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WaterGEMS Connection Run Fails

Hi Bentley Users,

I am running a watergem model with several pumps. As the below picture shows, the model fails at 7am which is the time pump #4 turns on. I've got an error mentions reversed flow for #1 on the right side, but it was able to continue and got normal pump head as the picture shows.

And controls for pump #4 as below:

If I am delay to booster pump #4 for one hour, it will solve the reversed issue. So any idea on why the reverse flow happens, and how may I avoide that?

Thanks,

Meng