Mastering the Art of Overriding Carrier Thermostats: A Comprehensive Guide

Overriding a Carrier thermostat can be a complex task, but with the right knowledge and approach, you can take control of your HVAC system and ensure optimal comfort in your home or office. In this comprehensive guide, we’ll delve into the intricacies of overriding various Carrier thermostat models, providing you with a step-by-step playbook to navigate the process with confidence.

Unlocking the Carrier Comfort Series Thermostat

To override the Carrier Comfort Series Thermostat, follow these detailed steps:

  1. Press and hold the arrow buttons for approximately 5 seconds until the lock icon disappears from the display, indicating that the thermostat is now unlocked.
  2. Next, press and hold the mode and fan buttons for about 5 seconds until the display shows a series of chains.
  3. Navigate to setting number 21 and turn the thermostat off by pressing the mode button.
  4. Finally, press the fan button to complete the process, and the thermostat will now be unlocked and ready for manual override.

Overriding the Carrier Infinity Control

how to override Carrier thermostat

When dealing with the Carrier Infinity Control, the process of overriding the current program can be a bit more complex. Here’s what you need to know:

  1. If the thermostat won’t override the current program, it might be due to a system condition or a broken control. Carefully inspect the system for any issues.
  2. If the system is in “auto heat/cool” mode and you want to change the temperature, press the “up” button on the heating control.
  3. If the temperature jumps and then reverts to its previous setting, it could be due to high static pressure or another system-related problem. Consult a professional HVAC technician for further assistance.

Navigating the ZS Pro Zone Sensor

The ZS Pro zone sensor, which connects to Carrier’s Open DDC controllers, requires a different approach for overriding. Follow these steps:

  1. Determine if the zone sensor is currently operating in unoccupied mode. If so, press the power button to switch it to occupied mode.
  2. If you’re unable to adjust the setpoints, it’s likely because the manual override has been disabled. In this case, you’ll need to coordinate with your facility manager to make the necessary changes.

Overriding the Carrier Infinity Touch

The Carrier Infinity Touch thermostat offers a more user-friendly approach to overriding the scheduled settings. Here’s how to do it:

  1. Locate the “override” button on the touchscreen display.
  2. Press the “override” button to temporarily suspend the scheduled settings.
  3. Use the arrow buttons to adjust the temperature to your desired level.
  4. Once you’re satisfied with the temperature, press the “resume schedule” button to return to the normal programmed settings.

Important Considerations

It’s crucial to remember that overriding a Carrier thermostat should be done with caution to avoid potential damage to the HVAC system or causing discomfort. If you’re unsure about the specific steps for your Carrier thermostat model, always refer to the user manual or consult a professional HVAC technician for guidance.


Mastering the art of overriding Carrier thermostats requires a deep understanding of the various models and their unique features. By following the detailed steps outlined in this comprehensive guide, you’ll be well on your way to taking control of your HVAC system and ensuring optimal comfort in your living or working space. Remember to always prioritize safety and consult with professionals when necessary to ensure the long-term health and efficiency of your Carrier thermostat.


  1. Carrier Comfort Series Thermostat Unlock Procedure
  2. Carrier Infinity Control Override Issues
  3. Carrier ZS Pro Zone Sensor Troubleshooting
  4. Carrier Infinity Touch Thermostat Override