How to Put DELLA into Test Mode: A Comprehensive Guide

In the world of HVAC systems, the ability to troubleshoot and test your equipment is crucial for ensuring optimal performance and longevity. When it comes to DELLA units, the process of putting the system into test mode is a valuable tool for technicians and DIY enthusiasts alike. This comprehensive guide will walk you through the step-by-step process of accessing the control panel, locating the test mode button, initiating the test mode, thoroughly testing the unit, and finally, exiting the test mode.

Accessing the Control Panel

The first step in putting your DELLA unit into test mode is to locate the control panel, which is typically found on the indoor unit. This panel houses the various buttons and controls that allow you to manage the system’s functions. Depending on the model of your DELLA unit, the control panel may be located in different areas, so it’s important to consult your user manual for specific instructions.

Identifying the Test Mode Button

how to put DELLA into test mode

Once you’ve accessed the control panel, the next step is to identify the button that will initiate the test mode. This button is often labeled as “Test” or “BS4” and may be located among other function buttons. It’s important to note that the placement and labeling of this button can vary between different DELLA models, so it’s crucial to carefully examine the control panel and refer to your user manual for guidance.

Entering Test Mode

To enter the test mode, you’ll need to hold down the “Test” or “BS4” button for approximately 5 seconds. This action will signal the DELLA unit to enter the test mode, and you should see an indication on the control panel or the unit itself that the test mode has been activated.

Testing the DELLA Unit

With the unit now in test mode, you can proceed to thoroughly test its various functions and settings. This includes running the unit in different modes, such as cooling and heating, and at various temperature settings. It’s recommended to test each mode for at least 8 minutes to ensure proper operation and to monitor any changes in pressure or error messages that may arise.

During the testing process, it’s crucial to pay close attention to the unit’s performance and any indicators that may suggest a problem. This includes monitoring the airflow, temperature, and any error codes or warning lights that may appear on the control panel or the unit itself.

Exiting Test Mode

Once you’ve completed the testing process, the final step is to exit the test mode. To do this, simply turn off the DELLA unit and then turn it back on. This action will signal the unit to exit the test mode and return to its normal operating mode.

It’s important to note that some DELLA units may require additional steps or have slightly different procedures for entering and exiting the test mode. Therefore, it’s always a good idea to consult your user manual for specific instructions related to your particular model.

Troubleshooting and Professional Assistance

If you encounter any issues or difficulties during the testing process, it’s important to take note of the specific problems and any error messages that may appear. In some cases, you may need to consult a professional HVAC technician for further assistance, especially if the issues persist or you’re unsure of how to proceed.


Putting your DELLA unit into test mode is a valuable tool for ensuring the proper operation and maintenance of your HVAC system. By following the step-by-step instructions outlined in this guide, you can confidently access the control panel, locate the test mode button, initiate the test mode, thoroughly test the unit, and exit the test mode with ease. Remember to always refer to your user manual for specific instructions related to your DELLA model, and don’t hesitate to seek professional assistance if you encounter any issues during the testing process.


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