How to Reset DELLA One Thermostat: A Comprehensive Guide


Resetting a DELLA One thermostat can be a crucial step in troubleshooting issues with your heating and cooling system. This comprehensive guide will walk you through the step-by-step process of resetting your DELLA One thermostat, including detailed instructions, technical specifications, and expert-level insights to ensure a successful reset.

Preparing for the Reset

how to reset DELLA one thermostat

Before you begin the reset process, it’s essential to gather the necessary tools and information. You’ll need:

  1. A Phillips screwdriver (for removing the thermostat cover, if necessary)
  2. The user manual for your specific DELLA One thermostat model
  3. Knowledge of the circuit breaker location that controls the outdoor unit

Turning Off the Power

  1. Locate the circuit breaker: Identify the circuit breaker that controls the outdoor unit of your DELLA One heating and cooling system.
  2. Turn off the circuit breaker: Flip the circuit breaker to the “Off” position, cutting power to the outdoor unit.
  3. Wait for at least 2 minutes: Allow the system to fully discharge and reset by waiting a minimum of 2 minutes with the power turned off.

Resetting the Thermostat

  1. Turn off the thermostat: Using the remote control, turn off the DELLA One thermostat.
  2. Remove the thermostat cover: If necessary, use a Phillips screwdriver to remove the thermostat cover, providing access to the internal components.
  3. Locate the reset button: Consult your DELLA One thermostat user manual to identify the location of the reset button, which is typically a small, recessed button on the circuit board.
  4. Press and hold the reset button: Using a small, non-metallic object (such as a toothpick or a pen cap), press and hold the reset button for 5-10 seconds.
  5. Release the reset button: Once the 5-10 seconds have elapsed, release the reset button.

Restoring Power and Verifying the Reset

  1. Turn the circuit breaker back on: Flip the circuit breaker that controls the outdoor unit to the “On” position, restoring power to the system.
  2. Wait for the system to initialize: It may take 3 or more minutes for the DELLA One thermostat and the connected heating and cooling system to fully initialize and begin operating again.
  3. Verify the reset: Check the thermostat display to ensure that the settings have been reset to the factory defaults. You may need to reconfigure your preferred temperature settings and other preferences.

Troubleshooting and Additional Considerations

  • If the reset process does not work as expected, refer to the DELLA One thermostat user manual for additional troubleshooting steps or contact DELLA customer support for further assistance.
  • Resetting the thermostat should be a last resort when troubleshooting issues. Before resetting, try basic troubleshooting steps, such as checking the batteries, ensuring the thermostat is set to the correct mode and temperature, and verifying that the system is receiving power.
  • Depending on the firmware version and model of your DELLA One thermostat, the specific reset process may vary slightly. Always consult the user manual or contact DELLA support for the most accurate and up-to-date information.


Resetting a DELLA One thermostat can be a valuable troubleshooting step, but it’s important to approach the process with care and attention to detail. By following the comprehensive guide outlined in this article, you can successfully reset your DELLA One thermostat and get your heating and cooling system back on track.


  1. Resetting Your Ductless Heat Pump – YouTube
  2. HONEYWELL Home T4 Pro | HOW to Use MANUAL Override – YouTube
  3. How Do I Reset My Honeywell Home Device? – Honeywell Home
  4. Thermostat Reset – YouTube
  5. How Do You Reset Your Daikin Thermostat? – Advantage Heating & Cooling