Common Faults And Troubleshooting Methods Of Submersible Sewage Pumps
Apr 15, 2026
1. No water comes out after startup
Root cause analysis:
(1) Impeller stuck
(2) The power supply voltage is too low
(3) Power outage or phase failure
(4) Cable breakage
(5) Damaged plug
(6) The voltage drop of the cable is too high
(7) The stator winding is damaged; Serious imbalance of resistance; One or both phases are broken; The insulation resistance to ground is zero
Exclusion method:
(1) Remove debris and manually rotate the impeller to see if it can rotate. If the end face of the impeller is found to be rubbing against the mouth ring, a gasket must be used to elevate the impeller slightly
(2) Switch to high head water pumps or reduce the head of electric pumps
(3) Step by step check the fuse and switch parts of the power supply, identify and eliminate faults; Check if the contacts of the three-phase temperature relay are connected and make them work properly
(4) Identify the breakpoint and connect the cable properly
(5) Replace or repair the plug
(6) Select the appropriate cable specifications based on the length of the cable, increase the conductive area of the cable, and reduce the voltage drop of the cable
(7) Re offline the stator winding for major repairs, so that it can be rewound according to the original design data
2. Insufficient water output
Root cause analysis:
(1) Head too high
(2) Filter blockage
(3) Blockage in the impeller flow section
(4) The impeller is not turning correctly
(5) Wear of impeller or mouth ring
(6) The diving depth of the submersible pump is not sufficient
(7) The power supply voltage is too low
Exclusion method:
(1) Choose the pump model or reduce the head height according to the actual required head height
(2) Remove water plants and other debris around the grille of the submersible pump
(3) Disassemble the pump part of the submersible pump and remove debris
(4) Connect any two non grounding wires of the power cord for replacement
(5) Replace the impeller or mouth ring
(6) Deepen the diving depth of the submersible pump
(7) Reduce head