Are there any clogs in the suction strainer?
Check pressure difference between in/out of strainer
Open strainer and check inside of the strainer
Rotating, but water does not come out. Discharge quantity is not enogh to specified capacity.
Over load (Overcurrent) occurs.
Excessive water leakage from stuffing box
Electric motor does not work well with noise.
Water comes out at first, but it doesn't come out soon.