What Are The Common Faults And Troubleshooting Methods For Submersible Sewage Pumps

Apr 16, 2026

 

The electric pump suddenly stops running

reason

(1) Protection switch trips or fuse burns out
(2) Power outage or phase failure
(3) The outlet box of the submersible pump is filled with water, and the connecting wire is burnt out
(4) Stator winding burnt out

exclusion method

(1) Identify the specific cause of the tripping of the protective switch or the burning of the fuse, and then prescribe the right medicine to adjust and eliminate it
(2) Connect the wires

 

(3) Open the wire box, connect the broken wire package with insulation tape, eliminate the cause of water leakage in the outlet box, and assemble it as it is
(4) Re offline the stator winding for major repairs. In addition to timely replacement or maintenance of the stator winding, the root cause of the fault should also be identified and eliminated based on the specific situation

 

Stator winding burnt out

reason

(1) The grounding wire is incorrectly connected to the power cord
(2) When working with a broken phase, the current is much higher than the rated value, and the temperature rise of the winding is very high. Over time, it can cause insulation aging and damage to the stator winding
(3) Mechanical seal damage leads to water leakage, reducing the insulation resistance of the stator winding and damaging the winding
(4) The impeller is stuck, and the turtle pump is in a three-phase braking state. At this time, the current is about six times the rated current. If there is no switch protection, the winding will quickly burn out
(5) The end of the stator winding collides with the casing of the submersible water pump, resulting in ground breakdown
(6) The submersible pump starts and stops too frequently
(7) The dehydration operation time of the submersible pump is too long
 

exclusion method

(1) Correctly connect the grounding wire in the submersible pump cable to the grounding wire or temporary grounding wire of the power grid
(2) Promptly identify the cause, connect the disconnected power cord, or replace the cable
(3) Regularly check the insulation resistance of the submersible electric pump, and take timely measures to repair it when the insulation resistance decreases

 

(4) Take measures to prevent debris from entering the submersible pump and getting stuck in the impeller. Pay attention to checking the mechanical damage of the submersible pump to avoid the impeller getting stuck due to some kind of mechanical damage. At the same time, if the water pump suddenly stops flowing during operation, it should be shut down immediately for inspection and corresponding measures should be taken for maintenance
(5) When re embedding the winding, try to handle the two ends as well as remove the iron lumps on the inner surfaces of the upper and lower covers. During assembly, avoid the winding ends from touching the outer shell
(6) Do not turn on or off the electric pump too frequently to avoid overloading or unnecessary impact loads on the submersible pump. If it is necessary to restart the submersible pump, wait for the water in the pipeline to return before restarting
(7) During operation, close attention should be paid to the decrease in water level, and the electric pump should not be operated in the air for a long time (more than 1 minute) to avoid the submersible pump lacking heat dissipation and lubrication conditions