I get the error "Network Unbalanced" for my model. I checked the validation of my model and no error was found. None of the "common causes" match my model either. However, my flow seems to converge to a value for all the other time steps (see below). Can I assume this value (1,547.34) is correct? And how can I ask the system to show another time step than hour 0 in the properties?
First try increasing the number of trials which can be found in the calculation options.
If that doesn't help, here is a Wiki article that may provide a solution - Troubleshooting the Network Unbalanced or Cannot solve network hydraulic equations user notification.
Please let us know if that does not answer your questions.