You probably have a ductless system and have specified the ventilation at the Zone level of the Tree, Mechanical tab as coming from the HVAC system, but that type of system cannot provide ventilation. The typical error appears as:
“thermalzone ‘x’ has ‘forced’ ventilation, but the ventilationsystem for the thermalzone ‘x’ is not defined.”
At the Zone level of the tree, Mechanical tab, change the ventilation over to another choice (but not natural ventilation if it is a commercial occupancy)
← I am getting a Forced Ventilation error, how do I fix this?