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I. Possible reasons for insufficient vacuum pump performance: Insufficient power supply to the motor, resulting in low rotation speed； Insufficient water supply ； The gap between the impeller and the distribution plate is too large ； Damage to the mechanical seal causes leakage of water and air ； The impeller is excessively worn ； The circulating water cannot be discharged. Exclusion method: Check whether the supply voltage is within the motor’s rated voltage range ； Increase the water supply volume (it must be kept within the correct range; otherwise, the motor will overheat due to overload) ； Reduce the gap between the impeller and the distribution plate (usually 0.15–0.20 mm) ； Replace the mechanical seal ； Replace the impeller ； Check the pipeline at the outlet. II. Possible reasons for failure to start or excessive noise when starting: Insufficient power supply voltage to the motor ； Motor operating with a missing phase ； The pump has rusted due to long-term disuse ； Foreign objects drawn into the pump ； Impeller drag distribution plate. Exclusion method: Check whether the supply voltage is too low ； Check that all motor connections are secure ； If the pump has rusted due to long-term disuse, some rust remover can be added, or the pump cover can be opened to manually remove the rust ； Open the pump cover to remove debris ； Adjust the distance between the impeller and the distribution plate. III. Motor overheating – Possible cause: Excessive water supply leading to motor overload ； Motor phase loss ； Exhaust vent blocked ； The impeller drives other components. Exclusion method: Reduce the water supply volume to the normal range (refer to the water supply volume specified in the pump’s instruction manual) ； Check whether the wiring is secure ； Check the exhaust outlet ； Open the pump cover to adjust the clearance between the impeller and other components.