Honeywell Home T10 Pro Smart Thermostat with RedLINK

Welcome

This user guide is designed to help you get acquainted with your new T10 Pro Smart thermostat with RedLINK. Check out the table of contents on page 2 to browse by topic.

Need help? Get in touch.

WEB: honeywellhome.com

PHONE: 1-800-633-3991

SOCIAL: Twitter: @HoneywellHome, Facebook: Honeywell Home

Thermostat Features

Flexible scheduling: You can choose to use location-based temperature control (geofence technology), program a set schedule or use a combination of both to make sure your home is always comfortable.

• Location-based temperature control: Using geofence technology, the T10 Pro Smart thermostat will automatically use your smartphone's location, which can save you energy when you leave and make your home comfortable by the time you return.
• Smart Scheduling: Adds a Sleep period to location-based temperature control.
• Time-based scheduling: You can program a schedule where every day is different, a schedule where weekdays and weekends are different or a schedule where every day is the same. There are four adjustable periods per day: Wake, Away, Home, and Sleep.
• No schedule: You can also choose not to set a schedule and adjust the thermostat manually.
• Schedule Using Sensors: Up to 20 wireless indoor temperature/humidity/motion sensors per thermostat. Sensor Priority for each program period or when used manually.

Tip: The Honeywell Home app can be used to manage multiple thermostats and multiple users in a household.

❗Smart Alerts: The T10 Pro Smart thermostat will send alerts for things like extreme indoor temperatures and reminders for things like filter changes.

Auto change from heat to cool: When Auto mode is selected, the T10 Pro Smart thermostat can automatically determine whether your home needs heating or cooling to reach the desired temperature.

Adaptive Intelligent Recovery: The T10 Pro Smart thermostat learns your heating and cooling cycle times to make sure the system delivers the temperature you want, when you want it.

Getting the Most from the T10 Smart Thermostat

• Prioritize Rooms: Prioritize a specific room or multiple rooms, or let comfort follow your move using built-in motion detection.
• Control on the Go: Adjust your thermostat from anywhere using your tablet or smartphone.
• Save Energy: With geofencing, you can save money on the most expensive part of your energy bill while you're away.
• Simple Installation: The thermostat automatically programs itself. Just answer a few simple questions and you'll be up and running in no time.
• Whole-Home Range: With a 200-foot range, 20 sensors with temperature, humidity, and occupancy detection can connect to your thermostat from throughout your home.
• Know Your Home Is Safe: Get customizable alerts on your mobile device when the basement is so cold a pipe could burst, or if the baby's room is getting too hot.

Using Your Thermostat

The screen will wake up by pressing the center area of the displayed temperature.

Indoor Temperature

Displays the current indoor temperature.

Current Priority

Displays the type of priority and number of rooms being prioritized.

Indoor Humidity

Displays the current indoor humidity.

Adjust Temperature: Touch the up and down arrows to set your desired temperature.

Menu: Contains features such as mode, fan, schedule, priority, and other thermostat settings.

Desired Temperature: Displays the desired temperature.

Using the Honeywell Home App

The Honeywell Home app allows for remote control and management of your thermostat.

Home Screen

The app's home screen displays the current temperature, humidity, and allows for quick adjustments to fan settings, system mode, desired temperature, sensor priority, and schedule type.

Menu Options

The app menu provides access to Automation (Geofence, Vacation), Home settings (Activity History, Add Users, Filter Reminder, Address), and Account management (Edit Account, About the app).

Main Menu on Thermostat

From the Home Screen, press the menu icon (three horizontal lines) at the bottom of the display. If the icon is not shown, touch the screen to wake the display first.

Main Menu Options

System Mode

(Available modes vary depending on how the thermostat was configured)

• Heat: Controls the heating system.
• Off: Turns the heating and cooling systems off.
• Cool: Controls the cooling system.
• Auto: When enabled, the thermostat will automatically use heating or cooling to reach the desired temperature. (Operation on page 9).
• Em Heat: Controls auxiliary or emergency heat; only available on systems with a heat pump. (Operation on page 9).

Fan

(Fan setting not available for all system types)

• Auto: Fan only runs with a call for heat or cool, or if set to run with Hum, Dehum, or Vent call.
• On: Fan runs continuously.
• Circulate: Fan runs randomly approx. 33% of the time to ensure air circulation.

Priority

If wireless indoor temperature/humidity/motion sensors are used, select which sensors are used for temperature control. You can choose active sensors (ones detecting motion) or manually select which sensors to use.

Schedule

• Create new schedule (Set a time-based schedule)
• Disable schedule
• Reset to default Schedule

NOTE: To enable geofencing, use the Honeywell Home app.

Management

Devices & Sensors

• View the temperature and humidity reading from individual sensors.
• Identify a wireless indoor sensor.
• Add a new wireless indoor sensor.
• Remove a wireless indoor sensor.

Thermostat Information

• Mac Address
• IP Address
• Date Code
• Model Number
• Build Date
• Collection Version
• Wi-Fi Bootloader Version
• Wi-Fi Application Version
• RedLINK Application Version

Equipment Status

• System mode
• Heat stages (on or off)
• Cool stages (on or off)
• Fan on or off
• IAQ (Hum, Dehum, or Vent) on or off

Dealer Information

• Model number
• Date code
• Dealer company name and contact information if provided by installer.

Configuration

• Wi-Fi
• Security
• Preferences
• Installer Options

Room Prioritization

The thermostat can prioritize specific rooms for temperature control based on manual selection or detected motion.

• Selected Rooms: Rooms you manually select create an average temperature in your home.
• Unselected Room: Will not contribute to the average temperature.
• Active Rooms: Rooms with detected motion are automatically selected to create an average temperature in your home.
• Room without Activity: No motion is detected. Will not contribute to the average temperature.
• Room with Activity: Motion is detected. Will contribute to the average temperature.

Selecting System Mode

Touch the homescreen to wake the thermostat, then touch the menu icon and select 'Select Mode'.

• Heat: Controls the heating system.
• Cool: Controls the cooling system.
• Off: Turns the heating and cooling systems off.
• Auto: Automatically uses heating or cooling to reach the desired temperature. (Operation on page 9).
• Em Heat: Controls auxiliary or emergency heat; only available on systems with a heat pump. (Operation on page 9).

Notes:

• All available modes may not be shown for some applications. Scroll down to see more mode options.
• Auto mode may not appear depending on your equipment configuration.
• When Auto is selected, 'Heat to' and 'Cool to' will both be shown from the 'active' home screen.
• Em Heat is only available for heat pump systems configured for auxiliary/emergency heat.

Auto Changeover Operation

Auto changeover is available if the thermostat is configured for at least 1 heat stage and 1 cool stage, and the installer enabled it. When enabled, 'Auto' can be selected under 'System mode'. In auto mode, the customer can set heat and cool setpoints to the same temperature, though a cool setpoint at least 3 degrees above the heat setpoint is preferred. A 1.5°F differential is enforced to prevent rapid cycling between heat and cool. The differential is the minimum temperature change required before switching modes. For example, with a 3-degree differential, if heat and cool were both set to 70°F, cooling would only engage if the temperature rose 3°F above the heat setpoint. Similarly, heating would only engage if the temperature dropped 3°F below the cool setpoint. If AC is used for dehumidification, an additional temperature drop is enforced before switching back to heat.

Em Heat Mode

Emergency heat runs when manually switched to em heat mode. The heat pump is locked out, and backup heat is used to maintain the setpoint. This mode is only available for heat pump systems configured with backup heat by the installer. Access it via the menu icon and 'System Mode'.

Setting the Fan

Note: Fan setting may not be available for all system types.

1. Touch any part of the display to wake the thermostat.
2. Touch the MENU icon.
3. Touch Fan.
4. Choose 'on', 'auto', or 'circulate'.

Fan Modes:

• Auto: Only runs the fan with the heating or cooling system.
• On: Runs the fan continuously.
• Circulate: Runs the fan approx. 33% of the time for air circulation.

*The fan may also run with the humidifier, dehumidifier, or ventilator depending on configuration.

Scheduling the Fan: You can set the fan to on, auto, or circ for each program when using time-based scheduling or geofencing.

Setting the Time/Date

When the thermostat is linked to Wi-Fi and registered with the Honeywell Home app, the date and time update automatically. If not using Wi-Fi, manual setup is required:

1. Wake the thermostat.
2. Touch the MENU icon.
3. Scroll down and select 'Preferences'.
4. Select 'Date and Time'.

Set Date: If incorrect, touch 'date'. Use scroll controls to set the correct month, day, and year. Touch 'Done'.

Set Time: If incorrect, touch 'time'. Use scroll controls to set the correct hour, minutes, and am/pm. Touch 'Done'.

Use the arrow icons to navigate back through menus or to the home screen.

Wi-Fi Settings and Connectivity

Connect to Wi-Fi

1. Open the Menu.
2. Scroll to and select 'Wi-Fi'.
3. Tap 'Choose Network'.
4. Select a network and enter the password.

Connect to the Honeywell Home App

1. Open the Menu.
2. Tap 'Connect App'.
3. Follow the on-screen instructions.

The app guides you through selecting the thermostat model and location.

Enabling or Disabling Wi-Fi

On Thermostat

Enable Wi-Fi

1. Wake the thermostat.
2. Touch the MENU icon.
3. Scroll down and select 'Wi-Fi'.
4. Verify 'Enable' is selected.

Connecting to a Wi-Fi Network

1. Verify Wi-Fi is enabled.
2. Touch 'Choose network'.
3. Select your network and enter the password.

Disable Wi-Fi

1. Wake the thermostat.
2. Touch the MENU icon.
3. Scroll down and select 'Wi-Fi'.
4. Verify 'Enable' is de-selected.

Disconnecting from a Wi-Fi Network

1. Wake the thermostat.
2. Touch the MENU icon.
3. Scroll down and select 'Wi-Fi'.
4. Touch 'Choose network'.
5. Select the network you wish to connect to and enter the password.

Scheduling Options

Setting a Schedule on Thermostat

Select the menu icon, then 'Schedule'.

• Grouped Days: For all days to have the same schedule. Touch the period (Wake, Away, Home, Sleep) to edit.
• Single Days: For different schedules on different days. Touch the period to edit.

Within a period, you can edit:

• Time: Set the start time for the period.
• Priority: Select which sensors are used.
• Temperature: Set the heat and cool setpoints.
• Fan: Select fan mode (on, auto, circ). (See page 10).

You can also 'Create New Schedule', 'Disable Schedule', or 'Reset to Default Schedule'.

NOTE: To utilize Geofencing, set the schedule through the Honeywell Home app.

Scheduling Through the App

The Honeywell Home app offers flexible scheduling options:

• Location-based temperature control (Geofencing): Uses your smartphone's location to adjust temperature automatically.
• Smart scheduling: Adds a Sleep period to location-based control.
• Time-based scheduling: Program daily, weekday/weekend, or same-day schedules with four periods (Wake, Away, Home, Sleep).
• No schedule: Manual adjustment only.
• Sensor Priority: Select sensors for each program period or manual use.

To schedule via the app:

1. Select the thermostat in the Honeywell Home app.
2. Touch the calendar icon.
3. Choose 'Grouped Days' or 'Single Day'.
4. Select 'Options' to turn the schedule off, create a new time-based schedule, or switch to Geofencing.
5. Set priority sensors for each program.

Geofence Adjustment: Open the app, tap the menu icon, select 'Geofence', tap 'Geofence Radius', and drag the black dot on the map to adjust the boundary. Tap 'SAVE' to finish.

Schedule Override on Device

With the thermostat in heat, cool, auto, or em heat mode, press the up or down arrow to change the setpoint. If scheduling is enabled, the display will show 'Hold until' with a time. Touch this to access hold options:

• Next Period
• A Specific Time
• Permanently
• Remove hold

Choose an option and press 'Done' to return to the Home screen.

Setting Preferences

The Preferences menu allows customization of thermostat display and behavior.

To access Preferences:

1. Wake the thermostat.
2. Touch the MENU icon.
3. Scroll down and select 'Preferences'.

Options include:

• Display: Temperature units (F/C), Language (English, French, Spanish), Idle Screen Style (Temperature or Analog Clock), Inactive backlight settings (0-100%), Indoor display offsets, Clean screen (locks screen for 30 seconds).
• Date and Time: Set date, time, 12/24 hour clock, and daylight savings time.
• Reminders: For IAQ equipment like filters, humidifiers, ventilators, UV bulbs. (Varies based on installed equipment).
• Adaptive Recovery: Turn On or Off.

Touch 'Done' to save settings.

Cleaning and Security

Cleaning the Thermostat Screen

To clean the screen, select 'Clean Screen' from the Preferences > Display menu. The screen locks for 30 seconds. Use a damp cloth with water or glass cleaner; avoid abrasive cleansers and spraying liquid directly on the thermostat.

Adjusting Security Settings

Prevent unauthorized changes by adjusting security options:

1. Wake the thermostat.
2. Touch the MENU icon.
3. Scroll down and select 'Security'.
4. Select 'Change lock mode' or 'create password'.

Lock Mode Options:

• Unlocked: Full access.
• Partially Locked: Only temperature can be changed.
• Fully Locked: No access allowed.

NOTE: Write down any created password for reference.

Indoor Air Quality Control

Humidification

The thermostat reads indoor humidity and allows setting a humidification level, with or without window protection.

Control Humidification Level: Navigate via MENU > Humidification. Use ^ or v to select level, then 'Done'.

Window Protection: If frost/condensation appears, access via MENU > Options > Window Protection Level. This feature limits humidity to prevent frost/condensation on windows. It uses a scale of 1-10 (1=poorly insulated windows, 10=well insulated). A lower number reduces humidity. If indoor air is too dry, use a higher number. Window Protection requires an outdoor sensor or internet connection.

Dehumidification

The thermostat controls indoor humidity using the cooling system or a whole house dehumidifier.

Control Dehumidification Level: Navigate via MENU > Dehumidification. Use ^ or v to select level, then 'Done'. 'Options' allows enabling/disabling the dehumidifier.

NOTE: If the AC is used for humidity control, the temperature may drop up to 3°F below the setting. If humidification and dehumidification are active in the same system mode, a 15% deadband is enforced. Dehumidification overcooling limit (cooling droop) allows the cooling system to lower temperature up to 5°F below the setpoint.

Ventilation

Control ventilation levels and modes.

Control Ventilation Level: Navigate via MENU > Ventilation. Select mode: Auto (installer programmed), On (always on), or Off (unless timed). The status will show if the ventilator is running.

Timed Ventilation: Temporarily turn the ventilator on using the up arrow (0-180 minutes). 'Cancel Timed Ventilation' to stop. This is not available when the ventilator is set to 'On'.

Lockout During Sleep: In the ventilation menu, select 'options' to disable ventilation during 'Sleep' periods.

Lockouts and run ventilation: It's recommended to increase ventilation rate (CFM) to meet ASHRAE 62.2 standards for shorter run times.

Advanced Features

Adaptive Intelligent Recovery

The thermostat learns how long your system takes to reach a programmed temperature setting. It turns on the heating/cooling system early to ensure the desired temperature is met at the programmed time. The display shows 'In Recovery' when this occurs. The system calculates a recovery ramp based on room temperature, equipment performance, and weather history.

Compressor Protection

The thermostat keeps the compressor off for a few minutes before restarting to prevent equipment damage. 'Waiting for Equipment' is displayed during this time.

P + I Control

This thermostat uses a proportional plus integral (P + I) control algorithm for precise temperature management, eliminating the offset (droop) found in conventional thermostats. It compares sensed temperature to setpoint and considers the duration of any deviation to accurately control the cycle rate.

*Droop is used for aux heat control on heat pump systems with electric heat strips or gas/oil furnaces as backup heat.

Alerts and Notifications

A red dot above the Menu icon indicates an active alert or notification. Touch the Menu icon to view active Alerts & Notifications, then touch 'Notifications' to open the menu. Touch the alert message for more details.

When an alert is active, you must acknowledge the notification banner before accessing the menu icon.

Alerts

The following table lists common alerts, their meanings, and recommended actions.

IAQ Reminders

Set up IAQ reminders for filter changes, pad replacements, etc. Available reminders depend on installed equipment.

Available Reminders: Air Filter 1 & 2, Electronic Air Cleaner Pre/Post-Filter, Humidifier Tank/Water Filter, Humidifier Pad, Dehumidifier Filter, Ventilator Core & Filter, UV Bulb 1 & 2.

To access or adjust reminder settings:

1. Wake the thermostat.
2. Touch the MENU icon.
3. Scroll down and select 'preferences'.
4. Select the desired reminder.
5. Use ^ or v to set the timer length.
6. Press 'Done' to save.
7. Press 'Reset Timer' after maintenance.

NOTE: Fan run time is counted when there is a call for forced air heating, cooling, or fan.

Wireless Sensor Information

Check the status of linked wireless sensors.

Checking the status of a sensor

1. Wake the thermostat.
2. Touch the MENU icon.
3. Scroll down and touch 'Devices and Sensors'.

You can view sensors, add sensors, or identify them. Touching 'Identify' and then pressing a button on the sensor cover will display its room name. Touching a sensor name provides detailed information.

Device Info

Displays model, version, battery status, wireless signal strength, temperature reading, and humidity reading.

Motion Sensitivity

Adjust motion sensitivity settings (High, Medium, Low) for sensors. 'Blink lights' can be used to locate a sensor.

Battery Replacement (indoor sensor)

The T10 thermostat is powered by the HVAC transformer. Wireless indoor sensors use AAA Alkaline batteries.

Battery Warning: A warning appears on the thermostat screen about 60 days before batteries are depleted. A flashing red status light indicates critically low battery power (2-3 weeks remaining).

To replace batteries:

1. Remove the sensor cover.
2. Install 2 fresh AAA alkaline batteries. A green light indicates good batteries; red indicates fresh batteries are needed.
3. Snap the cover back on. The sensor will reconnect to the thermostat shortly.

Frequently Asked Questions (FAQs)

Wi-Fi Connection Questions

• Q: Will the thermostat still work if Wi-Fi is lost? A: Yes, manual adjustments are possible. Features like geofencing require Wi-Fi. The thermostat will reconnect automatically.
• Q: How to extend Wi-Fi signal strength? A: Move your router closer or use a stronger signal router.
• Q: Alert: 'Wi-Fi signal lost' A: Wait 5 minutes for reconnection or select an alternate network in the app. Troubleshoot router if needed.

Honeywell Home Account and App Questions

• Q: Why haven't I received an activation email? A: Check Spam folder. If not found, tap 'Resend'. Contact Technical Support at 1-800-633-3991 if still not received.
• Q: Can I set up my thermostat with multiple users? A: Yes. Log into the app, select 'Manage Users', tap 'Add User', and enter email addresses. Users with existing accounts will have the thermostat added. New users will receive an email to create an account.
• Q: Can I set up location-based temperature control with multiple users? A: Yes. Geofencing activates based on the last person leaving and first returning. Each user needs their own account.
• Q: Why doesn't an app change show on the thermostat? A: There may be a short delay. Wait a few minutes. Ensure the thermostat is connected to Wi-Fi and restart the app.

Software and Security Questions

• Q: How to ensure the thermostat has the latest firmware? A: When connected to Wi-Fi, it automatically receives over-the-air firmware updates for new features and security.
• Q: How to prevent unauthorized changes? A: Change your Wi-Fi router's default password to a strong one using mixed case letters and special characters.

Other Questions

• Q: How to safely remove the thermostat? A: Ideally, have a trained professional do it. If DIY, turn off the circuit breaker controlling the HVAC equipment before disconnecting wires. If unsure, shut off the main breaker.
• Q: How to uninstall the T10 Pro Smart thermostat with RedLINK? A: Clear personal settings. Reset Wi-Fi and HomeKit settings if previously connected.
• Q: Is there a motion sensor in the thermostat? A: No, there is not.
• Q: What happens if 'Active rooms' is used and no motion is detected? A: The thermostat's internal sensor is used, and remote sensors are excluded. 'Selected sensors' are often preferred for sleep periods.
• Q: How long are rooms considered active after motion? A: The sensor uses a dynamic algorithm; a brief walk through a room might register as occupied for 10 minutes. Longer presence extends this.
• Q: How do wireless indoor sensors detect motion? A: They use a Passive Infrared Sensor (PIR) detector.
• Q: How does motion-based priority work with multiple people? A: If set to 'Active Rooms', any room detecting motion is prioritized, and its temperature is averaged. If people leave, the sensor waits for the timeout.
• Q: What's the range of motion sensor detection? A: Typically 20-30 feet, affected by factors like height, clothing, and angle.

Troubleshooting

Display is blank

• Check circuit breaker and reset.
• Ensure power switch for heating/cooling is on.
• Make sure furnace door is closed securely.
• Verify C-wire connection.
• Check R/Rc slider tab setting (refer to wiring diagrams).

Heating or cooling system does not respond

• Set to Heat mode: Menu > System Mode > Heat > Done. Ensure desired temperature is higher than indoor temp.
• Set to Cool mode: Menu > System Mode > Cool > Done. Ensure desired temperature is lower than indoor temp.
• Check circuit breaker and reset.
• Ensure power switch for heating/cooling is on.
• Make sure furnace door is closed securely.
• Wait 5 minutes for the system to respond.

Temperature settings do not change

Ensure desired temperature is within acceptable ranges:

• Heat: 40°F to 90°F (4.5°C to 32.0°C)
• Cool: 50°F to 99°F (10.0°C to 37.0°C)

Aux heat runs in cooling

For heat pump systems, verify there is not a wire attached to W on the UWP.

Cool runs with a call for heat

For heat pump systems, verify there is not a wire attached to W on the UWP.

Sensor will not connect

• Press and hold 'Connect' on the wireless sensor for 15 seconds (LED turns Amber).
• Return to thermostat menu and press Menu > Devices and Sensors. Follow on-screen instructions to add the sensor.

Specifications

Temperature Ranges

• Heat: 40°F to 90°F (4.5°C to 32.0°C)
• Cool: 50°F to 99°F (10.0°C to 37.0°C)

Operating Ambient Temperature

• 32°F to 120°F (0°C to 48.9°C)

Shipping Temperature

• -20°F to 120°F (-28.9°C to 48.9°C)

Operating Relative Humidity

• 5% to 90% (non-condensing)

Physical Dimensions (H x W x D)

• T10 PRO Wi-Fi Thermostat: 4.9" x 3.7" x 0.93" (125.4 x 94.1 x 23.68 mm)
• UWP Mounting System (included): 2-9/32" x 2-13/64" x 2-43/64" (58 x 56 x 10 mm)
• Standard Installation Adapter (included): 3-29/32" x 3-57/64" x 21/32" (99 x 99 x 17 mm)
• Cover Plate - Medium (included): 5-11/64" x 5-1/2" x 11/16" (131.4 x 139.7 x 17.5 mm)
• Cover Plate - Large (THP2400A1068): 6-7/64" x 6-7/64" x 9/32" (155 x 155 x 7 mm)

Electrical Ratings

Power Consumption

3 VA

Regulatory Information

FCC REGULATIONS § 15.19 (a)(3)

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference, and 2. This device must accept any interference received, including interference that may cause undesired operation.

IC REGULATIONS RSS-GEN

This device complies with Industry Canada's license-exempt RSSs. Operation is subject to the following two conditions: 1. This device may not cause interference; and 2. This device must accept any interference, including interference that may cause undesired operation of the device.

FCC Warning (Part 15.21) (USA only)

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

Disposal

This product should not be disposed of with other household waste. Check for the nearest authorized collection centers or authorized recyclers. The correct disposal of end-of-life equipment will help prevent potential negative consequences for the environment and human health.

Warranty Information

5-year limited warranty

Resideo warrants this product, excluding battery, to be free from defects in workmanship or materials, under normal use and service, for a period of five (5) years from the date of first purchase by the original purchaser. Resideo shall repair or replace defective products at its option.

If the product is defective:

1. Return it with proof of purchase to the place of purchase.
2. Or, call Resideo Customer Care at 1-800-633-3991. They will advise if the product should be returned to: Resideo Return Goods, 1985 Douglas Dr. N., Golden Valley, MN 55422, or if a replacement can be sent.

This warranty does not cover removal or reinstallation costs. It does not apply if the defect was caused by damage occurring while the product was in the consumer's possession.

Resideo's sole responsibility is to repair or replace the product. Resideo shall not be liable for any incidental or consequential damages.

Some states do not allow limitations on incidental or consequential damages.

This is the only express warranty Resideo makes. Implied warranties are limited to the five-year duration of this warranty. Some states do not allow limitations on how long an implied warranty lasts.

This warranty grants specific legal rights; other rights may vary by state.

For questions, write to Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-633-3991.