Zonal type systems such as Packaged DX, Split DX, Water Source Heat Pumps, Packaged Terminal Air Conditioners and Heat Pumps and Four Pipe fan Coil systems cannot be configured to serve more than one HVAC zone given the limitation of the thermostat controls. The CEC CBECC engine enforces this rule.
At the Zone level of the tree, make sure the system only has one Zone in the tree below the System, or choose a different system type designed to serve more than one Zone.
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