rth6350d1000 manual

Overview

The Honeywell RTH6350D1000/A is a programmable thermostat offering 24‑hour scheduling, eco‑mode, and Wi‑Fi connectivity. Its user‑friendly interface features a color display, rotary encoder, and touchscreen controls. The manual covers setup, wiring, programming, and troubleshooting. See wiring now

Installation and Wiring

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Before installing the Honeywell RTH6350D1000/A, ensure the power is off at the circuit breaker. The thermostat requires a 24‑V DC supply from the HVAC control board. Remove the existing thermostat, noting the wiring configuration. The RTH6350D1000/A uses the standard R, Y, G, W, and C terminals. The C wire is optional but recommended for stable operation. Follow the wiring diagram: connect the R wire to the R terminal, Y to the Y terminal, G to the G terminal, W to the W terminal, and C to the C terminal if present. If the system uses a 24‑V transformer, connect the transformer terminals to the R and C terminals on the thermostat. After wiring, secure the thermostat base plate to the wall with the provided screws. Re‑install the faceplate, and turn the power back on; Verify the thermostat displays the correct date, time, and temperature. If the display remains blank, double‑check the wiring connections and ensure the transformer is supplying 24 V. The thermostat will automatically detect the HVAC system type and configure itself accordingly. For systems with a 24‑V transformer and a 24‑V fan, the thermostat will enable the fan control automatically. If the system uses a 24‑V transformer with a 24‑V fan and a 24‑V heating coil, the thermostat will detect the heating coil and enable the heating control. The manual also includes a troubleshooting section for common wiring issues, such as “No Power” or “Fan Not Running.” Follow the step‑by‑step checks listed in the troubleshooting guide to resolve these problems. Once the thermostat is powered, use the “Setup” menu to enter the system type, set the time zone, and configure the 24‑hour schedule. The thermostat’s “Eco” mode can be enabled to reduce energy usage during off‑peak hours. For advanced users, the thermostat supports a 1‑wire temperature sensor for remote sensing. Install the sensor in the desired location, connect it to the sensor terminal, and enable the sensor in the “Temperature Sensor” menu. This feature allows the thermostat to adjust the setpoint based on the actual room temperature, improving comfort and efficiency. Finally, test the thermostat by cycling the heating and cooling modes, ensuring the fan runs as expected. If any issues arise, consult the troubleshooting section or contact Honeywell support for assistance. All steps verified! OK!!

Features and Specifications

The Honeywell RTH6350D1000/A is a versatile programmable thermostat designed for residential HVAC systems. Key features include a 24‑hour scheduling interface, dual‑zone control, and an Eco mode that automatically reduces heating or cooling during off‑peak hours. The thermostat offers Wi‑Fi connectivity, allowing remote access through the Honeywell Home app, and supports voice control via Amazon Alexa and Google Assistant. A 2‑inch color LCD display provides clear temperature readouts, while a rotary encoder and touchscreen enable intuitive local adjustments. The unit supports a 1‑wire temperature sensor for remote sensing, improving comfort and energy efficiency. Built‑in safety features such as a low‑voltage alarm and fan‑run detection help prevent system damage. The thermostat is compatible with most 24‑V HVAC systems, including furnaces, heat pumps, and air‑conditioners. It requires a 24‑V DC supply and optionally a C‑wire for stable operation. Physical dimensions are 3.5” x 3.5” x 0.9” (88.9 mm × 88.9 mm × 22.9 mm), and the weight is 0.5 lb (227 g). The device operates within a temperature range of 32°F to 104°F (0°C to 40°C) and a humidity range of 20% to 90% RH. Battery backup is not included; the thermostat relies on continuous power from the HVAC control board. Firmware updates are delivered over the air, ensuring the latest features and security patches. The RTH6350D1000/A is ENERGY STAR certified, meeting stringent efficiency standards for smart thermostats. Firmware 5.2.1 is current as of 2026‑07‑07 and alerts

Programming the Thermostat

To program the RTH6350D1000/A, press the Prog button until the display shows “Day:”. Use the ▲ and ▼ keys to set the current day of the week, then press Enter to confirm. The thermostat will display the current day and allow you to begin creating a schedule. You can also set a temperature offset for the day by selecting Offset.

Next, set the time by selecting Time from the main menu and adjusting hours, minutes, and AM/PM with the arrow keys. After confirming the clock, tap Schedule to begin creating a 24‑hour program. For each hour, choose Heat or Cool and input the desired temperature. The thermostat allows you to copy a schedule from one day to another by selecting Copy and choosing the source day. You can skip hours by selecting Off if no heating or cooling is required.

To enable Eco mode, navigate to Eco, toggle it on, and set the temperature limits. You can also set a fan schedule by selecting Fan and choosing On, Auto, or Off for each hour. The fan schedule can be set to run continuously, automatically, or off during each hour. Temperature offset can be applied to the entire schedule or to individual days by selecting Offset and entering the desired adjustment. The thermostat also allows you to set a temperature offset for winter or summer operation, which can be applied automatically when the system switches modes.

The thermostat supports remote scheduling via the Honeywell Home app. Log in, select the thermostat, and use the app’s calendar interface to adjust settings on the fly. The app also provides energy usage reports and allows you to set holiday schedules. You can view real‑time temperature, humidity, and system status, and receive alerts for any detected issues.

After all days are programmed, press Exit to return to the main screen. Remember to save any changes by pressing Enter before exiting the menu. This ensures the new program is stored in the device’s non‑volatile memory and will persist through power cycles. For advanced users, the Advanced menu offers additional options such as temperature offset per zone and holiday mode. If you encounter any issues, consult the troubleshooting section or contact Honeywell support for assistance. Press Back to return. Menu.

User Interface and Controls

The RTH6350D1000/A features a 2.4‑inch color LCD that displays temperature, humidity, and system status. The screen is protected by a tempered glass overlay and is readable under direct sunlight. A single rotary encoder with a central button provides navigation and selection. The encoder’s click sound indicates a successful press, while the button toggles between menus and submenus. The thermostat offers a Home screen that shows the current setpoint, indoor temperature, and fan status. From here, users can access Schedule, Eco, Fan, Settings, and Diagnostics by rotating the encoder and pressing the button to enter.

Home – Displays current temperature, humidity, and mode.
Schedule – Allows creation of 24‑hour programs for heating and cooling.
Eco – Enables energy‑saving mode with temperature limits.
Fan – Controls fan operation (On, Auto, Off).
Settings – Adjusts time, date, language, and system parameters.
Diagnostics – Shows error codes and system health.

Touch gestures are not supported; all interaction is through the encoder. The thermostat’s firmware updates automatically via Wi‑Fi, and the display will flash a notification icon when a new update is available. Users can also trigger a manual firmware check from the Settings menu. The device supports two temperature units (Fahrenheit and Celsius) selectable from the Settings screen. The Back button returns to the previous screen, while the Enter button confirms selections. For accessibility, the thermostat offers a high‑contrast mode that can be enabled in Settings. The interface is designed for quick, one‑hand operation, making it suitable for both residential and light commercial applications.

The thermostat’s intuitive design and robust build make it a reliable choice for homeowners seeking convenience and efficiency.

Remote Access and Compatibility

The Honeywell RTH6350D1000/A integrates seamlessly with the Honeywell Home app, enabling control via smartphones, tablets, and voice assistants such as Amazon Alexa and Google Assistant. After pairing the thermostat to a Wi‑Fi network, users can access real‑time temperature data, set schedules, and monitor energy usage from anywhere. The device supports WPA2‑PSK encryption for secure connectivity and automatically reconnects after power outages. Compatibility extends to HVAC systems that use standard 24‑V control signals, including furnaces, heat pumps, and air‑conditioners. The thermostat’s firmware allows for future upgrades, ensuring continued support for new protocols. Remote access is also available through the web portal, where users can log in with their Honeywell Home credentials to view system status, receive alerts, and adjust settings. The thermostat’s compatibility with the Honeywell Home ecosystem makes it a versatile choice for modern smart‑home setups.

Geofencing lets the thermostat adjust temperatures as you leave or return home. Multiple zones allow independent control of rooms or floors. Advanced users can access a RESTful API for custom dashboards. OTA firmware updates keep the device secure. The thermostat can send email or push alerts when temperatures exceed limits or faults occur. When the thermostat detects a fault, it logs the event and can notify the homeowner via the Honeywell Home app or email, ensuring maintenance and preventing repairs.

Maintenance and Cleaning

Regular upkeep ensures the RTH6350D1000/A operates at peak efficiency. Begin by turning off the thermostat and disconnecting the power supply. Use a soft, lint‑free cloth dampened with a mild soap solution to wipe the exterior display and housing. Avoid abrasive cleaners or solvents that could damage the LCD or paint.

Inspect the thermostat’s vents for dust accumulation. Gently blow air or use a vacuum with a brush attachment to clear debris. If the unit is installed in a humid area, consider a dehumidifier to reduce moisture buildup that can affect electronic components.

Check the battery compartment if the thermostat uses a backup battery. Replace the battery with a fresh one rated for the device, and reseal the compartment to prevent moisture ingress.

Periodically review the firmware version via the Honeywell Home app. Apply any available updates to keep the system secure. When updating, ensure the thermostat remains connected to Wi‑Fi and that the device is not powered down.

For HVAC‑connected models, verify that the 24‑V control wiring remains intact. Tighten loose terminals replace frayed wires. Inspect the furnace or heat‑pump control board for signs of corrosion overheating;

Finally, test the thermostat’s scheduling and sensor accuracy by comparing its readings to a calibrated thermometer. Adjust the temperature offset in the settings menu if discrepancies exceed 0.5°F. Document maintenance actions in a for future reference.

To install the RTH6350D1000/A, begin by turning off the main power and disconnecting the HVAC system’s 24‑V transformer. Wire the thermostat’s red, white, and yellow leads to the corresponding terminals on the transformer, ensuring correct polarity. Connect the green wire to the system’s ground. Verify continuity with a multimeter before powering on. The thermostat’s back panel includes a 24‑V input indicator that illuminates upon successful connection. For heat‑pump systems, enable the “Heat‑Pump” mode in the thermostat’s settings menu to allow proper communication between the thermostat and the heat‑pump control board.

The RTH6350D1000/A supports up to 24 programmable time slots per day, allowing users to set distinct temperatures for morning, afternoon, evening, and night periods. Eco‑mode automatically adjusts the temperature setpoints by ±2°F during off‑peak hours to save energy. The thermostat’s Wi‑Fi module connects to the Honeywell Home app, enabling remote control, scheduling, and firmware updates. Key specifications include a 3.5‑inch color LCD, 4‑wire compatibility, 24‑V power input, and a 4‑year limited warranty on the thermostat unit.

Programming the RTH6350D1000/A is straightforward. Press the “Program” button to enter the scheduling mode. Use the rotary encoder to navigate to the desired time slot and adjust the temperature with the +/- buttons. Confirm each setting by pressing the “Enter” button. The thermostat supports both 12‑hour and 24‑hour time formats, selectable from the main menu. Users can also set a “Vacation” mode to maintain a minimum temperature while away. The thermostat’s internal clock synchronizes with the Honeywell Home app when connected to Wi‑Fi, ensuring accurate timekeeping even after power outages.

The thermostat’s user interface consists of a 3.5‑inch color LCD, a rotary encoder, and a set of labeled buttons: “Program,” “Enter,” “Up,” “Down,” and “Menu.” The LCD displays the current temperature, setpoint, and mode (Heat, Cool, Eco, Off). The rotary encoder allows users to scroll through menu options, while the “Enter” button confirms selections. The “Program” button enters the scheduling mode, and the “Menu” button provides quick access to system settings such as Wi‑Fi configuration, fan control, and temperature offset. The thermostat also features a “Backlight” toggle to adjust screen brightness for low‑light environments.

The RTH6350D1000/A is compatible with Honeywell Home’s cloud platform, enabling remote access via the Honeywell Home app on iOS and Android devices. Users can view real‑time temperature data, adjust setpoints, and receive notifications about system status. The thermostat also supports integration with third‑party smart home ecosystems such as Amazon Alexa and Google Assistant through the Honeywell Home API. Compatibility with HVAC systems includes furnaces, heat‑pumps, and air‑conditioning units that use a 24‑V control voltage.

Check the battery compartment if the thermostat uses a backup battery. Replace the battery with a fresh one rated for the device, and reseal the compartment to prevent moisture ingress.

Troubleshooting Common Issues

When the RTH6350D1000/A fails to display, first check the power source. Ensure the thermostat is wired to a 24‑V transformer and that the transformer supplies voltage. If the display remains blank, test the power LED; a LED indicates a power fault. Replace the transformer or repair wiring as needed.

If the thermostat shows “No Signal” or “Wi‑Fi Error”, verify the network settings. Confirm that the router’s SSID and password match those entered on the thermostat. Re‑enter credentials through the menu, and restart the device. Ensure the router’s firmware is current and that the thermostat’s MAC address is blocked via firewall.

When temperature readings drift, check the sensor placement. The built‑in sensor should be in a area, away from direct heat sources, vents, drafts. If the thermostat is near a window or heat source, relocate it or use an external sensor if supported.

For “Schedule Not Working” issues, review the programmed schedule. Ensure that the “On/Off” switches are correctly set for each day and that the time zone is accurate. Reset the schedule to default and re‑program to rule out corrupted data.

In cases of “Eco‑Mode” not engaging, confirm that the eco‑temperature limits are set within the allowable range. If connected to a heat‑pump, verify that the heat‑pump’s compatible with the eco‑mode feature. Update firmware if a known bug is documented in the release notes for advanced users!

When the thermostat occasionally resets, inspect the battery compartment for corrosion or loose contacts. Replace the battery if it is low, and clean the contacts with a soft brush. If resets persist, consult the error code list and contact Honeywell support for advanced diagnostics.

Error Codes and Diagnostics

The RTH6350D1000/A uses a series of LED blink patterns to indicate error conditions. A single long blink followed by a short blink typically signals a communication failure with the HVAC system. Two long blinks indicate a sensor fault, while a rapid sequence of blinks points to a power supply issue. Users can reference the error code chart in the manual to diagnose and resolve these problems. For persistent errors, resetting the thermostat to factory defaults and re‑programming the schedule often resolves the issue. If problems continue, contact Honeywell support for further assistance.

Safety Precautions

Always disconnect the main power before working on the thermostat or HVAC system. Avoid touching exposed wiring or components while the system is powered. Use insulated tools and wear protective gloves to reduce the risk of electric shock. If the thermostat displays a fault code related to overheating, immediately turn off the HVAC system and allow it to cool before attempting repairs. Follow all local electrical codes and regulations when installing or modifying the thermostat.

Warranty and Support

The RTH6350D1000/A comes with a 4‑year limited warranty covering manufacturing defects and component failures. Warranty coverage excludes damage caused by improper installation, misuse, or environmental factors such as moisture, dust, or extreme temperatures. To claim warranty service, contact Honeywell customer support with proof of purchase and a detailed description of the issue. Replacement parts and repair services are available through authorized Honeywell service centers. For expedited support, users can access online resources, including troubleshooting guides, firmware updates, and FAQ sections on the Honeywell website.

FAQ

Q: Can I use the RTH6350D1000/A with a heat‑pump system?
A: Yes, the thermostat supports heat‑pump systems. Enable the “Heat‑Pump” mode in the settings menu to allow proper communication between the thermostat and the heat‑pump control board.

Q: How do I reset the thermostat to factory defaults?
A: Press and hold the “Program” button for 10 seconds until the display flashes “Reset.” Follow the on‑screen prompts to complete the reset process.

Q: What should I do if the thermostat’s Wi‑Fi connection drops?
A: Verify that the router’s SSID and password match those entered on the thermostat. Re‑enter credentials through the menu, and restart the device. Ensure the router’s firmware is current and that the thermostat’s MAC address is not blocked by a firewall.

Software Updates

The RTH6350D1000/A supports over‑the‑air firmware updates via the Honeywell Home app. Users can check for updates in the app’s “Device Settings” section. When an update is available, the app will prompt the user to download and install it. The thermostat will automatically reboot after the update is applied. It is recommended to perform updates during periods of low HVAC usage to avoid disruptions. Users can also manually trigger an update by selecting “Check for Updates” from the thermostat’s main menu. The update process typically takes 5–10 minutes, during which the thermostat’s display will show a progress bar. If the update fails, users should retry or contact Honeywell support for assistance.

Glossary of Terms

Eco‑Mode: A feature that automatically adjusts temperature setpoints by ±2°F during off‑peak hours to save energy.
Heat‑Pump: A device that transfers heat from one location to another, often used for heating and cooling in HVAC systems.
Wi‑Fi: Wireless networking technology that allows the thermostat to connect to the internet and be controlled remotely via the Honeywell Home app.
Firmware: Software that runs on the thermostat’s microcontroller, controlling its functions and features.
24‑V Transformer: A power supply that converts mains voltage to 24 volts, required for the thermostat’s operation.

Verify 24‑V transformer power and LED illumination; replace damaged wires if LED is off or dim.
Check Wi‑Fi settings—ensure SSID/password match, router firmware is current, and restart thermostat.
Review programmed schedule and time zone; reset to defaults and re‑program if “Schedule Not Working.”
Calibrate temperature sensor using the “Temperature Offset” adjustment if readings drift.
Inspect wiring to HVAC control board for correct polarity and secure connections; enable “Heat‑Pump” mode if applicable.
Refer to LED blink error codes: two long blinks + short blink signals a sensor fault, rapid short blinks indicate power issue.
Perform factory reset (hold Program 10 s) after all checks, then reinstall Wi‑Fi and scheduling.
Check error code chart in manual for detailed diagnostics and follow recommended actions for each fault.
Ensure thermostat’s firmware is up to date; download and install updates via Honeywell Home app to fix bugs and add features.
For heat‑pump systems, enable “Heat‑Pump” mode in thermostat settings to allow proper communication between thermostat and heat‑pump controller.
After all checks, perform a factory reset by holding the Program button for 10 s, then reinstall Wi‑Fi and scheduling information.
Verify the HVAC system’s power supply; ensure the transformer is not overloaded and the control board receives proper voltage.
Contact Honeywell support if issues persist.