Honeywell T4 Pro Thermostat TH4110U2005 Manual

Package Includes:

• T4 Pro Thermostat
• UWP™ Mounting System
• Decorative Cover Plate
• Screws and Anchors
• 2 AA Batteries
• Thermostat Literature

Read before installing

Thermostat controls

• System status information
  Cool On/Heat On/Em Heat On, Recovery, Compressor Protection
• Actual time
• Schedule information
  Following time based schedule
• Mode
  Select system mode
  Heat/Off/Cool/Auto/ EM Heat (emergency heat)
• Menu
  Press to display options.
  Start here to set a program schedule
• Indoor temperature setpoint
  Press + or – to change temperature setting
• Actual indoor temperature
• Temperature/ Navigation buttons
  Press to increase or decrease temperature setpoint and to navigate menus and menu options
• Fan
  Select Fan mode Auto/On

The screen will wake up by pressing any of the five buttons. If powered by the C wire, the screen stays lit for 45 seconds after you complete changes. If powered by battery only, the screen stays lit for 8 seconds. Depending on how your thermostat was installed, the screen light may always be on.

Customer assistance

Call Customer Care toll-free at 1-800-468-1502.

System operation settings

1. Press the Mode button to cycle to the next available System mode.
   
2. Cycle through the modes until the required System mode is displayed and leave it to activate.

NOTE: Available System modes vary by model and system settings.

System modes:

• Auto
• Heat
• Cool
• Off
• Em. Heat (TH4210U only)

Fan operation settings

1. Press the Fan button to cycle to the next available Fan mode.
   
2. Cycle through the modes until the required Fan mode is displayed and leave it to activate.

NOTE: Available Fan modes vary with system settings.

Fan modes:

• Auto: Fan runs only when the heating or cooling system is on.
• On: Fan is always on.

Set the time and date

Time

1. Press Menu, and then press + to go to TIME. Press Select.
2. Press + or - to choose between 12 or 24 hour. Press Select.
3. Use + or - to adjust the hour. Press Select.
4. Use + or - to adjust the minutes. Press Select to exit Time menu.

Date

1. If previously setting time, continue to Step If at the Home screen, press Menu on your thermostat.
2. Press + or - to go to DATE. Press Select.
3. Use + or - to adjust year. Press Select.
4. Use the + or - to adjust month. Press Select.
5. Use the + or - to adjust Date. Press Select to save and exit Date menu.

Program Schedule

You can program four time periods each day, with different settings for weekdays and weekends. We recommend the pre-sets (shown in the table below), since they can reduce your heating/cooling expenses.

Wake - Set to the time you wake up and the temperature you want during the morning, until you leave for the day.
Away - Set to the time you leave home and the temperature you want while you are away (usually an energy-saving level).
Home - Set to the time you return home and the temperature you want during the evening, until bedtime.
Sleep - Set to the time you go to bed and the temperature you want overnight (usually an energy-saving level).

NOTE: To temporarily or permanently override any of the above program schedules.

To adjust program schedules

1. Press Menu on your thermostat.
   
2. PROG is displayed. Press Select. Then ON is displayed. (If you do not want to use a schedule, press + or - to display OFF. Press Select.) Press Select.
3. Press + or - to select day or set of days to edit. Press Select.
4. Press + or - to select a schedule period to edit (Wake, Away, Home, and Sleep). Press Select.
5. ON is displayed. Press Select to keep the schedule period on. Or press + and then Select to turn off the schedule period.
6. Time starts blinking. Press + or - to adjust the schedule period start time. Press Select.
7. Temperature starts blinking. Press + or - to adjust the "Heat" setpoint temperature. Press Select. Press + or - to adjust the "Cool" temperature setpoint. Press Select.
8. Repeat steps 4 through 7 for the remaining schedule periods.
9. Press Home when you're finished to save and return to the home screen.
10. Schedule can be adjusted and turned ON or OFF by returning to Menu and following the steps provided above.

Program schedule override (temporary)

1. Press + or - to adjust the temperature.
   
2. Once at the desired setpoint temperature, no further action is needed. The new setpoint temperature will be held until the next scheduled time period begins. For more information on schedule time periods, see "Program Schedule".
3. To cancel the Temporary Hold, Press + or - and then press Cancel.

Program schedule override (permanent)

1. Press + or - to adjust the temperature.
   
2. TEMPORARY HOLD is displayed and the setpoint temperature flashes. While it's flashing, press Hold (Mode) button to change to Permanent Hold.
3. To cancel the Permanent Hold, press + or - and then press Cancel.

Setting degrees Fahrenheit (F) or Celcius (C)

1. Press Menu.
   
2. Press + or - to go to F / C. Press Select.
3. Press + or - for F or C. Then press Select.
4. Press Select to save and exit F / C menu.

Adjusting keypad lockout

1. Press Menu on the thermostat.
2. Press + or - to go to LOCK. Press Select.
3. Press + or - to go to OFF, PART, or ON, and then press Select.
   OFF: Unlocked, and full access allowed.
   PART: Partial lockout, allowing only the temperature to be changed.
   ON: No access allowed.
4. To unlock the keypad, press the CENTER button and then enter the password "1234". To enter the password, press + or - to change the first digit of the number. Then press Select. Repeat this process to enter the second through fourth digits of the number. Once all four numbers have been entered, press Select again.
5. This will unlock the keypad.
6. If the code is incorrect, the screen will flash the lines "--".
7. Press Back to go back a step to enter the correct number and press Select.
   NOTE: On some models, the keypad lockout setting is only available in the installer menu and not available in the user menu.

Adjusting idle backlight display brightness

1. Press Menu on the thermostat.
2. Press + or - to go to LITE. Press Select.
3. Current brightness setting is displayed (1-5).
4. Press + or - to adjust backlight brightness.
5. Press Select to save and exit LITE menu.
   NOTE: Backlight is only displayed if the C (common) wire is connected.

Adaptive Intelligent Recovery

Over time, the T4 Pro Thermostat "learns" how long it takes your system to reach the temperature you want. It turns on the heating or cooling system earlier to make sure you're comfortable at the time you expect.

Built-in compressor protection

Damage can occur if the compressor is restarted too soon after shutdown. This feature forces the compressor to wait for a few minutes before restarting.

During the wait time, the display will flash the message Cool On (or Heat On if you have a heat pump). When the safe wait time has elapsed, the message stops flashing and the compressor turns on.

Message flashes until safe restart time has elapsed.

Battery replacement

Batteries are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. If your thermostat was not wired to run on AC power, then batteries are required.

Install fresh batteries immediately when the low battery icon appears. The icon appears about two months before the batteries are depleted.

Even if the low battery icon does not appear, you should replace batteries once a year, or before leaving home for more than a month.

If batteries are inserted within two minutes, the time and day will not have to be reset. All other settings are permanently stored in memory, and do not require battery power.

NOTE: When replacing batteries, alkaline batteries are recommended.

When the low battery warning appears, press gently to loosen the thermostat and then carefully pull it from the wall mount.

Insert fresh alkaline AA batteries and reinstall thermostat.

Alerts

If there is an alert or reminder, the alert icon appears on the Home screen.

Low Battery Warning

1. The batteries need to be replaced when BATT, the alert icon , and the battery icon are displayed on the Home screen.
2. When the battery power is very low, the thermostat's backlight is disabled to save battery power.
3. When battery power is critically low, only BATT, the alert icon , and the battery icon are displayed.

Air Filter Reminder

1. The alert icon appears on the Home screen.
2. Press Menu, and then press until display shows ALRT.
3. Press Select to display which alert(s) are present.
4. The message REPL (REPLACE AIR FILTER) appears.
5. The reminder can be snoozed or cleared. Resideo recommends changing the air filter before clearing the reminder.
6. To snooze, press Select. The word SNZE (SNOOZE) appears.
7. Press Select again to snooze the reminder for 7 days.
8. To clear, press Select, and then press + to go to CLER (Clear).
9. Press Select to clear the air filter reminder.

Snoozing and Clearing Alerts or Reminders*

1. Press Menu, and then press + until display shows ALRT.
2. Press Select to display which alert(s) are present.
3. The word SNZE (SNOOZE) appears.
4. Press Select again to snooze the reminder for 7 days.
5. To clear the alert, press Select, and then press + to go to CLER (Clear).
6. Press Select to clear the reminder.

* Some alerts cannot be snoozed or cleared. Please call your local heating and cooling professional if this occurs. The heating and cooling system may require service.

Troubleshooting

If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.

Display is blank

• Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Make sure fresh AA alkaline batteries are correctly installed.

Heating or cooling system does not respond

• Press Mode button to set system Heat. Make sure the desired temperature is set higher than the inside temperature.
• Press Mode button to set system Cool. Make sure the desired temperature is set lower than the inside temperature.
• Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Wait 5 minutes for the system to respond.

Temperature settings do not change

• If display says "unlock"; see Adjusting keypad lockout. If not, verify you are in the correct mode (heat, cool, em heat or auto).
• If you are in the correct mode, but you cannot set the heat from 40°F to 90°F (4.5°C to 32°C), or set the cool from 50°F to 99°F (10°C to 37°C), you may have range-stops restricting your setting. Check with the installer to see if they set range-stops.

"Cool On" or "Heat On" is flashing

• Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor.

Electrical Ratings

NOTE: Not for use with 250, 500, or 750 MV systems.

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. If at any time during the warranty period the product is determined to be defective due to workmanship or materials, Resideo shall repair or replace it (at Resideo's option).

If the product is defective,

(i) return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or

(ii) call Resideo Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Resideo Return Goods, 1985 Douglas Dr. N., Golden Valley, MN 55422, or whether a replacement product can be sent to you. This warranty does not cover removal or reinstallation costs.

This warranty shall not apply if it is shown by Resideo that the defect was caused by damage which occurred while the product was in the possession of a consumer.

Resideo's sole responsibility shall be to repair or replace the product within the terms stated above. RESIDEO SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT.

Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.

THIS WARRANTY IS THE ONLY EXPRESS WARRANTY RESIDEO MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE FIVE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.

This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have any questions concerning this warranty, please write Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.

ELECTRICAL HAZARD
Can cause electrical shock or equipment damage. Disconnect power before beginning installation.

EQUIPMENT DAMAGE HAZARD
Compressor protection is bypassed during testing. To prevent equipment damage, avoid cycling the compressor quickly.

MERCURY NOTICE
If this product is replacing a control that contains mercury in a sealed tube, do not place the old control in the trash. Contact your local waste management authority for instructions regarding recycling and proper disposal.

www.resideo.com

Resideo Technologies Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
33-00188EFS—07 M.S. Rev. 04-20 | Printed in United States

© 2020 Resideo Technologies, Inc. All rights reserved.

The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies, Inc. and its affiliates.

Videos

How to Program Honeywell T4 Pro Video

HONEYWELL Home T4 Pro | HOW to Use MANUAL Override | Factory RESET | Menu & SETUP Options Video

Documents / Resources

References

• Smart Home Products and Systems | Resideo

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