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TROUBLESHOOTING CHART
Symptom Possible Cause(s) Corrective Action
Little or no discharge 1. Casing not initially filled with water 1. Fill pump casing
2. Total head too high 2. Shorten suction lift and/or change head
3. Suction lift too high, or too long 3. Lower suction lift, install foot valve and prime,
or shorten length of suction line
4. Impeller plugged 4. Clean
5. Hole or air leak in suction line 5. Repair or replace; do not use Teflon tape; use
pipe sealing compound
6. Foot valve too small 6. Match foot valve to piping or install one size
larger foot valve.
7. Impeller damaged 7. Replace
8. Foot valve or suction line not submerged
deep enough in water
8. Submerge lower in water
9. Insufficient inlet pressure or suction head 9. Increase inlet pressure by adding more water
to tank or increasing back pressure
10. Suction piping too small 10. Increase to pump inlet size or one size larger
11. Motor wired incorrectly 11. Check wiring diagram
12. Casing gasket leaking 12. Replace
13. Suction or discharge line valves closed 13. Open
Pump will not deliver
water or develop
pressure
1. No priming water in casing 1. Fill pump casing
2. Mechanical seal is leaking 2. Replace (see Rotary Seal Replacement)
3. Leak in suction line 3. Repair or replace
4. Discharge line is closed and priming air has
nowhere to go
4. Open
5. Suction line (or valve) is closed 5. Open
6. Pump is down 6. Replace worn parts
7. Foot valve is leaking 7. Replace foot valve
8. Suction screen clogged 8. Clean or replace
Loss of suction 1. Air leak in suction line 1. Repair or replace
2. Suction lift too high 2. Lower suction lift, install foot valve and prime
3. Insufficient inlet pressure or suction head 3. Increase inlet pressure by adding more water
to tank or increasing back pressure
4. Clogged foot valve or strainer 4. Unclog
Pump vibrates and/
or makes excessive
noise
1. Mounting plate or foundation not rigid
enough
1. Reinforce
2. Foreign material in pump 2. Disassemble pump and clean
3. Impeller damaged 3. Replace
4. Worn motor bearings 4. Replace
5. Suction lift too high 5. Lower suction lift, install foot valve and prime
Pump will not start or
run
1. Improperly wired 1. Check wiring diagram on motor
2. Blown fuse or open circuit breaker 2. Replace fuse or close circuit breaker
3. Loose or broken wiring 3. Tighten connections, replace broken wiring
4. Stone or foreign object lodged in impeller 4. Disassemble pump and remove foreign object
5. Motor shorted out 5. Replace
6. Thermal overload has opened circuit 6. Allow unit to cool, restart after reason for
overload has been determined
Pumps leaks at shaft 1. Worn mechanical seal 1. Replace (see Rotary Seal Replacement)
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