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If by "status variable in the AFN" you mean "Availability Manager Hybrid Ventilation Control Status", then it sounds like EnergyPlus has decided that natural ventilation is allowed for the whole year. It's hard to say why that might be the case, but if that's not what you're expecting then you'll need to double check all hybrid ventilation manager inputs. You could also try one of the simpler control modes (e.g. Temperature control, option 1) and see if that behaves as you expect.