Honeywell’s RTH2300 series offers reliable, easy-to-use climate control with a backlit display and programmable features. This thermostat provides years of dependable service.
Overview of the RTH2300 Series
The Honeywell RTH2300/RTH221 series is a programmable thermostat designed for straightforward operation and energy efficiency. It features a user-friendly interface with push-button controls, allowing for easy adjustments to your home’s temperature.
This series includes models with backlit displays, clearly showing the ambient temperature and setpoint. Pre-set program settings simplify initial setup, while temporary and permanent override options offer flexible control. It’s built for reliable performance and ease of installation.
Key Features and Benefits
The RTH2300 boasts several key features, including a backlit display for easy viewing and one-touch access to temperature settings. Honeywell’s pre-set program settings streamline setup, while override functions provide scheduling flexibility.
Benefits include improved energy efficiency through programmable schedules, convenient control over your home’s climate, and a user-friendly design. The thermostat also offers features like a filter change reminder and low battery indication for optimal performance.

Getting Started: Installation and Setup
Proper installation ensures optimal performance. Refer to the included manual for detailed instructions on mounting, powering on, and configuring your new Honeywell RTH2300 thermostat.
Package Contents
Upon opening the Honeywell RTH2300 package, carefully verify all components are present. You should find the RTH2300 programmable thermostat unit itself, a mounting baseplate for wall attachment, and installation screws for secure placement.
Additionally, the package includes detailed operating instructions – the user manual – providing step-by-step guidance. Ensure you locate this manual for proper setup and troubleshooting. Batteries may or may not be included, so have AA batteries ready if needed for initial operation.
Mounting the Thermostat
Begin by turning off power to your heating and cooling system at the breaker. Remove your old thermostat, carefully disconnecting the wires and labeling each one. Attach the RTH2300 mounting baseplate to the wall using the provided screws, ensuring it’s level.
Connect the labeled wires to the corresponding terminals on the baseplate. Finally, gently snap the RTH2300 thermostat unit onto the mounted baseplate until it clicks securely into place. Restore power to the system.
Powering On and Initial Configuration
Once power is restored, the RTH2300 will power on and initiate the setup process. The display will prompt you to set the date and time. Use the up and down arrow buttons to adjust these settings, confirming each selection.
Next, the thermostat may ask about your heating and cooling system type – select the appropriate option. Finally, review the pre-set program settings or choose to customize a schedule to fit your lifestyle.

Understanding the Display
The RTH2300 features a backlit display showing ambient temperature, setpoint, and mode indicators (Heat, Cool, Off). Icons signal important status updates.
Display Icons and Indicators
The Honeywell RTH2300 display utilizes several icons to communicate thermostat status. A flashing Lo Batt indicates low batteries requiring immediate replacement. The display continuously shows the measured ambient temperature. Mode indicators clearly display whether the system is in Heat, Cool, or Off mode.
Additionally, the thermostat may display icons related to specific features or system conditions, such as a filter change reminder. Understanding these indicators ensures optimal performance and efficient operation of your heating and cooling system. Refer to the manual for detailed explanations of all icons;
Temperature Display
The RTH2300 prominently displays the ambient, or measured, room temperature at all times. This allows for quick and easy monitoring of your home’s climate. The thermostat shows the current temperature in a large, clear format for easy readability.
Users can easily access and adjust the setpoint temperature using dedicated buttons. The display will then show both the current temperature and the desired setpoint, ensuring comfortable and efficient climate control.
Mode Indicators (Heat, Cool, Off)
The RTH2300 thermostat utilizes clear indicators to display the currently selected operating mode. Distinct icons illuminate to show whether the system is in Heat mode, actively warming your home, or Cool mode, providing cooling.
When the thermostat is set to Off, neither heating nor cooling will engage. These mode indicators provide a quick visual confirmation of the system’s status, ensuring convenient and intuitive operation for users.

Programming the Thermostat
The RTH2300 allows customized temperature schedules for weekdays and weekends, offering convenience and energy savings. Pre-set program settings are also available.
Setting the Date and Time
Proper date and time settings are crucial for accurate scheduling. To set these, access the thermostat’s programming mode, typically through the ‘Menu’ or ‘Set’ button. Navigate to the date setting, using the up and down arrows to adjust the month, day, and year.
Confirm each selection before proceeding. Repeat this process for the time, adjusting the hour and minute. Ensure AM or PM is correctly indicated. Accurate timekeeping ensures your programmed schedules function as intended, maximizing comfort and energy efficiency.
Weekday/Weekend Scheduling
The RTH2300 allows distinct temperature programs for weekdays and weekends, accommodating different routines. Access the programming mode and select either “Weekday” or “Weekend” schedule. You can then set multiple periods per day – such as ‘Wake’, ‘Leave’, ‘Return’, and ‘Sleep’ – each with a desired temperature.
Consider utilizing the pre-set program settings as a starting point, tailoring them to your specific needs. This flexibility optimizes comfort while minimizing energy consumption based on your lifestyle.
Pre-set Program Settings
The RTH2300 thermostat includes convenient pre-set program settings designed for typical weekday and weekend schedules; These settings offer a comfortable balance between energy savings and home climate control. The table within the manual details these pre-programmed temperature settings for each period – Wake, Leave, Return, and Sleep.
We recommend starting with these pre-sets and then customizing them to perfectly match your personal preferences and daily routines for optimal efficiency.
Adjusting Temperature Settings
The RTH2300 allows for temporary and permanent overrides of the programmed schedule, plus easy adjustment of the setpoint temperature using push-button controls.
Temporary Override
To temporarily adjust the temperature, use the up or down buttons to set your desired setpoint. This override will maintain the new temperature until the next programmed schedule change. The thermostat will automatically revert back to its regularly scheduled program at the pre-set time. This feature provides convenient, short-term temperature adjustments without altering your long-term settings; It’s a simple way to quickly respond to changing comfort needs, ensuring efficient energy use and personalized climate control.
Permanent Override
A permanent override allows you to change the setpoint temperature, and this new setting will remain in effect indefinitely, ignoring the programmed schedule. To activate, adjust the temperature using the up or down buttons. The thermostat will hold this temperature until you manually revert back to the programmed schedule. This is ideal for extended periods requiring a consistent temperature, offering continuous comfort and control.
Setpoint Temperature Adjustment
The RTH2300 allows simple setpoint adjustments using the up and down buttons on the thermostat face. These buttons directly modify the desired temperature, displayed prominently on the backlit screen. One-touch access provides quick changes, ensuring comfortable climate control. Adjustments impact either the temporary or permanent override, depending on how the thermostat is configured for your needs.
Operating Modes
The RTH2300 supports Heat, Cool, and Off modes, allowing versatile climate control. Selecting a mode dictates how the thermostat manages your home’s temperature.
Heat Mode
In Heat mode, the thermostat activates your heating system when the room temperature falls below the setpoint. The system operates until the desired temperature is reached, then cycles off. Ensure your system is configured correctly for heat – especially if you have a heat pump. The display will clearly indicate when the heating system is actively running, providing visual confirmation of operation. Adjust the setpoint to achieve your preferred comfort level during colder periods.
Cool Mode
When in Cool mode, the thermostat activates your cooling system when the room temperature rises above the setpoint. The system will run until the desired temperature is achieved, then cycle off; Verify proper configuration for cooling, particularly with heat pumps; The display shows active cooling. Adjust the setpoint for optimal comfort during warmer weather, ensuring efficient energy use and a pleasant indoor climate.
Off Mode
Selecting Off mode completely disables both the heating and cooling systems. The thermostat will display the current room temperature, but will not attempt to maintain a setpoint. This mode is useful when you want no climate control, such as during extended absences or when windows are open for ventilation. Remember to switch back to Heat or Cool for automated temperature regulation.

Advanced Features
The RTH2300 includes a filter change reminder, a low battery indicator (“Lo Batt”), and is compatible with heat pump systems for versatile control.
Filter Change Reminder
Honeywell thoughtfully included a filter change reminder feature within the RTH2300 thermostat. This helpful function prompts you to replace your air filter, ensuring optimal system performance and air quality. The thermostat doesn’t explicitly state how it reminds you – likely through a displayed icon or message.
Regular filter changes are crucial for maintaining efficient heating and cooling, reducing energy costs, and prolonging the life of your HVAC equipment. Consult your filter’s packaging for recommended replacement intervals.
Low Battery Indicator (Lo Batt)
The RTH2300 thermostat is equipped with a “Lo Batt” indicator to alert you when the batteries are running low. When the batteries are nearing depletion, “Lo Batt” will flash on the display screen, signaling the need for a battery replacement.
Prompt battery replacement is essential to maintain continuous thermostat operation and accurate temperature control. Ignoring this warning could lead to system malfunction or inaccurate readings, impacting comfort and energy efficiency.
Heat Pump Compatibility
The Honeywell RTH2300 thermostat is designed to work with most standard heating and cooling systems, including heat pumps; However, proper configuration is crucial for optimal performance. During installation, ensure the thermostat is correctly set to recognize a heat pump system.
Incorrect settings can lead to inefficient operation or prevent the heat pump from functioning correctly. Refer to the installation guide for specific heat pump configuration instructions.
Troubleshooting Common Issues
Most problems with the RTH2300 can be corrected quickly and easily by the user. Consult this section for solutions to frequent issues encountered.
Thermostat Not Responding
If your Honeywell RTH2300 thermostat isn’t responding, first check the battery level. A flashing “Lo Batt” indicator signals low batteries, requiring immediate replacement. Ensure the thermostat is securely mounted and properly powered.
Verify the circuit breaker controlling the HVAC system hasn’t tripped. If the issue persists, attempt a factory reset, carefully following the outlined procedure. Contact Honeywell Customer Care for further assistance if these steps don’t resolve the problem.
Incorrect Temperature Readings
If the RTH2300 displays inaccurate temperatures, ensure it isn’t exposed to direct sunlight, drafts, or heat sources. These external factors can significantly impact readings. Verify the thermostat is mounted on an interior wall, away from windows and vents.
Allow sufficient time for the thermostat to adjust after initial installation or battery replacement. If discrepancies continue, consider recalibrating the temperature settings or contacting Honeywell support for guidance.
Communication Errors
If your RTH2300 experiences communication issues, first check the wiring connections between the thermostat and your heating/cooling system. Ensure all wires are securely fastened to their respective terminals. Power cycle both the thermostat and the HVAC system by turning them off and on.
If problems persist, consult a qualified HVAC technician to diagnose potential compatibility issues or wiring faults. A professional assessment is crucial for resolving complex communication errors.

Battery Replacement
The RTH2300 requires battery replacement when “Lo Batt” flashes on the display. Use fresh alkaline batteries for optimal performance and continued operation.
Battery Type Required
Honeywell RTH2300 thermostats utilize two AA alkaline batteries to maintain operation during power outages and as the primary power source if desired. It is crucial to use fresh, high-quality alkaline batteries for reliable performance. Avoid using heavy-duty, rechargeable, or lithium batteries, as they may damage the thermostat or reduce its lifespan. Ensure proper battery polarity when installing new batteries, referencing the markings inside the battery compartment.
Battery Replacement Procedure
To replace the batteries, locate the battery compartment, typically on the side or back of the thermostat. Gently open the compartment cover. Remove the old batteries and install two fresh AA alkaline batteries, ensuring correct polarity (+ and -) as indicated inside; Close the battery compartment cover securely. A “Lo Batt” indicator will disappear upon successful battery replacement.

Warranty Information
Honeywell warrants this product, excluding the battery, against defects in materials and workmanship for one year from the consumer purchase date.
One-Year Limited Warranty Details
Honeywell provides a one-year limited warranty covering defects in workmanship or materials under normal use and service, starting from the original consumer purchase date. This warranty excludes battery issues and doesn’t cover problems resulting from improper installation, misuse, abuse, or unauthorized modifications.
To obtain warranty service, contact Honeywell Customer Care with proof of purchase. This warranty offers repair or replacement, at Honeywell’s option, and does not cover incidental or consequential damages.
Contacting Honeywell Customer Care
For assistance with your Honeywell RTH2300 thermostat, visit the Honeywell Home website at http://yourhome.honeywell.com. You can find helpful resources, FAQs, and troubleshooting guides online. Alternatively, you can contact Honeywell Customer Care directly by calling their toll-free number: 1-800-468-1502.
Please have your model number and date of purchase readily available when contacting customer care to expedite the support process.

Technical Specifications
The RTH2300 boasts a maximum current rating and operates within a specific temperature range, powered by batteries for convenient, reliable performance.
Maximum Current Rating
Understanding the maximum current rating is crucial for ensuring compatibility with your heating and cooling system. The Honeywell RTH2300 thermostat is designed to handle specific electrical loads. Exceeding this rating can damage the thermostat or the connected HVAC equipment.
While the exact amperage varies depending on the specific model within the RTH2300 series, it’s essential to consult the detailed specifications in your user manual. Generally, it supports standard 24VAC systems. Always verify the current requirements of your system before installation to avoid potential issues.
Temperature Range
The Honeywell RTH2300 thermostat is engineered to operate effectively within a defined temperature range, ensuring accurate readings and reliable performance. Typically, this thermostat can measure ambient temperatures spanning from approximately 32°F to 90°F (0°C to 32°C).
However, it’s vital to consult your specific model’s documentation for precise limits. Operating outside this range may lead to inaccurate temperature displays or compromised system control. Maintaining a suitable environment guarantees optimal thermostat functionality.
Power Source
The Honeywell RTH2300 thermostat primarily relies on battery power for its operation, typically utilizing two AA alkaline batteries. While some models may be compatible with a “C” wire for continuous power, battery operation is standard.
A low battery indicator (“Lo Batt”) will appear on the display, signaling the need for replacement. Using fresh, high-quality batteries ensures consistent and accurate performance. Battery life varies based on usage and settings.
Accessing Support and Resources
Honeywell Home provides extensive online support, including manuals, FAQs, and troubleshooting guides at http://yourhome.honeywell.com. Customer Care is also available toll-free.
Honeywell Home Website
Honeywell Home’s website (http://yourhome.honeywell.com) serves as a central hub for RTH2300 support. Users can download the complete operating manual in PDF format, offering detailed instructions and diagrams.
The site also features a comprehensive FAQ section addressing common questions and troubleshooting steps. Additionally, you’ll find helpful articles and videos demonstrating thermostat features and programming techniques. Registration options are available for enhanced support and product updates, ensuring you have access to the latest information.
Online Manuals and FAQs
Numerous online resources provide the Honeywell RTH2300 operating manual. Websites like ManualsLib and Honeywell Home host downloadable PDF versions for easy access. These manuals detail installation, programming, and troubleshooting.
Extensive FAQs address common issues like incorrect temperature readings or communication errors. Online forums and support communities offer user-shared solutions and advice. These resources empower users to resolve problems independently and maximize their thermostat’s functionality.

Safety Precautions
Always follow general electrical safety guidelines during installation. Disconnect power before wiring, and consult a qualified technician if unsure about any procedures.
General Safety Guidelines
Before installing or servicing your Honeywell RTH2300 thermostat, carefully read and save all provided instructions. Ensure the unit is installed by a qualified individual familiar with HVAC systems. Avoid exposing the thermostat to extreme temperatures or humidity, as this can affect its performance. Regularly check wiring connections for tightness and proper insulation.
Do not attempt to disassemble or repair the thermostat yourself; contact Honeywell Customer Care for assistance. Keep the thermostat and its packaging out of reach of children. Always prioritize safety when working with electrical components;
Electrical Safety
Always disconnect power at the breaker or fuse box before installing or removing the RTH2300 thermostat to prevent electrical shock. If you are uncomfortable working with electrical wiring, consult a qualified technician. Ensure all wiring connections adhere to local electrical codes and regulations.
Never expose the thermostat to water or other liquids. Do not operate the thermostat with damaged wiring or components. If you suspect an electrical issue, immediately turn off the power and seek professional help.

Resetting the Thermostat
To reset, a factory reset clears programmed schedules, returning the RTH2300 to its original settings. Consult the manual for specific reset procedures.
Factory Reset Procedure
Performing a factory reset on your Honeywell RTH2300 thermostat will erase all personalized settings, including programmed schedules, temperature overrides, and date/time configurations. This returns the thermostat to its original, out-of-the-box state. While the specific steps aren’t explicitly detailed in readily available summaries, consulting the full operating manual is crucial.
Generally, this involves navigating through the thermostat’s menu system, often accessed by pressing and holding specific button combinations. Be aware that a factory reset requires re-programming the thermostat entirely after completion.
Clearing Programmed Schedules
To remove existing programmed schedules on your Honeywell RTH2300 thermostat, access the programming mode through the thermostat’s menu. Navigate to the schedule settings, where you can typically delete individual programs or clear all schedules at once. The exact method varies, so referencing the complete operating manual is recommended.
Clearing schedules reverts the thermostat to a hold mode, maintaining a constant temperature until a new program is established. This is useful for temporary temperature control or when a new schedule is desired.
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