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Honeywell Home T4 Pro Thermostat User Manual


The Honeywell T4 Pro is a smart thermostat that can be controlled remotely from any computer or smartphone. This manual will walk you through the installation process and give you some tips on how to use your new thermostat.

T4 Pro Programmable Thermostat TH4110U2005, TH4210U2002
T4 Pro Thermostat Drawn Diagram

Package Includes

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

Read before installing

Thermostat Controls

T4 Pro Thermostat Button Explanations

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

For assistance with this product, please visit Honeywellhome.com/support

System Operation Settings

How to operate the thermostat

  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

Fan operation button

  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

Setting the time button

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

Date

Setting the time diagram

  1. If previously setting time, continue to Step 2. 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.

Program schedule table

  • 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

Adjusting the program schedules on the thermostat

  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 PLUS or MINUS to display OFF. Press Select.) Press Select.
  3. Press  PLUS or MINUS to select day or set of days to edit. Press Select.
  4. Press PLUS or MINUS 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  PLUS and then Select to turn off the schedule period.
  6. Time starts blinking. Press PLUS or MINUS to adjust the schedule period start time. Press Select.
  7. Temperature starts blinking. Press PLUS or MINUS to adjust the “Heat” setpoint temperature. Press Select. Press PLUS or MINUS 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)

Temporarily delay the schedule using the PLUS or MINUS buttons

  1. Press PLUS or MINUS 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.
  3. To cancel the Temporary Hold, Press PLUS or MINUS and then press Cancel.

Program Schedule Override (permanent)

Permanently delay the schedule using the PLUS or MINUS buttons

  1. Press PLUS or MINUS 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 PLUS or MINUS and then press Cancel.

Setting Degrees Fahrenheit Or Celcius

Setting degrees Celsius or Fahrenheit on the thermostat display

  1. Press Menu.
  2. Press PLUS or MINUS to go to F / C. Press Select.
  3. Press PLUS or MINUS 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 PLUS or MINUS to go to LOCK. Press Select.
  3. Press PLUS or MINUS 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 PLUS or MINUS to go to LITE. Press Select.
  3. Current brightness setting is displayed (1-5).
  4. Press PLUS or MINUS 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.

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.

Alerts

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

Low Battery Warning

Low battery warning example diagram

  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

Air filter reminder prompt

  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 PLUS to go to CLER (Clear).
  9. Press Select to clear the air filter reminder.

Snoozing And Clearing Alerts Or Reminders*

Snoozing example diagram

  1. Press Menu, and then press PLUS 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 PLUS 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 the circuit breaker and reset if necessary.
  • Make sure the 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 page 5. 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

Electrical ratings table

5-year Limited Warranty

For warranty information go to Honeywellhome.com/support

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