PEST will run your model multiple times. Sometimes during the testing of potential parameters, the model might not meet the convergence criteria but still reach an acceptable solution. If the model halts prematurely because of this, PEST may not be able to continue. There is an option in MODFLOW 6 to deal with just this situation. Select Model|MODFLOW Packages and Programs and go to the pane for the IMS solver. Check the “Continue even if no convergence” check box as illustrated below.
Screen capture illustrating the "Continue even if no convergence" option.
