Question-and-Answer Resource for the Building Energy Modeling Community
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That's not an integer comparison, MA is a one dimensional array of floating point numbers:
https://github.com/NREL/EnergyPlus/blob/develop/src/EnergyPlus/AirflowNetworkBalanceManager.hh#L93
This could be a bug, but I suspect that there is something about your network that is causing the problem. Incrementally connecting the network doesn't sound like a good idea to me. @Lixing Gu might be able to provide you with more information, but I'd try making sure that your network isn't unbalanced in some way.
