At each Zone is an input for the Number of Floors which determines how many stories for this particular zone. So if a zone being modeled included both the second and third floors of a building, it would be set to two since that zone included two floors. Normally you would set this to one and model each floor as a zone. The CEC CBECC engine will not allow this number to be greater than 3, which means the zone you are modeling consists of all three floors of a building. While you might have a zone that exceeds 3 floors this particular input cannot be greater than 3.
To correct this, go to the Zone and change this number to no more than 3.
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