the Honeywell Home skill, you can ask your voice assistant to raise the temperature, set the temperature, change the mode, and more. Plus, you can ask Google Assistant or Amazon Alexa to “set the bedroom to 72 degrees” and the priority mode will change to ‘selected rooms,’ and the bedroom will then be the only selected room. Get more information about our partners.

Do the T9/T10 have Z-Wave integrated?

No, these are not Z-Wave thermostats, for those installations, we recommend the T6 Pro thermostat or the T5 Z-Wave Thermostat.

Do I need a c-wire to install the T9 Smart Thermostat?

No, the T9 Smart Thermostat comes with a c-wire adapter so it’s compatible with homes that do not have a c-wire.

“Can’t Enter Enroll Mode – another device is in enroll mode. Please try again later”

Check for other RedLINK capable devices that are in enrollment mode (this mode is displayed on thermostat screens or via flashing lights on sensors). Make sure to complete the setup of those devices. Once you’re certain no other devices are in enrollment mode, reset your thermostat by either gently pulling it off the wall near the base of the thermostat, allowing for one minute to pass, then placing it back on the wall, or by turning the service switch on your furnace/AC system off for 30 seconds. The device should recover within about 10 minutes.

When pairing a Smart Room Sensor, the green light is steady and/or flashes red after pressing “connect” button on sensor (rather than flash green rapidly while pairing).

Reset the sensor by pressing and holding the Connect button on the sensor until the orange light appears (after about 15 seconds). Then try adding the sensor to the thermostat again.

“Indoor Sensor Connection Error”
“Error Adding Device – The device could not be added, please try again”

First, reset the sensor by pressing and holding the Connect button on the sensor for about 15 seconds, then, with the sensor within 2 feet of the thermostat, try adding it again. Next, if you’re still having issues, replace the sensor batteries and retry. Finally, try removing the batteries for 30 seconds and re-inserting them to clear the error. Look for large appliances or metal and concrete walls that may reduce the signal strength. Place the sensor within the least-obstructed, straight-line path to the thermostat. Then, try adding the sensor to the thermostat.

“Indoor Sensor Connection Error”
“Error Adding Device – The device could not be added, please try again”

First, reset the sensor by pressing and holding the Connect button on the sensor for about 15 seconds, then, with the sensor within 2 feet of the thermostat, try adding it again. Next, if you’re still having issues, replace the sensor batteries and retry. Finally, try removing the batteries for 30 seconds and re-inserting them to clear the error. Look for large appliances or metal and concrete walls that may reduce the signal strength. Place the sensor within the least-obstructed, straight-line path to the thermostat. Then, try adding the sensor to the thermostat.

Failure to power on

Check your wiring to see if you have a C-wire. If you do not see a wire in the C terminal, refer to your Installation Guide / C-Wire Adaptor Guide to install using the c-wire adapter. Then, reset your thermostat by either gently pulling it off the wall near the base of the thermostat, allowing for one minute to pass, then placing it back on the wall, or by turning the service switch on your furnace/AC system off for 30 seconds. The device should recover within about 10 minutes.

“Error – Wi-Fi Connection Failed”

The T9/T10 thermostat works best with the following network configuration(s): DHCP enabled, no hidden SSIDs or network names, and a 2.4GHz or 5GHz network. If you have a dual band network where your 2.4GHz and 5GHz are combined into one, log into your internet service provider account to split the network into 2.4GHz and 5GHz separately. If connection still fails, reset your Wi-Fi router to clear out old memory and retry the connection.

"Incorrect Password – Please re-enter the password and try again"

The thermostat failed to connect to the local Wi-Fi network due to an incorrect password. Verify you have the correct password. You can verify your password by “forgetting” the Wi-Fi connection on your mobile device, then reconnecting and re-entering your password.

Honeywell Home app message: “Is the Thermostat Ready?”

The thermostat must be connected to the local Wi-Fi, and must be connected to the same Wi-Fi network as the mobile device that is being used to complete the setup.

Honeywell Home app message: “Unable to find Thermostat”

The thermostat must be connected to the same Wi-Fi network as the mobile device you are connecting it with. “Forget” other Wi-Fi networks on your mobile device. Routers or mobile devices that block UPnP may block the connection that takes place during this step in the setup process. Check with your local ISP to enable this service on your router.

Honeywell Home app message: “Registration Error – This thermostat is already registered to another account”

If you know the previous owner, ask them to delete the thermostat from their account (within the app, they’ll tap Settings, then Thermostat Configuration, then Delete Thermostat). If you don’t know the previous owner, contact Customer Care to unregister the thermostat at 1-800-633-3991.

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