Hello John, If no elements have controls (such as a pump control where it turns off at a certain tank elevation), simply delete the control. This is likely added accidentally at some point. The other issues are not really related to this. It was just that you couldn't compute the model with the validation error you were getting related to the controls. The main issue is the message about disconnected demand nodes and the network unbalanced error. These will need to be resolved before you have valid results.They are also likely related. This link has information on the disconnected demand nodes issue. This message means that some condition in your model, such as a pump being off or a tank being empty, is making it so that the demands in part of your model cannot be satisfied. There should be user notifications that will help identify the cause of the issue. You could also highlight a time step in the Calculation Summary (accessed by going to File > Summary or Analysis > Summary) to see the messages that occur at that time step. By resolving this issue, you will likely help with the Network Unbalanced issue. While it may help with the negative pressure issue too, this link has more information on that. The "Pressures below the lowest physically possible..." message indicates that the pressures at some nodes are below the vapor pressure. Checking elevations and headlosses may help with the negative pressures occurring in the system. If that doesn't help, we will need to see a copy of the model files to look into this. You can use this information to send the model files. Regards, Scott
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