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General| Model | T4 Pro |
|---|---|
| Programmable | Yes |
| Stages | 1 Heat/1 Cool |
| Compatibility | Conventional and Heat Pump systems |
| Operating Modes | Heat, Cool, Off |
| Fan Modes | Auto, On |
| Temperature Range (Heat) | 40°F to 90°F |
| Temperature Range (Cool) | 50°F to 99°F |
| Wi-Fi Capable | No |
| Display | Digital |
| Power Source | Battery or Hardwired |
| Programmability | 7-day |
| Terminal Designations | R, C, W, Y, G, O/B |
| Power | 24VAC |
| Warranty | 5-year limited |
| Temperature Range | 40°F to 99°F |
Essential safety and operational information to review before proceeding with thermostat installation and setup.
Guide to configuring the thermostat's system modes (Heat, Cool, Auto, Off) and fan settings for optimal performance.
Details on how to set and adjust the fan operation modes, including automatic and continuous fan settings.
Instructions for accurately setting the current time and date on the programmable thermostat.
Explanation of programmable schedules, including four daily time periods and recommended energy-saving settings.
How to temporarily adjust the setpoint temperature, overriding the programmed schedule until the next period.
Instructions for setting a permanent hold on the thermostat's temperature, overriding all programmed schedules.
Guide to switching the thermostat display between Fahrenheit and Celsius temperature units.
How to enable or disable keypad lockout, including setting a password for security or preventing unintended changes.
Instructions for modifying the display backlight brightness level for better visibility.
Information on the low battery indicator, its meaning, and when to replace batteries.
How to manage the air filter replacement reminder, including snoozing or clearing the alert.
Steps to resolve issues where the thermostat display is not showing any information.
Solutions for when the thermostat fails to activate the heating or cooling system.
Troubleshooting tips for when the thermostat does not adjust to the desired temperature settings.
Explanation for the 'Heat On' or 'Cool On' flashing indicator, related to compressor protection.
Detailed electrical specifications including terminal voltage and running current for system compatibility.
Information regarding the product's limited warranty coverage and where to find further details.
Important warnings related to electrical hazards, equipment damage, mercury, and electronic waste disposal.
Links and citations to external resources for further product information and support.
List of other Honeywell Home thermostat manuals and guides for related models.
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