honeywell th5220d1003 manual
Honeywell TH5220D1003 Manual: A Comprehensive Guide
This manual provides detailed instructions for the Honeywell TH5220D1003 non-programmable digital thermostat, covering installation, operation, and troubleshooting.
It’s a crucial resource for homeowners and HVAC professionals alike, ensuring proper setup and efficient use of this widely-used thermostat model.

The Honeywell TH5220D1003 is a widely utilized, non-programmable digital thermostat designed for reliable and straightforward temperature control in residential settings. As a member of the FocusPRO series, it offers a user-friendly interface and dependable performance. This thermostat is a direct replacement for many existing thermostats, making upgrades simple and efficient.
This model is particularly favored for its ease of installation and operation, eliminating the complexities of programmable features for users who prefer a consistent temperature setting. The TH5220D1003 is compatible with a broad range of heating and cooling systems, including gas, oil, and electric. Understanding its features and proper installation procedures, detailed within this manual, will ensure optimal comfort and energy efficiency within your home. It’s a cost-effective solution for maintaining a comfortable indoor climate.
Key Features of the TH5220D1003 Model
The Honeywell TH5220D1003 boasts several key features that contribute to its popularity. Primarily, it’s a non-programmable thermostat, offering simple, consistent temperature control without the need for scheduling. The large, easy-to-read display clearly shows the current temperature and setpoint.
Its compatibility with various heating and cooling systems – gas, oil, and electric – makes it a versatile choice for many homes. The thermostat also includes a precise temperature control, ensuring consistent comfort. Importantly, it’s designed as a direct replacement for many existing thermostats, simplifying the installation process. Furthermore, the unit is built with reliable components, ensuring long-lasting performance. The FocusPRO series emphasizes user-friendliness and dependable operation, making this model an excellent choice for straightforward climate control.

Installation Procedures
Proper installation is vital for optimal performance. This section details safety precautions, required tools, wiring diagrams, and a step-by-step guide for a successful setup.
Safety Precautions Before Installation
Before beginning the installation process, prioritize safety to prevent electrical shock, fire hazards, or damage to the system. Always disconnect power to the heating and cooling system at the breaker box or fuse before removing the old thermostat or connecting any wires.
If replacing a thermostat containing mercury, do not dispose of it in the trash. Mercury is a hazardous material, and proper recycling is essential. Contact your local waste management authority for specific instructions on mercury disposal.
Ensure the installation area is dry and free from obstructions. Read and understand all instructions in this manual before proceeding. If you are uncomfortable with electrical wiring, consult a qualified HVAC technician for assistance. Failure to follow these precautions could result in serious injury or property damage.
Tools Required for Installation
Proper preparation is key to a smooth installation process. You will need a few essential tools to successfully install your Honeywell TH5220D1003 thermostat. A small screwdriver (both flathead and Phillips head) is crucial for removing and tightening screws on the thermostat and wiring connections.
A wire stripper/cutter will be necessary to safely strip the insulation from the thermostat wires without damaging the conductors. A level ensures the thermostat is mounted straight for accurate readings and a professional appearance.
A pencil is helpful for marking screw holes and wire locations. Optionally, a voltage tester can confirm power is off before handling wires, and a digital multimeter can assist with troubleshooting. Having these tools readily available will streamline the installation process.
Wiring Diagram Overview
Understanding the wiring diagram is paramount before commencing installation. The Honeywell TH5220D1003 typically utilizes a standard wiring configuration, but variations exist depending on your heating/cooling system. Common terminals include R (power), W (heat), Y (cool), G (fan), and C (common – often blue).
W2 is often used for second-stage heating. Carefully identify the corresponding wires from your existing thermostat and label them before disconnecting. The diagram illustrates how these wires connect to the TH5220D1003’s terminals.
Incorrect wiring can damage your system, so double-check all connections. For gas-fired unit heaters and duct furnaces (HD/HDB, HDS/HDC, etc.), specific wiring selections apply. Always refer to the detailed wiring diagram included with your thermostat or available online for accurate guidance.
Step-by-Step Installation Guide

Begin by turning off power to your HVAC system at the breaker. Remove the cover of your old thermostat and carefully disconnect the wires, labeling each one as you go. Use the provided wall label to mark the wire locations. Mount the Honeywell TH5220D1003 baseplate to the wall, ensuring it’s level.
Connect the wires to the corresponding terminals on the new thermostat baseplate, referencing the wiring diagram. Securely attach the thermostat to the baseplate. Restore power at the breaker. The thermostat should power on and initiate the setup process. Follow the on-screen prompts to configure your system type and preferences.
Verify proper operation by testing both heating and cooling modes.
Replacing an Existing Thermostat
Before replacing your thermostat, completely shut off power to your heating and cooling system at the circuit breaker to avoid electrical shock. Carefully remove the cover of the existing thermostat, exposing the wiring terminals. Crucially, label each wire with its corresponding terminal designation before disconnecting them – this is vital for correct re-installation.
Disconnect the wires and remove the old baseplate. Mount the Honeywell TH5220D1003 baseplate using the provided screws and wall anchors, ensuring it’s level. Connect the labeled wires to the appropriate terminals on the new baseplate, referencing the wiring diagram. Secure the thermostat to the baseplate and restore power at the breaker.
Test the system to confirm proper operation of both heating and cooling.
Mercury Disposal Information
If your old thermostat contains mercury in a sealed tube – a common feature in older models – it requires careful and responsible disposal. Do not discard it with regular household trash. Mercury is a hazardous material and poses environmental risks if improperly handled.
Contact your local waste management authority for specific instructions on recycling or proper disposal procedures in your area. Many communities have designated collection sites or events for hazardous waste. Some retailers also offer thermostat recycling programs.
Proper disposal protects the environment and public health. Ignoring these guidelines could lead to mercury contamination. Honeywell emphasizes responsible handling of older thermostats containing mercury, ensuring compliance with environmental regulations.

Operating Instructions
The Honeywell TH5220D1003 offers simple temperature control, system mode selection (heat, cool, off), and fan settings for comfortable home climate management.
Understanding the Display
The Honeywell TH5220D1003 thermostat features a clear, easy-to-read display providing essential information at a glance. The primary area showcases the current room temperature, prominently displayed in a large font. Adjacent to this, you’ll find the set temperature, indicating your desired heating or cooling point.
Below the temperature readings, the display indicates the current system mode – whether the system is in Heat, Cool, or Off mode. Small icons visually represent these modes for quick identification. Additionally, the display shows the fan setting, indicating if the fan is set to Auto or On.
During operation, the display may also briefly show messages or error codes, providing diagnostic information if issues arise. A battery icon will illuminate when the batteries are low, prompting replacement. Familiarizing yourself with these display elements will allow for efficient monitoring and control of your home’s comfort.
Setting the Temperature
Adjusting the temperature on your Honeywell TH5220D1003 thermostat is straightforward. Utilize the clearly marked Up and Down temperature control buttons located on the thermostat face. Pressing the Up button increases the set temperature, while the Down button decreases it.
Each press typically adjusts the temperature in one-degree increments, though this may vary. The display will update in real-time, showing the new set temperature as you make adjustments; The thermostat will then automatically activate your heating or cooling system to reach and maintain this desired temperature.
Remember that the thermostat responds to the set temperature, not the current room temperature. Allow sufficient time for the system to respond to changes, ensuring comfortable and efficient climate control. Avoid frequent, large temperature adjustments for optimal energy usage.
System Mode Selection (Heat, Cool, Off)
The Honeywell TH5220D1003 thermostat offers three primary system modes: Heat, Cool, and Off. Selecting the appropriate mode ensures your HVAC system operates as intended. The System button allows you to cycle through these options.
In Heat mode, the thermostat activates your heating system when the room temperature falls below the setpoint. Cool mode activates the cooling system when the temperature rises above the setpoint. The Off mode disables both heating and cooling, allowing for manual control or system shutdown.
Ensure the correct mode is selected based on the season and your comfort preferences. The currently selected mode is typically indicated on the thermostat display. Proper mode selection is crucial for efficient operation and maintaining a comfortable indoor environment.
Fan Control Settings
The Honeywell TH5220D1003 thermostat provides options for controlling the fan operation, influencing both air circulation and system efficiency. You can typically select between Auto and On settings using the fan control button.
In Auto mode, the fan operates only during heating or cooling cycles, circulating air when the system is actively working to adjust the temperature. Selecting On forces the fan to run continuously, regardless of whether heating or cooling is engaged.
Continuous fan operation can improve air circulation and even out temperature distribution, but it also consumes more energy. Consider your comfort needs and energy-saving goals when choosing a fan control setting. The current fan setting is usually displayed on the thermostat’s screen.

Troubleshooting Common Issues
This section details solutions for typical problems, such as the thermostat not powering on, inaccurate temperature readings, or a system unresponsive to settings.
Thermostat Not Powering On
If your Honeywell TH5220D1003 thermostat fails to power on, begin by verifying the power source. Check the circuit breaker or fuse box to ensure the thermostat’s circuit hasn’t tripped or blown. Confirm that the thermostat wires are securely connected to the correct terminals – a loose connection can interrupt power.
Inspect the batteries, if your model utilizes them, and replace them with fresh ones. Ensure the thermostat is properly seated on the wall plate; a poor connection here can also prevent power-up. If replacing a previous thermostat, double-check that the ‘C’ wire (common wire) is connected, as this is often required for consistent power.
If the issue persists, consult a qualified HVAC technician to diagnose potential wiring problems or a faulty thermostat unit. Do not attempt repairs if you are uncomfortable working with electrical wiring.

Incorrect Temperature Readings
If the Honeywell TH5220D1003 displays inaccurate temperature readings, several factors could be at play. Ensure the thermostat isn’t exposed to direct sunlight, drafts, or heat sources like lamps, as these can skew the temperature sensor. Verify the thermostat is level on the wall; an uneven installation can affect accuracy.
Check for obstructions near the thermostat that might impede airflow. Compare the thermostat’s reading with a reliable thermometer placed nearby to confirm the discrepancy. Consider adjusting the temperature differential setting (though limited on this non-programmable model) which influences how much the temperature needs to change before the system activates.
If the problem continues, the thermostat’s sensor may be faulty, requiring replacement by a qualified HVAC professional. Avoid attempting internal repairs yourself.
System Not Responding to Thermostat
If your heating or cooling system isn’t responding to the Honeywell TH5220D1003, begin by checking the circuit breaker or fuse box to ensure power is supplied to the system. Verify the thermostat is set to the correct system mode (Heat, Cool, or Off) and that the set temperature is appropriately adjusted.
Inspect the wiring connections at both the thermostat and the HVAC unit, ensuring all wires are securely fastened and haven’t come loose. Confirm the system’s emergency switch isn’t turned off. A blown fuse within the HVAC unit itself could also be the culprit.
If these checks don’t resolve the issue, there may be a problem with the HVAC system itself, requiring professional diagnosis and repair. Do not attempt to repair the HVAC system without proper training.
Error Codes and Their Meanings
The Honeywell TH5220D1003 thermostat utilizes error codes to signal potential issues within the heating or cooling system. While this model is relatively simple, understanding these codes can aid in troubleshooting. A flashing display or specific character combinations indicate a problem.
Unfortunately, the TH5220D1003 has limited error code functionality compared to more advanced models. Common issues are often indicated by a completely blank display (power issue) or erratic temperature readings. If a specific code appears, consulting the full installation guide (available online as a PDF) is crucial.
For unresolved error indications, contacting Honeywell support directly is recommended. Professional HVAC technicians possess the expertise to accurately diagnose and resolve complex system errors.

Advanced Settings & Programming (Limited for Non-Programmable Model)
The TH5220D1003 is a non-programmable thermostat, offering limited advanced settings. Adjusting the temperature differential is the primary customization option available to users.
Understanding Non-Programmable Functionality
Unlike programmable thermostats, the Honeywell TH5220D1003 operates on a consistent, user-defined temperature setting. This means it doesn’t allow for pre-set schedules for different times of the day or days of the week.
Its simplicity is its strength; you set the desired temperature, and the thermostat maintains it. This makes it ideal for users who prefer a straightforward heating and cooling experience without the complexity of programming.
The absence of programming features doesn’t mean a lack of control. You can easily adjust the temperature up or down as needed, and select between Heat, Cool, or Off modes.
This model prioritizes ease of use, making it a great choice for those unfamiliar with advanced thermostat settings or those who simply want a reliable, no-fuss climate control solution. It’s a dependable option for consistent comfort.
Adjusting Temperature Differential
The temperature differential, often referred to as “cycle rate,” determines how much the room temperature needs to deviate from the setpoint before the heating or cooling system turns on or off.
The TH5220D1003 typically has a fixed differential, meaning it isn’t user-adjustable through the thermostat’s interface. This fixed differential is designed to provide efficient and consistent temperature control without requiring complex settings adjustments.
A smaller differential results in more frequent, shorter cycles, while a larger differential leads to less frequent, longer cycles. The factory setting aims for a balance between comfort and energy efficiency.
While not directly adjustable by the user, understanding this concept is helpful for diagnosing potential issues. If the system cycles too frequently or not enough, it might indicate a different underlying problem rather than a differential setting issue.

Technical Specifications
The TH5220D1003 operates on 24VAC power, handles temperatures between 40°F and 90°F, and is compatible with standard 24VAC heating and cooling systems.
Power Requirements
The Honeywell TH5220D1003 thermostat is designed to operate with a standard 24 Volt Alternating Current (VAC) power supply, commonly found in most residential heating and cooling systems. It does not require batteries for basic operation, relying instead on the consistent power provided by the HVAC system’s control transformer.
This 24VAC power is typically delivered through the ‘C’ (Common) wire connection. If your existing system lacks a ‘C’ wire, a ‘C’ wire adapter may be necessary for proper functionality – consult a qualified HVAC technician for assistance with this.
Important Note: Attempting to power the thermostat with any voltage other than 24VAC can cause permanent damage to the unit and potentially void the warranty. Always ensure the power supply is correctly configured before installation.
Temperature Range
The Honeywell TH5220D1003 thermostat is capable of accurately displaying and controlling temperatures within a broad range, suitable for most residential climates. The display temperature range extends from 40°F to 90°F (4.4°C to 32.2°C). However, the controllable temperature range – the settings you can actually program – typically falls between 50°F and 90°F (10°C and 32.2°C).
While the thermostat can display temperatures outside this control range, it won’t actively attempt to heat or cool your home below 50°F or above 90°F. This prevents unnecessary strain on your HVAC system.
Compatibility with Heating/Cooling Systems
The Honeywell TH5220D1003 thermostat demonstrates broad compatibility with a variety of common heating and cooling systems, making it a versatile choice for many homes. It supports single-stage and multi-stage conventional heating systems, including gas, oil, and electric furnaces. It also works effectively with central air conditioning systems, heat pumps (without auxiliary heat control), and even some millivolt systems.
However, it’s crucial to verify compatibility before installation. This thermostat is not designed for line voltage systems (110V/220V) or systems requiring advanced features like zoning or communicating protocols. Always consult a qualified HVAC technician if you’re unsure about compatibility with your specific system.
Important: Incorrect wiring or installation can damage both the thermostat and your HVAC equipment.

Resources & Support
For further assistance, Honeywell provides downloadable manuals in PDF format and comprehensive support via their contact information. Warranty details are also readily available online.
Downloading the Manual (PDF)
Accessing a digital copy of the Honeywell TH5220D1003 manual is straightforward and offers convenient offline access to crucial information. Several online repositories host the PDF version, allowing users to download it directly to their computers, tablets, or smartphones. ManualsLib is a prominent source, providing a readily available download link for the 21-page user manual.
Thermostat.guide also offers a downloadable installation guide for the TH5220D Non-Programmable Digital Thermostat. Having the PDF manual ensures you always have the necessary documentation at your fingertips, whether you’re installing the thermostat, troubleshooting issues, or simply need a refresher on its operating procedures. This eliminates the need to search for a physical copy and provides a portable, easily shareable resource.
Honeywell Support Contact Information
For direct assistance with your Honeywell TH5220D1003 thermostat, reaching out to Honeywell’s support team is a valuable option. While specific contact details aren’t explicitly provided in the readily available online resources, Honeywell offers comprehensive support through their official website. Navigating to the Honeywell Home website is the first step to accessing their support channels.
Users can typically find FAQs, troubleshooting guides, and contact forms for submitting inquiries. Depending on the nature of your issue, you may be able to connect with a support representative via phone or online chat. Remember to have your thermostat model number (TH5220D1003) readily available when contacting support to expedite the assistance process. Exploring the Honeywell Home website will provide the most up-to-date contact information.
Warranty Information
Regarding warranty coverage for the Honeywell TH5220D1003 thermostat, specific details are typically outlined in the documentation included with the product at the time of purchase. While readily available online resources don’t explicitly state the warranty terms, Honeywell generally offers a limited warranty on their thermostats, covering defects in materials and workmanship under normal use.
The duration of the warranty can vary, so it’s crucial to retain your proof of purchase (receipt or invoice) to validate any potential warranty claims. To obtain precise warranty information, it’s recommended to consult the original product packaging or visit the Honeywell Home website. There, you can find detailed warranty statements and instructions on how to initiate a claim if needed.
















































































