How to solve? Calculation Warnings "Maximum trials exceeded. System may be unstable."

Hello Ajaykumar, 

This error notification means that there are multiple data entry issues with the model, which you need to resolve to make the model results stable. 

First double click on the user notification, which will zoom in to the element having issues with, upon reading notification you will understand problem associated with elemtent, which you need to rectify and resolve. 

It could be pipes with zero flows making model unstable, controls not working etc. 

Please see below wiki's for reference. 

"Network Unbalanced" problems with zero flow/ static conditions

Troubleshooting the Network Unbalanced or Cannot solve network hydraulic equations user notification

If this doesn't help then you could upload model files for our review. 

Sharing model files

Hello Ajaykumar, 

This error notification means that there are multiple data entry issues with the model, which you need to resolve to make the model results stable. 

First double click on the user notification, which will zoom in to the element having issues with, upon reading notification you will understand problem associated with elemtent, which you need to rectify and resolve. 

It could be pipes with zero flows making model unstable, controls not working etc. 

Please see below wiki's for reference. 

"Network Unbalanced" problems with zero flow/ static conditions

Troubleshooting the Network Unbalanced or Cannot solve network hydraulic equations user notification

If this doesn't help then you could upload model files for our review. 

Sharing model files