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Honeywell Home T3 Pro - User Manual

Honeywell Home T3 Pro
24 pages
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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800468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.

Table of Contents

Other manuals for Honeywell Home T3 Pro

Preview: Installation Instructions
Installation Instructions36 pages

Questions and Answers

  • J
    Jason BennettJul 28, 2025
    What to do if Honeywell Home T3 Pro heating system does not respond?
    • M
      Michael PerezJul 29, 2025
      If your Honeywell Home Thermostat isn't responding when you try to heat your home, first press the Menu button, then Mode, and set the system to Heat. Ensure that the set temperature is higher than the current inside temperature. Also, check that the circuit breaker hasn't tripped and reset it if needed. Finally, confirm that the power switch for your heating and cooling system is turned on and that the furnace door is securely closed. Allow 5 minutes for the system to respond.
  • R
    Rachel RoseAug 7, 2025
    What to do if Honeywell Home T3 Pro cooling system does not respond?
    • M
      Michelle PageAug 7, 2025
      If your Honeywell Home Thermostat isn't responding when you try to cool your home, first press the Menu button, then Mode, and set the system to Cool. Ensure that the set temperature is lower than the current inside temperature. Also, check that the circuit breaker hasn't tripped and reset it if needed. Finally, confirm that the power switch for your heating and cooling system is turned on and that the furnace door is securely closed. Allow 5 minutes for the system to respond.
  • V
    vyoungAug 17, 2025
    How to fix a blank display on Honeywell Home T3 Pro?
    • M
      Marissa MartinezAug 17, 2025
      If the display on your Honeywell Home Thermostat is blank, make sure that you have properly installed fresh AA alkaline batteries.

Summary

Read Before Installing

Thermostat Controls Overview

Details the physical buttons and display elements for thermostat operation.

Customer Assistance

System Operation Settings

Changing System Mode

Steps and options for selecting heating, cooling, auto, or off system modes.

Fan Operation Settings

Changing Fan Mode

Instructions for setting the fan to Auto or On operation.

Battery Replacement

Battery Replacement Procedure

Step-by-step guide for removing the thermostat and inserting new batteries.

Alerts Screen

Alert Codes and Definitions

Defines common alert numbers, their reminders, and meanings for troubleshooting.

Troubleshooting

Common Troubleshooting Steps

Solutions for common issues like blank display, unresponsive systems, and flashing indicators.

Electrical Ratings

Technical specifications for terminal voltage and running current.

5-Year Limited Warranty

Honeywell Home T3 Pro Specifications

General IconGeneral
TypeProgrammable Thermostat
Wi-Fi ConnectivityYes
GeofencingYes
Warranty1-year limited warranty
CompatibilityHVAC systems including gas, electric, oil, and heat pumps
DisplayColor touchscreen
Battery BackupYes
Temperature Range40°F to 99°F
Schedule7-day scheduling
Power SourceHardwired
StagesUp to 2 heating and 2 cooling stages
ConnectivityWi-Fi
Remote ControlYes (via app)
InstallationDIY installation or professional installation

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