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Troubleshooting
Problem
Cause
Pump's ca-
1. Wrong pump rotation (if no built in supply control relay)
pacity is too
2. Pump not enough submersed
low
3. Total head of application does't match pump performance
4. Impeller not rotating free
5. Delivery hose is squeezed
6. Strainer is blocked
7. Impeller is worn
Pump
1. Wrong phase sequence (with built in supply control relay)
doesn't start
2. Fuse blown or circuit breaker tripped
3. Damaged cable
4. Power failure
5. Impeller not rotating free
6. Float switch is defective or not adjusted correctly
7. Failure of thermal switch
Action
1. Correct the phase sequence by shifting two out of three phases and start the pump again
2. Lower pump level or increase water level
3. Adjust pump performance or change to another pump
4. Clean system or adjust impeller properly
5. Straighten delivery hose
6. Clean strainer
7. Retrim or replace impeller
1. Shift two out of three phases and start the pump again
2. Measure stator and pump cable, replace if damaged
Check electric system for moisture or water ingress, replace seals if necessary
Check cable for damaged jacket
3. Replace cable, use new cable seal
4. Restore power supply
5. Clean system or adjust impeller properly
6. Check float switch adjustment
7. Identify failed thermal switch and bypass it according to separate section in this AIB
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