The answer to 'why is my zone control system not working' is that there could be several common causes, including issues with the thermostat, wiring, or the zone control panel itself. Symptoms may include uneven heating/cooling, rooms not responding to temperature changes, or the system not turning on at all.
Some potential solutions include checking the thermostat batteries, inspecting the wiring for any loose or damaged connections, and ensuring the zone control panel is receiving power. If the issue persists, it's best to call in an HVAC professional who can properly diagnose and repair the problem.