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[EnergyPlus_Support] Plant loop flow rate autosized to a negative number

What does it mean when a plant loop flow rate is autosized to a negative number? What should be the very origin of that problem, so I can fix it?

Thanks!


Error messages afterm simulation:

** Warning ** SizePlantLoop: Calculated Plant Sizing Design Volume Flow Rate=[-99998.49] is too small. Set to 0.0
   **   ~~~   ** ..occurs for PlantLoop=CIRCUITO AGUA CHILLED WATER LOOP
   ** Warning ** SizePump: Calculated Pump Nominal Volume Flow Rate=
[-99998.49] is too small. Set to 0.0
   **   ~~~   ** ..occurs for Pump=CIRCUITO AGUA CHW SECONDARY PUMP



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