| Fault | Reason | Solution |
| Pump does not suck water | There in no enough water enter into the pump | Open the air plug,fill water,excluding air in the pump,and then close the air lock |
| Input pipe air leakage or bottom valve water leakage | Checking the connection pars,sealing again and repairing the bottom value |
| There is air in pipe | Correct installing |
| Pressure gauge reaches a predetermined pressure,but water is shortage | Resistance of water outlet is loss much | Shorted water outlet pipe or expending the diameter of the pipe |
| The output height is more than pump capacity | Choose the new suitable pump |
| Less water | The air enter into the pump | Checking the leak place and seal it well |
| The radial clearance in impeller month is large,the water flow back the pump | Changing impeller |
| Bottom valve and pipe is blocked | Stop machine and check |
| The rate speed lower cases by the low voltage | Stable voltage power |
| Vibration or noisy | The unit is not securely mounted | Fasten the pump well |
| Suction pipe leaking or socked depth is not enough,which make the air enter the pump | Plug the leak place or lengthen depth of the suction pipe |
| Impeller produce NPSH | Installing height or enlarge the pipe’s diameter or increase the input pressure and change the impeller |
| Deviating from the real working condition | Adjusting the high efficiency(rated point)to run,avoiding the pump running under high flow rate condition |
| Motor heating | Environment temperature is high,motor heat dissipation is bad | Improve the working environment of the pump,checking the fan is well or not,ventilation is clogging or not |
| Motor is overload | Pump is stocked,stop it and check;Bearing is damaged,change the new bearing pump works under mass flow condition,adjust the pump’s rated point and high efficiency area to run |
| Voltage too high or too low or phase loss | Checking the electrical components,make the Voltage is stable |
| The water enter the motor | Disassemble the pump,drying it,prevent the water enter the motor |
| Water leakage | Sealing is damaged | Changing the sealing(shaft seal or O ring) |
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