RT520 Series Boiler Plus Compliant Thermostat | 5. Features And Functions | Help Center

5.1. Low Battery Warning & Changing Batteries
5.2. Setting Time & Date
5.3. Manual Mode
5.4. Changing the Language
5.5. Holiday Mode
5.6. Automatic Schedule Mode
5.7. Boost Mode
5.8. OpenTherm Settings
5.9. Temporary Override
5.10. Temperature Offset
5.11. Temperature Display Increments
5.12. Landlord Settings
5.13. Heating & Cooling Modes
5.14. Optimum Start & Stop
5.15. Span & TPI Control Algorithms
5.16. Factory Reset