Troubleshooting Chart
Symptom | Possible Cause(s) | Corrective Action |
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Pump will not start or run | 1. Water level too low | 1. | Pump switch will not turn on unless water covers top of pump |
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| 2. | Blown fuse or tripped circuit breaker | 2. | If blown, replace with proper sized fuse or reset breaker |
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| 3. | Low line voltage | 3. | If voltage is under recommended minimum, check wiring size from |
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| the main switch on property. If OK, contact power company. |
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| 4. | Defective motor | 4. | Return for service |
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| 5. | Defective float switch | 5. | Replace float switch |
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| 6. | Impeller (pump filled with debris) | 6. | If impeller will not turn, remove housing and remove debris |
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| 7. | Tangled switch | 7. | Arrange switch so the switch moves freely. Reposition pump if |
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| necessary |
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| 8. | Insufficient liquid level | 8. | Make sure liquid level is at least 13" from the basin floor |
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Pump starts and stops too | 1. Backflow of water from piping | 1. | Install check valve |
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often | 2. Faulty float switch | 2. | Replace float switch |
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| 3. | Check valve not installed or leaking | 3. | Remove and examine check valve for proper installation and free |
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| operation |
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| 4. | Discharge head is less than | 4. | Recheck all sizing calculations to determine proper pump size |
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| manufacturer's minimum |
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Pump shuts off and turns on independently of switch (trips thermal overload protection)
1. | Excessive water temperature | 1. | Pump should not be used for water above 120° | ||
2. | Defective switch or entangled switch | 2. | Replace or reposition pump | ||
| is causing pump to run dry |
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| Pump may start unexpectedly. Disconnect |
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| power supply before servicing |
3. | Low line voltage | 3. | If voltage is under recommended minimum, check wiring size from | ||
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| the main switch on property. If OK, contact power company | |
| Pump operates noisily or | 1. Worn bearings | 1. | Return for service or replace | ||
| vibrates excessively | 2. Debris in impeller cavity | 2. | Remove housing, clean impeller | ||
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| 3. | Piping attachments to building | 3. | Replace portion of discharge pipe with flexible connector | |
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| structure too rigid or too loose |
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| Pump will not shut off | 1. Defective float switch | 1. | Replace float switch | ||
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| 2. | Float switch movement restricted | 2. | Reposition pump or clean basin as required to provide adequate | |
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| clearance for float | |
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| 3. | Restricted discharge (obstruction in | 3. | Remove pump and clean pump & piping | |
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| piping) |
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| 4. | Excessive inflow or pump not | 4. | Recheck all sizing calculation to determine proper pump size | |
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| properly sized for application |
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| Pump operates but | 1. Low line voltage | 1. | If voltage is under recommended minimum, check wiring size from | ||
| delivers little or no water |
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| the main switch on property. If OK, contact power company | |
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| 2. | Debris caught in impeller or discharge | 2. | Remove, clean and check for tightness | |
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| 3. | Worn or defective pump parts or | 3. | Replace entire pump. Clean parts if required | |
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| plugged impeller |
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| 4. | Pump running backwards | 4. | Check rotation. (CCW from bottom) Return if CW | |
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| 5. | Pump not properly sized for application | 5. | Recheck all sizing calculations to determine proper pump size | |
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| 6. | Check valve stuck closed or installed | 6. | Remove and examine check valve for proper installation and free | |
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| backwards |
| operation | |
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| 7. | Shut off valve closed | 7. | Open valve | |
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