Question-and-Answer Resource for the Building Energy Modeling Community
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Since the error seems to be referring to a distribution component, you should first check to make sure all of the distribution nodes are connected together as intended. If your simplification from 13 to 3 zones left something hanging, then that could be the issue.
Without the model, it is hard to be certain what is going on, but this error usually means that the node that is reported is not properly connected to the rest of the network. It can be hard to track down, since the "disconnect" can be a consequence of other elements in your model. If your zones are not connected together, then I'd try connecting adjoining zones together (use cracks with a high resistance to flow if necessary) and see if that balances things out.
