Honeywell Home T4 Pro User manual

Package Includes:
• T4 Pro Thermostat
• UWP™ Mounting System
• Decorative Cover Plate
• Screws and Anchors
• 2 AA Batteries
• Thermostat Literature
M37844
T4 Pro
Programmable Thermostat
TH4110U2005, TH4210U2002
User Guide
Call Customer Care toll-free at 18004681502.
Customer assistance
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
• FanSelect 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.
Read before installing

2
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)
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
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.
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.

3
Program Schedule
To adjust program schedules
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, see page 4.
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.
Heat Cool
Wake
(6:00 am)70 °78 °
Away
(8:00 am)62 °85 °
Home
(6:00 pm)70 °78 °
Sleep
(10:00
pm)62 °82 °

4
Program schedule override (permanent)
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” on page 3.
3 To cancel the Temporary Hold, Press or
and then press Cancel.
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 For C. Then press Select.
4 Press Select to save and exit F / C menu.

5
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.
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.
Built-in compressor protection
Message flashes until safe
restart time has elapsed.
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.

6
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.
Battery replacement
Insert fresh alkaline AA
batteries and reinstall
thermostat.
When the low battery
warning appears, press
gently to loosen the
thermostat and then
carefully pull it from the
wall mount.
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.

7
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.

8
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
(see page 6).
Heating
or cooling
system does
not respond
• Press Mode button to set system Heat (see page 2).
Make sure the desired temperature is set higher than the
inside temperature.
• Press Mode button to set system Cool (see page 2).
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); see page
2.
• 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 (see page 5).
Electrical Ratings
Terminal Voltage (50 Hz/60 Hz) Running Current
WHeating 20 Vac - 30 Vac 0.02 A - 1.0 A
W2 (Aux) Heating (TH4210U only) 20 Vac - 30 Vac 0.02 A - 1.0 A
EEmergency Heat (TH4210U only) 20 Vac - 30 Vac 0.02 A - 0.5 A
YCompressor Stage 1 20 Vac - 30 Vac 0.02 A - 1.0 A
GFan 20 Vac - 30 Vac 0.02 A - 0.5 A
O/B Changeover 20 Vac - 30 Vac 0.02 A - 0.5 A
L/A Input 20 Vac - 30 Vac 0.02 A - 0.5 A
NOTE: Not for use with 250, 500, or 750 MV systems.

9
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.
5-year limited warranty

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 Stateswww.resideo.com
© 2020 Resideo Technologies, Inc. All rights reserved.
The Honeywell Home trademark is used under license
from Honeywell International, Inc. This product is manu-
factured by Resideo Technologies, Inc. and its affiliates.
Tous droits réservés. La marque de commerce Honeywell
Home est utilisée avec l’autorisation d’Honeywell
International, Inc.
Ce produit est fabriqué par Resideo Technologies, Inc. et
ses sociétés affiliées.
Todos los derechos reservados. La marca comercial
Honeywell Home se utiliza bajo licencia de Honeywell
International, Inc.
Este producto es fabricado por Resideo Technologies, Inc.
y sus afiliados.
33-00188EFS-07
CAUTION: 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.
CAUTION: EQUIPMENT DAMAGE HAZARD
Compressor protection is bypassed during testing. To prevent equipment
damage, avoid cycling the compressor quickly.
CAUTION: ELECTRICAL HAZARD
Can cause electrical shock or equipment damage. Disconnect power before
beginning installation.