TROUBLESHOOTING
Problem
Possible Cause
Little or no
discharge
Pump will not
deliver water or
develop pressure
Loss of suction
Pump vibrates
1. Mounting plate or foundation not rigid
and/or makes
excessive noise
2. Foreign material in pump
3. Impeller damaged
4. Worn motor bearings
Pump will not start
1. Improperly wired
or run
2. Blown fuse or open circuit breaker
3. Loose or broken wiring
4. Stone or foreign object lodged in
5. Motor shorted out
6. Thermal overload has opened circuit
1. Casing not initially filled with water
2. Suction lift too high, or too long
3. Hole or air leak in suction line
4. Foot valve too small
5. Foot valve or suction line not
submerged deep enough in water
6. Motor wired incorrectly
7. Casing gasket leaking
8. Suction or discharge line valves
closed
1. No priming water in casing
2. Leak in suction line
3. Discharge line is closed and priming
air has nowhere to go
4. Suction line (or valve) is closed
5. Foot valve is leaking
6. Suction screen clogged
1. Air leak in suction line
2. Suction lift too high
3. Insufficient inlet pressure or suction
head
4. Clogged foot valve or strainer
enough
impeller
Corrective Action
1. Fill pump casing
2. Move pump closer to water source
3. Repair or replace. Use Teflon
pipe sealing compound
4. Match foot valve to piping or install one
size larger foot valve.
5. Submerge lower in water
6. Check wiring diagram
7. Replace
8. Open
1. Fill pump casing
2. Repair or replace
3. Open ball valve
4. Open
5. Replace foot valve
6. Clean or replace
1. Repair or replace
2. Lower suction lift, install foot valve and
prime
3. Increase inlet pressure by adding more
water to tank or increasing back pressure
4. Unclog
1. Reinforce
2. Disassemble pump and clean
3. Replace
4. Replace
1. Check wiring diagram on motor
2. Replace fuse or close circuit breaker
3. Tighten connections, replace broken wiring
4. Disassemble pump and remove foreign
object
5. Replace
6. Allow unit to cool, restart after reason for
overload has been determined
15
tape and
®