The answer to 'zone control system not heating' is that there are several common causes, including faulty zone dampers, issues with the thermostat or control panel, problems with the ductwork, or a malfunctioning zone control board. Symptoms may include some rooms not heating properly, the system short-cycling, or the thermostat not responding to temperature changes.
For minor issues, homeowners may be able to troubleshoot and fix the problem themselves, such as checking the thermostat batteries or clearing any blockages in the ductwork. However, for more complex problems like a faulty zone control board or issues with the HVAC system itself, it's best to call in a professional HVAC technician to diagnose and repair the issue.