ElitePRO S1100 Smart Thermostat

Honeywell Home ElitePRO S1100 Smart Thermostat

The Honeywell Home ElitePRO S1100 Smart Thermostat is a connected thermostat designed to control compatible residential heating and cooling systems. It features a touchscreen interface, dual-band WiFi connectivity, customizable display options, indoor room prioritization, and remote control through the First Alert by Resideo app.

The ElitePRO S1100 is available in two versions: THX1100W3 with a white finish and THX1100B4 with a black finish.

The thermostat displays the current indoor temperature, selected temperature setpoint, system mode, fan mode, indoor humidity, indoor air quality information, weather, and time. Its touchscreen provides access to temperature adjustments, preferences, scheduling-related features, and connected equipment controls.

Through the First Alert by Resideo app, the thermostat supports Auto Away, smart scheduling, alerts, reminders, monthly energy reports, and remote thermostat control. Compatible wireless indoor room sensors can also be used to prioritize the temperature of selected rooms.

The ElitePRO S1100 supports Matter connectivity, allowing compatible Matter controllers to manage thermostat temperature setpoints and system modes through supported automations.

When configured with compatible indoor air quality equipment, the thermostat can also provide humidity and ventilation controls.

This guide explains the touchscreen controls, mobile app connection, WiFi setup, display customization, room prioritization, indoor air quality settings, Matter pairing, and troubleshooting procedures.

Technical Specifications

Actual temperature settings and available controls may be limited by thermostat configuration or installer-defined range stops.

Thermostat Models and Color Options

The ElitePRO S1100 is available in two model variants.

Both versions belong to the ElitePRO S1100 Smart Thermostat product family.

Thermostat Touchscreen and Display Guide

The ElitePRO S1100 provides a color touchscreen with several controls and information areas.

The Home screen presents the current indoor conditions, thermostat operating modes, and selected temperature.

Home Screen Components

Current Temperature Display

The Home screen shows the current indoor temperature.

This represents the temperature being measured by the thermostat.

Temperature Setpoint Display

The selected temperature appears separately from the current room temperature.

The temperature adjustment arrows are positioned beside the setpoint.

System Mode

The System Mode area identifies the selected heating or cooling operating mode.

The thermostat instructions reference the following modes:

• Heat
• Cool
• Emergency Heat
• Auto

Available modes depend on the connected heating and cooling equipment and the thermostat configuration.

Fan Mode

The Fan Mode control is displayed on the Home screen.

It provides access to the fan’s operating mode.

Menu

The Menu provides access to additional thermostat settings and features, including:

• WiFi
• Preferences
• Room Priority
• Matter
• Humidification
• Dehumidification
• Ventilation

Some menu options depend on the equipment and features configured for the installation.

Indoor Humidity Display

The thermostat can display indoor humidity information on its Home screen.

When the thermostat is configured to control humidity equipment, additional humidification or dehumidification settings become available.

Indoor Air Quality Display

The Home screen includes an indoor air quality information area.

The displayed example identifies indoor air quality with a status reading of Good.

When compatible equipment is configured, indoor air quality functions can be managed through the thermostat or First Alert app.

How to Adjust the Temperature

The ElitePRO S1100 displays the desired temperature setpoint on its touchscreen.

Changing the Temperature Setpoint

1. Open the thermostat Home screen.
2. Locate the Set Temperature area.
3. Use the displayed temperature adjustment arrows to change the desired temperature.
4. Check the selected temperature shown on the screen.

The thermostat’s selected operating mode determines which temperature setting is being adjusted.

Temperature Setpoint Ranges

The user guide identifies the following ranges when discussing restricted temperature adjustments.

Installer settings may restrict the selectable temperature range.

If the thermostat does not allow the required temperature to be selected, the operating mode and any configured range stops should be checked.

Temperature Adjustments Restricted by Lockout

If the display shows Unlock, the thermostat owner may have enabled a lockout setting.

This restriction can prevent temperature adjustments.

The owner-defined lockout settings must be addressed before unrestricted adjustments can be made.

Connecting the Thermostat to WiFi

The ElitePRO S1100 supports dual-band WiFi connections.

Compatible WiFi frequencies include:

• 2.4 GHz
• 5 GHz

A WiFi connection allows the thermostat to use supported internet-connected features.

How to Connect the ElitePRO S1100 to WiFi

1. Touch Menu on the thermostat screen.
2. Scroll through the available menu options.
3. Select WiFi.
4. Follow the instructions displayed on the screen.
5. Enter the WiFi network name (SSID).
6. Enter the WiFi password.
7. Complete the on-screen connection process.

The thermostat requires the correct network name and password to connect successfully.

WiFi Connection Requirements

If the connection fails, the troubleshooting procedures below should be followed.

Connecting the ElitePRO S1100 to the First Alert by Resideo App

The thermostat can be connected to the First Alert by Resideo mobile app.

The app provides remote control and additional connected features.

How to Get the First Alert App

The manufacturer’s app download page is:

https://info.firstalert.com/FA-app-download

The QR code printed in the thermostat user guide also directs users to the app connection process.

Mobile App Connection Instructions

1. Access the First Alert by Resideo app download page using the provided link or QR code.
2. Follow the app installation and connection instructions.
3. Complete the prompts for connecting the ElitePRO S1100 thermostat.
4. Use the app to access the supported thermostat functions.

First Alert by Resideo App Features

The First Alert app provides several connected thermostat features.

Auto Away and Smart Scheduling

Auto Away and Smart Scheduling are available as connected features through the First Alert app.

These functions support automated temperature management and scheduling.

Alerts and Reminders

The app provides access to supported thermostat alerts and reminders.

Monthly Energy Reports

Monthly energy reports are available through the app.

Remote Thermostat Control

The First Alert app supports thermostat control from outside the home.

This provides access to supported thermostat functions without requiring physical interaction with the device.

Monitoring Other Compatible Devices

The app can also monitor compatible:

• Water leak detectors
• Smoke detectors
• Carbon monoxide detectors

These detectors are sold separately.

Energy Rebates and Incentives

The ElitePRO S1100 user guide provides a resource for identifying energy providers that offer thermostat incentives and rebates.

Available programs can be searched through:

https://resideo.info/utility-savings-programs

Available incentives depend on the energy provider and applicable program requirements.

How to Customize the Idle Screen

The ElitePRO S1100 allows the idle screen’s appearance to be customized.

The thermostat offers seven different display styles and colors.

These options allow the display to be configured according to user preferences.

How to Change the Idle Screen

1. Touch Menu.
2. Select Preferences.
3. Select Display.
4. Select Idle Screen.
5. Choose the preferred display style.
6. Preview the selected appearance.
7. Select Save to store the setting.

Idle Screen Settings Path

Menu > Preferences > Display > Idle Screen

Display Customization Options

The thermostat allows selection from seven different idle-screen styles and colors.

The customization interface includes a preview feature so that the selected appearance can be checked before it is saved.

How to Prioritize Rooms for Comfort

The ElitePRO S1100 supports room prioritization using compatible wireless indoor room sensors.

This feature allows temperature control to focus on selected areas of the home.

How Room Prioritization Works

Compatible wireless indoor room sensors can be used to prioritize different rooms.

The user can manually select which rooms should receive priority.

Alternatively, compatible sensors can automatically determine room priority when activity is detected.

Manual Room Prioritization

Manual room prioritization allows selected rooms to be used for temperature averaging.

The manufacturer illustrates a configuration involving multiple selected rooms, with room tiles displayed on the thermostat.

Activity-Based Room Prioritization

When compatible wireless room sensors are used, the thermostat can allow room priority to change automatically according to detected activity.

How to Open Room Priority Settings

1. Touch Menu.
2. Scroll through the menu.
3. Select Priority.
4. Use the available room priority controls.

Room Priority Settings Path

Menu > Priority

Room Priority Options

Compatible wireless indoor room sensors are required for room-based priority features.

Indoor Air Quality Controls

The ElitePRO S1100 supports indoor air quality control when the thermostat has been configured to operate compatible equipment.

Depending on the installation, the following functions may be available:

• Humidification
• Dehumidification
• Ventilation

These settings can be adjusted through the thermostat’s user menu or the First Alert app.

Humidification Control

When the thermostat is configured to control humidification equipment, the Humidification menu can be used to access its settings.

Menu path: Menu > Humidification

Dehumidification Control

When dehumidification equipment has been configured, the Dehumidification menu provides access to the associated controls.

Menu path: Menu > Dehumidification

Ventilation Control

The Ventilation menu provides control options for a configured ventilation system.

How to Open Ventilation Settings

1. Touch Menu.
2. Scroll through the available options.
3. Select Ventilation.
4. Use the available ventilation controls.

Menu path: Menu > Ventilation

The ventilation interface illustrated in the guide includes automatic and off control options.

Indoor Air Quality Menu Overview

The available options depend on the connected equipment and thermostat configuration.

How to Set Up Matter

The ElitePRO S1100 supports Matter connectivity.

Matter allows compatible smart home controllers to operate supported thermostat functions through enabled automations.

Matter Functions

The thermostat supports Matter-enabled control of:

• Temperature setpoints
• System mode

How to Connect the ElitePRO S1100 with Matter

1. Touch Menu on the thermostat.
2. Scroll through the available settings.
3. Select Matter.
4. Follow the instructions displayed on the thermostat screen.
5. Open the pairing procedure on the compatible Matter controller.
6. Scan the QR code shown on the thermostat screen or use the displayed pairing code.
7. Follow the controller’s instructions to complete pairing.

Matter Settings Path

Menu > Matter

Matter Pairing Methods

After pairing, supported Matter automations can control thermostat temperature setpoints and system mode.

Troubleshooting Guide

The following troubleshooting procedures address display, compressor protection, temperature adjustment, and WiFi connection problems.

Troubleshooting Table

Thermostat Display Is Blank

A blank display may indicate that the heating and cooling equipment is not receiving electrical power.

Recommended Actions

1. Check the circuit breaker.
2. Reset the breaker if necessary.
3. Make sure the heating and cooling system’s power switch is turned on.
4. Check that the furnace door is closed securely.

Waiting for Equipment Message

The thermostat may display:

Waiting for equipment

This message indicates that the compressor protection feature is active.

The compressor protection delay prevents the system from restarting too quickly.

Recommended Action

Wait approximately five minutes for the system to restart safely.

The delay helps protect the compressor from damage.

Cannot Change the Temperature Setpoint

If the selected temperature cannot be changed, one of the following conditions may apply.

Owner-Defined Lockout

If the display shows Unlock, the thermostat owner may have enabled a lockout setting.

Incorrect System Mode

Verify that the thermostat is operating in the intended system mode, such as Heat, Cool, Emergency Heat, or Auto.

Installer-Defined Range Stops

The thermostat may be configured with limits restricting the available temperature range.

If heating cannot be adjusted within 40–90°F (4.5–32°C), or cooling cannot be adjusted within 50–99°F (10–37°C), range stops may be restricting the settings.

Recommended Action

Contact the installer to determine whether temperature range stops have been configured.

WiFi Troubleshooting

The ElitePRO S1100 supports 2.4 GHz and 5 GHz WiFi networks.

Connection problems may result from incorrect credentials, router IP address configuration, or lack of internet access.

WiFi Connection Fails Because of an Incorrect Password

Possible Cause: The entered WiFi password is invalid.

Recommended Action

1. Check the WiFi network password.
2. Reopen the thermostat’s WiFi setup.
3. Enter the correct password.
4. Follow the on-screen connection process.

No IP Address Assigned by the Router

Possible Cause: The router has not assigned an IP address to the thermostat.

Recommended Actions

1. Verify that the router is configured to assign IP addresses automatically using DHCP.
2. If DHCP is already enabled, remove the ElitePRO thermostat from its wall plate to disconnect power.
3. Wait approximately 10 seconds.
4. Reattach the thermostat to the wall plate.
5. Repeat the WiFi setup process.

No Internet Link

Possible Cause: The router or network connection does not provide internet access.

Recommended Actions

1. Check the router settings.
2. Restart the router if necessary.
3. Attempt to connect the thermostat again.

WiFi Connection Checklist

Regulatory and Compliance Information

The ElitePRO S1100 includes wireless communication functions and is subject to applicable radio-frequency regulations.

FCC Regulations

The thermostat complies with Part 15 of the FCC Rules.

Operation is subject to two conditions:

1. The device must not cause harmful interference.
2. The device must accept received interference, including interference that may cause undesired operation.

Changes or modifications not expressly approved by the responsible compliance authority may void the user’s authority to operate the equipment.

Additional FCC information is available at:

https://customer.resideo.com/en-US/support/residential/codes-and-standards/FCC15105/Pages/default.aspx

Canadian IC Regulations

The thermostat contains licence-exempt transmitters or receivers that comply with applicable Innovation, Science and Economic Development Canada licence-exempt RSS requirements.

Operation is subject to the following conditions:

1. The device must not cause interference.
2. The device must accept interference, including interference that may cause undesired operation.

RF Exposure Requirements

The transmitter antennas must be installed with a minimum separation distance of 20 cm from all persons.

The antennas must not be co-located or operated together with another antenna or transmitter.

Operation in the 5150–5250 MHz and 5250–5350 MHz frequency bands is restricted to indoor use to reduce the potential for harmful interference to co-channel mobile satellite systems.

IFT Regulations

The device is also subject to IFT operating conditions.

It must not cause harmful interference and must accept received interference, including interference that may cause undesired operation.

Electronic Waste Disposal

The ElitePRO S1100 must not be discarded with ordinary household waste.

At the end of its service life, the thermostat should be taken to an authorized collection center or electronic equipment recycler.

Proper electronic waste disposal helps reduce potential environmental and health impacts.

Warranty Information

The Honeywell Home ElitePRO S1100 Smart Thermostat is covered by a 5-year limited warranty.

Professional Installation Requirement

The ElitePRO S1100 is classified as a trade product.

The warranty may be void if the thermostat is not installed by a professional.

Warranty Information

Warranty details and applicable terms are available at:

https://resideo.info/US-Warranty-THERMOSTAT

Requesting a Printed Warranty

A printed copy of the warranty can be requested from Resideo Customer Care.

Telephone: 1-800-633-3991

The manufacturer states that a printed warranty copy will be mailed free of charge.

Customer Support Information

The ElitePRO S1100 Smart Thermostat is manufactured by Resideo Technologies, Inc. and its affiliates.

The Honeywell Home trademark is used under license from Honeywell International Inc.

Manufacturer Address

Resideo Technologies Inc.

Scottsdale, AZ 85254

United States

When to Contact the Installer

The professional installer should be contacted if:

• Temperature range stops prevent the required setpoint adjustment.
• Owner or installer configuration settings require assistance.
• The thermostat’s connected heating and cooling equipment requires service.

For warranty questions and manufacturer assistance, contact Resideo Customer Care.

Frequently Asked Questions

1. How do I connect the Honeywell Home ElitePRO S1100 thermostat to WiFi?

Touch Menu on the thermostat, scroll to WiFi, and select it. Follow the on-screen instructions to enter the wireless network name (SSID) and password. The thermostat supports both 2.4 GHz and 5 GHz WiFi networks. 

If the connection fails, verify the password, confirm that DHCP is enabled on the router, and check internet connectivity.

2. How do I change the idle screen on the ElitePRO S1100?

Touch Menu, then select Preferences, Display, and Idle Screen. Choose one of the seven available display styles and colors. Use Preview to check the selected appearance, then select Save to store it.

3. Why does my ElitePRO S1100 display Waiting for equipment?

The Waiting for equipment message indicates that compressor protection is active. The thermostat temporarily delays equipment operation to prevent the compressor from restarting too quickly. Wait approximately five minutes for the heating or cooling system to restart safely.

4. How do I connect the ElitePRO S1100 to Matter?

Touch Menu, scroll to Matter, and select it. Follow the thermostat’s on-screen instructions. Use a compatible Matter controller to scan the QR code displayed on the thermostat or enter the displayed pairing code. 

5. Why can’t I change the temperature on my ElitePRO S1100 thermostat?

The thermostat may have an owner-defined lockout, an incorrect operating mode, or installer-configured temperature range stops. If Unlock appears, a lockout setting may be active. Confirm the intended Heat, Cool, Emergency Heat, or Auto mode. If the temperature remains restricted, contact the installer to check the range-stop settings.

6. Can the ElitePRO S1100 prioritize temperatures in different rooms?

Yes. Compatible wireless indoor room sensors allow selected rooms to receive priority. Rooms can be selected manually, or compatible sensors can automatically determine priority based on detected activity. The feature is accessed through Menu > Priority.

8. What is the warranty on the Honeywell Home ElitePRO S1100?

The ElitePRO S1100 has a 5-year limited warranty. It is classified as a trade product, and warranty coverage may be void if installation is not performed by a professional. Warranty information is available at resideo.info/US-Warranty-THERMOSTAT.

 A printed warranty copy can be requested by calling Resideo Customer Care at 1-800-633-3991.