Dispatched for a thermostat displaying a blank white screen and no system response. A thorough diagnostic of the entire HVAC system was performed, including verification of power, low-voltage wiring, control board communication, and overall system operation. The diagnosis confirmed the thermostat has failed internally and is no longer operational. This equipment utilizes a communicating HVAC system, which requires a manufacturer-specific communicating thermostat to function correctly. Standard or non-communicating thermostats are not compatible with this system. Replacement with the correct brand-specific thermostat is required to restore proper operation. Thank you for allowing us into your home to diagnose your system. We truly appreciate the opportunity to serve you and provide reliable, family-focused comfort solutions. Please don’t hesitate to reach out with any questions.