The answer to 'zone control system making noise' is that a noisy zone control system is usually caused by a problem with the dampers, motors, or other mechanical components. Common symptoms include rattling, whistling, or buzzing sounds coming from the vents or the control panel. The solutions can range from adjusting or lubricating the moving parts to replacing faulty components.
If the noise is mild and the system is still functioning properly, you may be able to address it with some basic DIY troubleshooting and maintenance. However, if the noise is persistent, disruptive, or accompanied by other issues like poor airflow or temperature imbalances, it's best to call in a professional HVAC technician to diagnose and repair the problem.