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