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  1. Verify if you see error messages during design computations. If so, fix them before doing the simulation.
  2. Verify the error messages and see if you can change your model based on the error message and its suggestions
  3. If you use ILS components, please verify following page : Imposed Load Simulation (ILS) error codes and common mistakes
  4. If your model has a pump with a 'proportional head' mode, please check if you can run the simulation in 'constant speed' of 'constant head' mode
  5. If your model contains PICV's (Pressure Independent Control Valve) or DPCV's, please try the following :
    1. Set "enable PI P-Control simplification" of the DPCV to false
      if you have locked the primary design pressure, you might need to tune the proportional band and repeat time
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    2. change the valve type of the control valve behind the DPCV from equiprocentual to linear
    3. add randomness on the setpoint profiles of the rooms
    4. enable the 'smoothen DPCV lift curve' parameter
    5. raise the SVO value to 100 (smoothens the lift curve)) of the control valve behind the DPCV
    6. <not advised> In the 'setting overrides', go to the 'Expert Settings' tab and higher the Iteration target
  6. Please contact Hysopt (support@hysopt.com)

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