Honeywell TH6110D1005/U Thermostat: A Comprehensive Guide
This guide details the Honeywell TH6110D1005/U, offering insights into its features, installation, operation, and troubleshooting, based on available manuals and resources.
The Honeywell TH6110D1005/U is a popular programmable thermostat designed for residential heating and cooling systems. It provides users with precise temperature control and energy-saving capabilities. This thermostat features a simple, pull-out instruction manual for easy reference, making initial setup and operation straightforward. Key benefits include adaptive intelligent recovery, ensuring programmed temperatures are met on schedule, and temperature range limits to prevent extreme settings.
Designed for compatibility with various systems, the TH6110D1005/U offers both automatic and manual changeover options, configurable through the installer setup (Function 12). It aims to deliver comfort and efficiency, potentially saving up to 33% on energy costs through programmable schedules. Understanding its features and functions is crucial for optimal performance and maximizing energy savings within your home environment.
Key Features and Benefits

The Honeywell TH6110D1005/U boasts several key features enhancing user experience and energy management. Adaptive intelligent recovery is a standout, proactively adjusting heating or cooling to reach set temperatures precisely when programmed. Temperature range limits prevent excessively high or low settings, promoting system longevity and comfort. Programmable schedules allow for customized temperature control, potentially yielding up to 33% in energy savings.
Furthermore, the thermostat offers both manual and automatic changeover options, configurable via Function 12 in the installer setup. Its intuitive design, coupled with the included simple instruction manual, ensures ease of use. Compressor protection timeout safeguards the system, preventing damage during operation. These features combine to deliver a reliable, efficient, and user-friendly thermostat solution.

Installation and Setup
Proper installation involves careful wiring, secure base mounting, and initial configuration to ensure optimal performance of the Honeywell TH6110D1005/U thermostat.
Wiring Diagram and Connections
Understanding the wiring is crucial for a successful installation. The Honeywell TH6110D1005/U typically utilizes a standard 5-2 wire configuration, though variations exist depending on your existing system. Common terminals include Rh and Rc (power), W (heat), Y (cool), G (fan), and C (common – often required for consistent power).
Always disconnect power at the breaker before beginning any wiring. Carefully label existing wires before disconnecting them from the old thermostat. Incorrect wiring can damage the thermostat or your HVAC system. Refer to the detailed wiring diagram in the official Honeywell manual (PDF available online) for precise connections specific to your setup. Double-check all connections before restoring power.
Mounting the Thermostat Base
After wiring, securely mount the thermostat base to the wall. Ensure the location is level and away from direct sunlight, drafts, or heat sources that could affect temperature readings. Use the provided screws and wall anchors if necessary, ensuring they are appropriate for your wall type;
Carefully align the base and mark the screw holes. Drill pilot holes if needed, then insert the anchors and screws. Gently push the wires back into the wall, avoiding any pinching or strain; Snap the thermostat base firmly onto the mounting plate, verifying it’s securely attached before proceeding.
Initial Power-Up and Configuration
Upon powering up, the Honeywell TH6110D1005/U thermostat will initiate a self-test. The display should illuminate, and you may be prompted to enter initial settings like date and time. Follow the on-screen instructions carefully, using the buttons to navigate and adjust values.
Verify the system type (heat, cool, or heat pump) is correctly configured. The thermostat may also ask about fuel type. Accurate configuration is crucial for proper operation. If errors occur, consult the manual or Honeywell support.

Operating the Thermostat
The TH6110D1005/U offers intuitive control via its display and buttons, allowing users to easily manage heating and cooling settings for optimal comfort.
Understanding the Display Icons
The Honeywell TH6110D1005/U thermostat utilizes a variety of display icons to communicate system status and operational mode. A flame icon indicates the heating system is actively engaged, providing warmth. Conversely, a snowflake icon signifies the cooling system is running, delivering chilled air.
The fan icon displays the fan’s operational status – on, auto, or off. A battery icon alerts users to low battery levels, prompting replacement. When “Pr” appears, it signals compressor protection timeout is engaged, requiring a five-minute wait before restarting.
Other icons may indicate system mode (Heat, Cool, Auto, Off), schedule programming, or temporary hold activation. Familiarizing yourself with these icons ensures efficient thermostat operation and quick identification of potential issues. Refer to the full manual for a complete icon glossary.
Setting the System Mode (Heat, Cool, Auto, Off)
The Honeywell TH6110D1005/U offers four primary system modes: Heat, Cool, Auto, and Off. Selecting “Heat” activates the heating system, maintaining the desired temperature. “Cool” engages the cooling system for temperature reduction. “Auto” intelligently switches between heating and cooling to maintain the setpoint, optimizing comfort and energy efficiency.
The “Off” mode disables both heating and cooling, allowing for manual fan control if desired. To change modes, navigate through the thermostat’s menu using the up and down arrow buttons. Confirm your selection by pressing the “OK” or “Select” button.
Ensure the chosen mode aligns with your current needs and seasonal conditions for optimal performance. Refer to the manual for detailed instructions on mode selection and customization.
Adjusting the Temperature
The Honeywell TH6110D1005/U allows for precise temperature adjustments to maintain optimal comfort. Utilize the up and down arrow buttons on the thermostat’s interface to increase or decrease the setpoint temperature. The current set temperature is prominently displayed on the screen for easy reference.
Temperature adjustments can be made in one-degree increments, providing granular control. Consider utilizing the temperature range limits feature to prevent excessively high or low settings, promoting energy savings and system longevity.
Remember to allow sufficient time for the system to respond to temperature changes. Refer to the user manual for specific details regarding temperature adjustment ranges and system response times.

Programming the Thermostat
The TH6110D1005/U enables customized schedules for energy savings, featuring weekday/weekend settings, temporary holds, overrides, and smart recovery functions.
Setting Up a Schedule (Weekday/Weekend)
The Honeywell TH6110D1005/U thermostat allows for distinct programming schedules tailored to weekdays and weekends, maximizing comfort and energy efficiency. To begin, access the programming mode through the thermostat’s menu. You can then define different temperature settings for various time periods throughout the day – typically wake, leave, return, and sleep.
Each period can be assigned a specific temperature for both heating and cooling. Remember to differentiate between weekday and weekend schedules to accommodate varying routines. The thermostat’s intuitive interface guides you through setting the start time and desired temperature for each period. Utilizing this feature effectively can lead to significant energy savings, as the system automatically adjusts to your lifestyle.
Temporary Holds and Overrides
The Honeywell TH6110D1005/U offers convenient temporary hold and override functions for immediate temperature adjustments without disrupting your programmed schedule. A temporary hold allows you to set a desired temperature for a specified duration, after which the thermostat automatically reverts to the scheduled program. This is ideal for short-term comfort needs.
An override function provides a more permanent adjustment, maintaining the new temperature until manually changed. Both options are easily accessible through the thermostat’s interface. Utilizing these features provides flexibility and control, ensuring optimal comfort when unexpected events or preferences arise. Remember to consider the impact on energy consumption when employing these overrides.
Using the Smart Recovery Feature
The Honeywell TH6110D1005/U incorporates a Smart Recovery feature, also known as adaptive intelligent recovery, designed to optimize comfort and energy efficiency. This intelligent function learns your heating and cooling system’s characteristics to ensure your programmed temperature is reached precisely when scheduled.
Instead of simply turning on the system at the scheduled time, Smart Recovery calculates the necessary start time, factoring in room temperature and system response. This proactive approach minimizes wasted energy while maximizing comfort. The feature is typically enabled by default, but its functionality can be adjusted within the thermostat’s settings for personalized performance.

Troubleshooting Common Issues
This section addresses frequent problems with the TH6110D1005/U, including compressor timeout errors, display malfunctions, and potential connectivity issues if applicable.
Compressor Protection Timeout Errors
Encountering a compressor protection timeout error with your Honeywell TH6110D1005/U thermostat indicates the system has temporarily shut down to prevent damage to the compressor. This safety feature activates when the compressor runs for an extended period without achieving the desired temperature change.
To resolve this, allow at least five minutes for the system to automatically restart. Avoid repeatedly adjusting the thermostat during this period, as it can prolong the timeout. Ensure air filters are clean, and vents are unobstructed to facilitate proper airflow. If the error persists, verify the system setting is appropriately configured – either Manual or Auto Changeover (Function 12).
Persistent timeout errors may signal a more significant issue, such as a refrigerant leak, a failing compressor, or restricted airflow within the HVAC system, requiring professional diagnosis and repair.
Display Issues and Solutions

If your Honeywell TH6110D1005/U thermostat display is blank or exhibiting unusual behavior, several troubleshooting steps can be taken. First, ensure the thermostat receives adequate power; check the circuit breaker and wiring connections. A simple reset can often resolve minor glitches – try removing the thermostat from its base for a few minutes, then reattaching it.
If the display is dim or flickering, verify the backlight settings (if applicable) and consider replacing the batteries if the thermostat utilizes them as a backup power source. For distorted characters or incomplete displays, a more significant internal issue might be present.
Consult the built-in, pull-out instruction manual for specific error codes or diagnostic information. If problems persist, contact Honeywell support for further assistance.
Connectivity Problems (if applicable)
The Honeywell TH6110D1005/U is a non-connected thermostat; therefore, direct connectivity issues like Wi-Fi or Bluetooth problems are not applicable. However, if paired with a compatible Honeywell Home system or hub for remote access, troubleshooting becomes necessary when communication fails.
Ensure the hub is online and functioning correctly, verifying its internet connection. Check the signal strength between the thermostat and the hub, minimizing interference from other devices. If the thermostat appears offline within the Honeywell Home app, attempt a device reset or re-pairing process.
Refer to the Honeywell Home system documentation for specific troubleshooting steps related to hub connectivity and device integration. Contact Honeywell support if issues persist.

Advanced Settings and Features

Explore Function 12 for manual or auto changeover, alongside temperature range limits, offering customized control and optimizing energy efficiency within the thermostat.
Change Installer Setup (Function 12)
Function 12 within the installer setup allows modification of the system setting, specifically controlling the changeover between heating and cooling modes. Users can select either “Manual” or “Auto” changeover. Selecting “Manual” requires the user to manually switch between Heat and Cool modes as needed, providing direct control.
Conversely, choosing “Auto” changeover enables the thermostat to automatically switch between heating and cooling based on the set temperature and the current room temperature. This feature simplifies operation and maintains a consistent comfort level. To access Function 12, consult the full installation manual for specific button sequences. Proper configuration ensures optimal system performance and user convenience, tailoring the thermostat to individual preferences and climate conditions.
Temperature Range Limits
The Honeywell TH6110D1005/U thermostat incorporates temperature range limits as a crucial safety and energy-saving feature. These limits prevent users from setting temperatures excessively high or low, potentially causing system strain or discomfort. The thermostat’s programming allows installers to define minimum and maximum heating and cooling temperature setpoints.
This functionality safeguards the heating and cooling equipment from damage due to extreme operation. It also contributes to energy conservation by preventing wasteful overheating or overcooling. Adjusting these limits requires access to the installer setup menu, detailed in the comprehensive manual. Properly configured temperature ranges ensure efficient and reliable operation, protecting both the system and the user’s comfort.

Resources and Support
Access the TH6110D1005/U manual in PDF format online for detailed instructions, or contact Honeywell support for assistance with your thermostat.
Downloading the TH6110D1005/U Manual (PDF)
Obtaining the official Honeywell TH6110D1005/U thermostat manual in PDF format is crucial for comprehensive understanding and successful operation. This document provides detailed instructions covering installation, wiring, programming, troubleshooting, and advanced settings. The built-in instructions are simple, utilizing a pull-out manual for quick reference.
You can typically find the PDF manual through a quick online search using keywords like “Honeywell TH6110D1005/U manual PDF.” Several websites archive these documents, offering free downloads. Ensure the source is reputable to avoid potentially corrupted or outdated files. The manual details features like adaptive intelligent recovery, temperature range limits, and potential energy savings of up to 33% with proper programming. Having this resource readily available will empower you to maximize your thermostat’s functionality and address any issues that may arise.
Honeywell Support Contact Information
For direct assistance with your Honeywell TH6110D1005/U thermostat, Honeywell provides multiple support channels. While specific contact details may evolve, their official website is the primary resource for up-to-date information. You can often find a comprehensive FAQ section addressing common issues and troubleshooting steps related to the thermostat’s operation and programming.
Direct phone support is generally available through Honeywell’s customer service line, though wait times may vary. Their website also typically offers options for online chat with a support representative. When contacting support, having your thermostat model number (TH6110D1005/U) readily available will expedite the process. Referencing the manual, if possible, can also help clearly articulate your issue and receive targeted assistance.