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Honeywell T6 Pro TH6220U2000 TH6210U2001 TH6320U2008

T6 Pro Programmable  
Thermostat  
User Guide  
+
Package Includes:  
T6 Pro Thermostat  
UWP™ Mounting System  
Decorative Cover Plate  
Screws and Anchors  
2 AA Batteries  
M37762  
TH6320U2008,  
TH6220U2000,  
TH6210U2001,  
Thermostat Literature  
Read before installing  
Thermostat controls  
System status  
 Indoor temperature  
information  
setpoint  
Cool On/Heat On/Em Heat  
On, Recovery, Compressor  
Protection  
Press + or – to change  
temperature setting  
Actual indoor  
temperature  
Schedule information  
Following time based  
schedule  
Temperature/  
Navigation buttons  
Actual time  
Press to increase or  
Mode  
decrease temperature  
setpoint and to navigate  
menus and menu options  
Select system mode Heat/  
Off/Cool/Auto/EM Heat  
(
emergency heat)  
Fan  
Menu  
Select Fan mode Auto/On/  
Circulate  
Press to display options.  
Start here to set a program  
schedule  
M36224A  
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  
Visit https://www.honeywellhome.com/support  
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  
M36117  
Heat  
Cool  
Em Heat  
Off  
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.  
M35959  
On: Fan is always on.  
Circ: Fan runs randomly about 33% of the time.  
Set the time and date  
Time  
1
2
3
Press Menu on your thermostat.  
Press or to go to TIME. Press Select.  
Press or to choose between 12 or 24 hour.  
Press Select.  
4
5
Use or to adjust the hour. Press Select.  
Use or to adjust the minutes. Press Select  
to exit Time menu.  
M35966  
Date  
1
If previously setting time, continue to Step  
2. If at the Home screen, press Menu on your  
thermostat.  
2
3
4
5
Press or to go to DATE. Press Select.  
Use or to adjust year. Press Select.  
Use the or to adjust month. Press Select.  
Use the or to adjust day. Press Select to  
save and exit Date menu.  
M36119  
2
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.  
Heat  
Cool  
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).  
Wake  
°
6:00 am) 70 78  
Away  
°
°
°
°
°
(
(
8:00 am) 62 85  
Home  
°
(6:00 pm) 70 78  
Sleep  
°
(
10:00 pm) 62 82  
M36013  
NOTE: To temporarily or permanently override any of the above program  
schedules, see page 4.  
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
4
Press or to select day or set of days to  
edit. Press Select.  
Press or to select a schedule period to  
edit (Wake, Away, Home, and Sleep). Press  
Select.  
M35966  
5
ON is displayed. Press Select to keep the  
schedule period on. Or press and then Select  
to turn off the schedule period.  
6
7
Time starts blinking. Press or to adjust  
the schedule period start time. Press Select.  
Temperature starts blinking. Press or  
to adjust the “Heat” setpoint temperature.  
Press Select. Press or to adjust the “Cool”  
temperature setpoint. Press Select.  
8
9
1
Repeat steps 4 through 7 for the remaining  
schedule periods.  
Press Home when you’re finished to save and  
return to the home screen.  
0 Schedule can be adjusted and turned ON or  
OFF by returning to Menu and following the  
steps provided above.  
3
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.  
M36240  
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.  
Hold  
3
To cancel the Permanent Hold, press or  
and then press Cancel.  
M36241  
4
Adjusting keypad lockout  
1
2
3
Press Menu on the thermostat.  
Press or to go to LOCK. Press Select.  
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
6
7
This will unlock the keypad.  
If the code is incorrect, the screen will flash the lines "--".  
Press Back to go back a step to enter the correct number and press Select.  
NOTE: On some models, the keypad lockout setting is not available in the user  
menu if the installer didn’t configure the thermostat to allow this setting.  
Adaptive Intelligent Recovery  
Over time, the T6 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.  
Message flashes until safe  
restart time has elapsed.  
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.  
M35968  
5
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.  
M36010  
When the low battery  
warning appears, carefully  
pull the thermostat from  
the wall mount.  
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.  
M36114  
Insert fresh alkaline AA  
batteries and reinstall  
thermostat.  
NOTE: When replacing batteries, alkaline  
batteries are recommended.  
M36116  
Alerts  
If there is an alert or reminder, the alert icon  
appears on the Home screen.  
Heat  
Fan On  
Low Battery Warning  
1
2
3
The batteries need to be replaced when  
BATT, the alert icon , and the battery icon  
are displayed on the Home screen.  
When the battery power is very low, the  
thermostat’s backlight is disabled to save  
battery power.  
M36141  
When battery power is critically low, only  
BATT, the alert icon  
are displayed.  
, and the battery icon  
Back  
Home  
M36142  
6
Air Filter Reminder  
1
2
3
4
5
The alert icon  
screen.  
appears on the Home  
Press Menu, and then press until display  
shows ALRT.  
Press Select to display which alert(s) are  
present.  
Back Select  
Home  
The message REPL (REPLACE AIR FILTER)  
appears.  
M36144  
The reminder can be snoozed or cleared.  
Resideo recommends changing the air filter  
before clearing the reminder.  
6
7
8
9
To snooze, press Select. The word SNZE  
(
SNOOZE) appears.  
Press Select again to snooze the reminder for  
days.  
7
To clear, press Select, and then press to go  
to CLER (Clear).  
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
4
The word SNZE (SNOOZE) appears.  
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).  
M36145  
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.  
7
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  
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.  
or cooling  
system does  
not respond  
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 Make sure heating and cooling temperatures are set to  
settings do  
not change  
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)  
Cool On” or  
Heat On” is  
Compressor protection feature is engaged. Wait 5 minutes  
for the system to restart safely, without damage to the  
compressor (see page 5).  
flashing  
Electrical Ratings  
Terminal  
Voltage  
50 Hz/60 Hz)  
20 Vac - 30 Vac  
20 Vac - 30 Vac  
20 Vac - 30 Vac  
20 Vac - 30 Vac  
Running Current  
(
W Heating  
0.02 A - 1.0 A  
0.02 A - 1.0 A  
0.02 A - 0.5 A  
0.02 A - 1.0 A  
0.02 A - 1.0 A  
0.02 A - 0.5 A  
0.02 A - 0.5 A  
0.02 A - 0.5 A  
W2 (Aux) Heating  
E Emergency Heat  
Y Compressor Stage 1  
Y2 Compressor Stage 2 20 Vac - 30