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| TROUBLESHOOTING |
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| Table 8. Pump Troubleshooting | |
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SYMPTOM | POSSIBLE PROBLEM | SOLUTION |
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| Check that the proper voltage, 230 or 460 VAC, 60 |
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| Hz, |
| Incorrect voltage/amps? | check that there is an adequate amount of current |
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| (amps) to run the pump. Check power source circuit |
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| breaker. |
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| Check electrical connec- | If using fl oat switches check wiring, inspect power |
| tions? | cord. |
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| Blown power fuse or tripped | Replace fuse check circuit breaker, check cause of |
Pump Fails To Start | circuit breaker? | blown fuse or tripped breaker. |
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| Impeller locked? | Disconnect power cord and check for clogging. Un- |
| clog pump. Check overload protection device. | |
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| Use multimeter to check motor insulation. Insulation |
| Wet motor windings? | resistance must be approximately 15 megaohms. If |
| resistance is low, disassemble pump motor and bake | |
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| windings to dry them. |
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| Defective motor and pump | Check for excessive bearing wear, if worn replace |
| bearings? | bearings. Replace motor if defective. |
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| Twisted or restricted dis- | Lay hose fl at |
| charge hose? | |
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| Clogged pump strainer? | Clean strainer. |
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Pump Fails to Deliver Full |
| Use a voltmeter to check voltage while pump is |
Output |
| energized. Voltage must be within ±10%. Check |
| Low voltage? | power source (no load and load). If an extension cord |
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| is used, make sure it has adequate |
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| capacity for the required length.See Table 4. |
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| Impeller worn? | Replace impeller. |
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Water in Mechanical | Defective mechanical seal? | Replace mechanical seal. |
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Seal Oil | Loose Oil Fill Plug? | Tighten securely. Apply tefl on tape. |
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ST4125G/ST6125G SUBMERSIBLE PUMP• OPERATION MANUAL — REV. #0 (11/18/10) — PAGE 25
