1. Introduction
The Honeywell Lyric T6R Wireless Smart Thermostat offers advanced control over your home heating system with a modern design and smart connectivity features. It features a dynamic LCD touchscreen display for precise feedback and intuitive control. The thermostat comes pre-configured with weekly or 5+2 day programming options, allowing up to 6 independent time and temperature periods per day for enhanced comfort and energy efficiency.
The wireless design provides flexibility in placement, and the included receiver box is compatible with various boiler types, including on/off and OpenTherm systems, with integrated Wi-Fi for remote access.

This manual provides detailed instructions for the installation, operation, and maintenance of your T6R thermostat, ensuring you can maximize its features for optimal home comfort and energy savings.
2. Setup and Installation
The Honeywell Home T6R thermostat is designed for quick and simple installation. Before beginning, ensure you have read all instructions and safety warnings.
2.1 Compatibility
- The T6R is compatible with most water heating systems, including basic and combi boilers (gas or oil).
- The receiver box supports On/Off boilers and features OpenTherm functionality for modulating boilers. Consult your boiler manufacturer for specific compatibility details if using modulating functions.
2.2 Wi-Fi Requirement
- While the thermostat functions without Wi-Fi for basic operation and programming, an internet connection is necessary for remote control via the Honeywell Home app.
- The T6R operates on 2.4 GHz Wi-Fi networks and uses a proprietary 868 MHz communication protocol to avoid interference with other wireless devices.
2.3 Installation Steps
- Remove Power: Always disconnect the main power supply to your heating system before starting any electrical work. Remove any existing thermostat and its receiver box.
- Install Receiver Box: Choose a location near your boiler for the receiver box. Mount it securely using appropriate wall fixings. Connect the power supply and the boiler wiring to the receiver box as per the wiring diagram.
- Position T6R Thermostat: The T6R is wireless and does not require wall mounting. Place the thermostat on a flat, horizontal surface in your preferred room. Avoid locations exposed to drafts, direct sunlight, or near heat sources. Plug the thermostat into a power outlet for operation.
- Restore Power: Once all connections are secure, restore power to your heating system.
- Configuration: The T6R offers a guided setup process accessible directly from the thermostat or via the Honeywell Home app. Follow the on-screen instructions to connect to your Wi-Fi network and configure your heating preferences.


3. Operating Instructions
The T6R thermostat provides intuitive control through its large, backlit touchscreen display and the Honeywell Home mobile application.
3.1 Touchscreen Interface
- Program and adjust temperatures directly on the thermostat's screen.
- The display is continuously backlit, offering clear visibility day and night, with adjustable brightness.
3.2 Programming Schedules
- Set up personalized heating schedules with options for 7-day, daily, or 5+2 day programming.
- You can define up to 6 independent time and temperature periods each day to match your lifestyle.
3.3 Honeywell Home App Control
- Download the Honeywell Home app (available on App Store and Google Play) to control your thermostat remotely from your smartphone or tablet.
- The app allows you to adjust schedules, change setpoints, manage overrides, and receive real-time alerts.
3.4 Geofencing
Utilize the innovative geofencing technology to automatically adjust your heating based on your location. The thermostat detects when you leave and return home, optimizing energy savings and ensuring your home is at the desired temperature upon your arrival.

3.5 Smart Features
- Optimal Start/Stop: This feature learns how long it takes to heat your home, ensuring the desired temperature is reached precisely when scheduled, without wasting energy.
- Time Proportional & Integral (TPI) Controls: TPI controls efficiently manage boiler operation by cycling it on and off to maintain the desired temperature with minimal energy consumption.
- Frost Protection: The thermostat includes a frost protection function to prevent pipes from freezing during periods of low temperature.

4. Maintenance
To ensure optimal performance and longevity of your Honeywell Lyric T6R thermostat, follow these maintenance guidelines:
- Cleaning: Gently wipe the touchscreen and exterior surfaces with a soft, dry, or slightly damp cloth. Avoid using abrasive cleaners, solvents, or chemical sprays, as these can damage the display and casing.
- Software Updates: Ensure your thermostat's firmware is up to date. The Honeywell Home app will typically notify you of available updates, which can be installed wirelessly to enhance features and performance.
- Power Supply: Ensure the thermostat remains connected to its power supply. Although wireless, the T6R requires continuous power for operation.
5. Troubleshooting
If you encounter issues with your Honeywell Lyric T6R thermostat, refer to the following common troubleshooting steps:
5.1 Common Issues and Solutions
- No Power/Display Off:
- Check that the thermostat is correctly plugged into a working power outlet.
- Verify that the main power supply to your heating system is on.
- No Heating/Cooling:
- Ensure the thermostat is set to the correct mode (Heat/Cool) and the desired temperature is above/below the current room temperature.
- Check the receiver box for any indicator lights that might signal an issue with the boiler connection or power.
- Confirm that the boiler itself is operational.
- Wi-Fi Connection Issues:
- Ensure your home Wi-Fi network is active and broadcasting on 2.4 GHz.
- During initial setup or reconnection, try temporarily disabling mobile data on your smartphone to ensure it connects directly to the thermostat's setup network.
- Restart your Wi-Fi router and the thermostat.
- Ensure the thermostat is within range of your Wi-Fi router.
- Inaccurate Temperature Readings:
- Verify the thermostat is not placed near heat sources (e.g., direct sunlight, lamps, appliances) or in drafty areas, which can affect readings.
- Display Malfunction:
- If the display is unresponsive or showing errors, try restarting the thermostat by unplugging it and plugging it back in after a few seconds.
- If the issue persists, contact customer support.
For more detailed troubleshooting or persistent issues, consult the Honeywell Home app's help section or the official Honeywell Home support website.
6. Specifications
| Feature | Specification |
|---|---|
| Model | Y6R910RW8021 |
| Brand | Honeywell Home |
| Dimensions (Thermostat) | 10.3P x 6.8l x 10.3H centimeters (approx. 103 x 103 mm) |
| Product Dimensions (Overall) | 17.5 x 17.2 x 17 cm; 200 grams |
| Color | Black |
| Style | Wireless Black |
| Material | Thermostat |
| Power Type | AC DC |
| Voltage | 5 Volts |
| Display Type | Touchscreen |
| Special Features | Backlit, Programmable |
| Connectivity Technology | Wi-Fi |
| Controller Type | Touch, Voice (via smart home integration) |
| Specific Uses | Temperature control for heating systems |
| Components Included | 1 Wireless Thermostat, 1 Receiver Box, 1 User Manual |
| Country of Origin | United Kingdom |
7. Warranty and Support
For warranty information, please refer to the documentation included with your product or visit the official Honeywell Home website.
For technical support, product registration, or to access additional resources, please visit the Honeywell Home support portal or contact their customer service department. Online resources often include FAQs, troubleshooting guides, and contact information for direct assistance.





