Honeywell Home T3 Pro User manual

Package Includes:
• T3 Pro Thermostat
• UWP™ Mounting System
• Decorative Cover Plate –
Small; Size 4.72” H X 5.9” W
(120 mm H X 150 mm W)
• Screws and Anchors
• 2 AA Batteries
• Thermostat Literature
T3 Pro
Thermostat
User Guide
TH3110U2008,
TH3210U2004
Read before installing
Heat On
Menu
Fan Auto
Heat On
Menu
Fan Auto
Call Customer Care toll-free at 18004681502.
Customer assistance
Thermostat controls
The screen will wake up by pressing any of the three 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
• System status
information
Cool On/Heat On/Em
Heat On, Compressor
Protection
• 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
• Menu
Press to display
options. Change mode
(Heat, Off, Cool) or Fan
settings options.

2
System operation settings
1. Press Menu, and then 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 then press
Done.
NOTE: Available System modes vary by model
and system settings.
System modes:
‒ Auto: Thermostat selects heating or cooling as needed.
‒ Heat: Thermostat controls only the heating system.
‒ Cool: Thermostat controls only the cooling system.
‒ Em heat (only heat pumps with auxiliary heat): Thermostat controls auxiliary heat. Compressor
is not used. (Em heat on TH3210U model only.)
‒ Off: Heating and cooling system is off. Fan will still operate if fan is set to On.
NOTE: Heat On/Cool On may flash for 5 minutes due to compressor protection.
Fan operation settings
1. Press Menu, and then press the Fan (-)
button to cycle to the next available
Fan mode.
2. Cycle through the modes until the
required Fan mode is displayed, then
press Done.
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
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
When the low battery
warning appears, press
gently to loosen the
thermostat and then
carefully pull it from the
wall mount.
1. When the low battery warning appears, press gently to loosen the thermostat
and then carefully pull it from the wall mount.
2. Insert two AA alkaline batteries in the back of the thermostat as shown.

4
Alerts screen
1. You will see the alert icon and the
alert number on the screen.
2. Press Next (+) to see additional alerts,
if any. Then press Done to go back to
the home screen.
NOTE: If the alert is a critical alert,
you may not be able to access the
home screen and should call a HVAC
professional.
Number Alert/Reminder Definition
170 Internal Memory Error The memory of the thermostat has encountered an
error. Please replace the thermostat.
173 Thermostat
Temperature Sensor
Error
The sensor of the thermostat has encountered an
error. Please replace the thermostat.
405 Low Battery Alert The batteries are getting low. Replace them within
two months.
407 Critical Low Battery The batteries are almost depleted and should be
replaced as soon as possible.
Alerts codes

5
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank Make sure fresh AA alkaline batteries are properly installed (see
page 3).
Heating or cooling
system does not
respond
Press Menu and then Mode to set system to Heat. Make sure the
temperature is set higher than the Inside temperature.
Press Menu and then Mode to set system to Cool. Make sure the
temperature is set lower than the Inside temperature.
Check circuit breaker and reset if necessary.
Make sure power switch at heating & cooling system is on.
Make sure furnace door is closed securely.
Wait 5 minutes for the system to respond.
Heat On / Cool On
flashing on the screen
Compressor protection feature is engaged. Wait 5 minutes for
the system to restart safely, without damage to the compressor.
Troubleshooting
Electrical Ratings
Terminal Voltage (50 Hz/60 Hz) Running Current
WHeating 20 Vac - 30 Vac 0.02 A - 1.0 A
W2 (Aux) Heating (TH3210U only) 20 Vac - 30 Vac 0.02 A - 1.0 A
EEmergency Heat (TH3210U 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

6
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

7

Resideo Technologies Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
18004681502
3300521EFS03 M.S. Rev. 03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.
33-00521EFS-03
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.

Heat On
Menu
Fan Auto
TH3110U2008,
TH3210U2004
Lire avant l’installation
T3 Pro
Thermostat
Guide de l’utilisateur
La boîte comprend :
• Thermostat T3 Pro
• Système de montage UWP™
• Plaque décorative – petite;
120 mm H x 150 mm L
(4,72 po H x 5,9 po L)
• Vis et chevilles
• 2 piles AA
• Documentation du thermostat
Appelez le numéro gratuit du service à la clientèle en composant le 18004681502.
Service à la clientèle
Commandes du thermostat
Appuyez sur l’un des trois boutons pour réveiller l’écran. Si l’alimentation est obtenue avec le fil C, l’écran reste allumé
pendant 45 secondes une fois les modifications terminées. Si l’alimentation est obtenue par les piles, l’écran reste
allumé pendant 8 secondes. En fonction de l’installation du thermostat, l’écran peut rester allumé en permanence.
Lire avant l’installation
Heat On
Menu
Fan Auto
• Informations
d’état du système
Cool On
(Refroidissement)/
Heat On (Chauffage)/
Em Heat On
(Urgence), Compressor
Protection (Protection
du compresseur)
• Point de consigne
de température
intérieure
Appuyez sur les
boutons + ou - pour
modifier le réglage de
la température
• Température
intérieure actuelle
• Boutons de
navigation/
température
Appuyez pour
augmenter ou réduire
le point de consigne
ainsi que pour
naviguer dans le menu
et les options de menu
• Menu
Appuyez pour
afficher les options.
Commencez ici
pour configurer un
programme.

2
Réglages pour le fonctionnement du système
1. Appuyez sur le bouton Menu, puis sur le bouton
Mode (+) pour passer au prochain mode du système
accessible.
2. Parcourez les modes jusqu’à ce que vous tombiez
sur le mode du système voulu, puis appuyez sur
Done (terminé).
REMARQUE : Les modes de système disponibles
varient en fonction du modèle et des paramètres du
système.
Modes de système :
‒ Auto : Le thermostat choisit le chauffage ou le refroidissement selon le besoin.
‒ Heat (Chauffage) : Le thermostat commande uniquement le système de chauffage.
‒ Cool (Refroidissement) : Le thermostat commande uniquement le système de
refroidissent.
‒ Chauffage d’urgence (uniquement pour les thermopompes avec chauffage
auxiliaire) : Le thermostat commande le chauffage auxiliaire. Le compresseur n’est
pas utilisé. (Chauffage d’urgence uniquement sur le modèle TH3210U).
‒ Off (Arrêt) : Le système de chauffage et de refroidissement est arrêté. Le ventilateur
continue de fonctionner sil est réglé sur Marche.
REMARQUE : Les affichages Heat On (chauffage activé) ou Cool On (climatisation activée)
pourraient clignoter pendant 5 minutes en raison de la protection du compresseur.
Réglages pour le fonctionnement du ventilateur
1. Appuyez sur le bouton Menu, puis sur le bouton Fan
(+) (ventilateur) pour passer au prochain mode de
ventilateur.
2. Parcourez les modes jusqu’à ce que vous tombiez
sur le mode de ventilateur voulu, puis appuyez sur
Done (terminé).
REMARQUE : Les modes de ventilateur varient en
fonction des paramètres du système.
Modes du ventilateur :
‒ Auto : Le ventilateur fonctionne uniquement lorsque le système de chauffage ou de refroidissement est en
marche.
‒ On (Marche) : Le ventilateur est toujours activé.