The answer to 'zone control system blowing hot air' is that the most common causes are issues with the thermostat, dampers, or the HVAC system itself. Symptoms include some rooms being too hot while others are too cold, and the zone system not properly regulating the temperature. Solutions can include adjusting the thermostat settings, checking the dampers for proper operation, or having an HVAC technician inspect the system for any malfunctioning components.
If the issue is with the thermostat or dampers, you may be able to troubleshoot and fix it yourself. However, if the problem is with the HVAC equipment, it's best to call in a professional HVAC technician to diagnose and repair the issue to ensure proper and safe operation of the system.