1. First, please check the motor rotation direction before using. The rotation direction should be same as the mark shows on pump. Otherwise it might cause broken.
Please show us a picture of how you connect the wire inside the motor(in pump) before you starting it, I would deliver it to our engineer if it is right or not.

2. Please keep your eyes on the whirlpool process.
Once the whirlpool is almost formed, close the pump immediately,  in case more air going into pump and damaging the pump.
 
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