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[EnergyPlus_Support] PlantLoop Temperature beyond control range


I have a model with simple plant settings: Boiler/Chiller/Cooling Tower. My temperature Setpoint is as listed below:
Boiler Loop
Hot water supply: 90°C
Hot water return: 60°C
Chilled Water Loop
Chilled water supply: 6°C
Chilled water return: 12°C
The node connections are all correct and air paths passed integrity testing. The bypass branch should works as well. However, the plant loop temperature goes out of control for some period (Like: Hot water return temperature is too low, or Chilled water return temperature is too high:
Plant loop falling below lower temperature limit, PlantLoop="HEAT_PLANTLOOP"
   *************  **   ~~~   **   This error occurred 3289 total times;
   *************  **   ~~~   **   during Warmup 6 times;
   *************  **   ~~~   **   during Sizing 0 times.
   *************  **   ~~~   **   Min=15.010066
Plant loop exceeding upper temperature limit, PlantLoop="CHILLED_PLANTLOOP"
   *************  **   ~~~   **   This error occurred 31592 total times;
   *************  **   ~~~   **   during Warmup 1177 times;
   *************  **   ~~~   **   during Sizing 0 times.
   *************  **   ~~~   **   Max=31.890885
Could anyone give me some clue about how to solve this problem, or which part might goes wrong. I attach for you the simple IDF file. The weather data is for Frankfurt, Germany. Thanks so much for the help.




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