MAINTENANCE
Troubleshooting
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232895 Rev. 001 02/23 Copyright © 2023, Franklin Electric, Co., Inc. All rights reserved.
7. Ensure the impeller eye is perpendicular to the adapter flange.
8. Ensure the impeller spins freely.
9. Place the square ring and diffuser on the volute.
10. Reposition the case gasket and bolt the volute to the motor adapter.
• Use Blue Loctite 243 on bolts.
• Torque to 20 ft-lbs.
Troubleshooting
Problem Probable Causes Corrective Action
Motor Fails to Start or
Not Running
Motor thermal protector tripped Correct cause for high amperage, such as low voltage or
excessive pumping.
Open circuit breaker or blown fuse Check electric wiring and motor for short circuits and correct.
Impeller binding Remove pump case and check for debris.
Motor improperly wired Check complete suction line and all fittings for air leaks and
verify foot valve has adequate submergence.
Defective motor Take to an authorized motor shop for repair or replacement.
Little or no discharge
Pump is not primed: air or gases in
pumpage
Check suction line and foot valve for leaks. Make sure that
water level has not dropped to uncover suction inlet. Prime
pump.
Discharge or suction plugged or valve
closed Clear obstructions from suction and discharge lines.
Low voltage or phase loss Correct incoming power to match motor nameplate require-
ments.
Impeller worn or plugged Clean or replace impeller.
System head too high Reduce system head (backpressure on pump) or resize pump.
Excessive suction lift or losses, or
NPSHA too low for the pump Locate pump closer to the water source, increase pipe size or
resize pump.
Low pump capacity
or pressure
Valves in suction or discharge lines
partially closed Open valves to reduce possible restrictions.
Suction or discharge line partially
plugged Clear obstructions from discharge line.
Wrong pump rotation Correct to proper rotation.
Excessive power
consumption
Impeller binding Remove pump case and check for debris.
Discharge head too low creating
excessive flow rate Close down discharge valve to increase pressure and throttle
back flow rate.
Fluid viscosity: specific gravity too
high Modify fluid properties or resize pump.
Excessive noise and
vibration
Impeller binding Remove pump case and check for debris.
Pump is not primed: air or gases in
pumpage Check complete suction line and all fittings for air leaks and
verify foot valve has adequate submergence.
Discharge or suction plugged or valve
closed Clear obstructions from suction and discharge lines.
Impeller worn or plugged Clean or replace impeller.
Excessive suction lift or losses. NPSHA
too low for the pump Locate pump closer to the water source, increase pipe size or
resize pump.
Discharge head too low, creating
excessive flow rate Close down discharge valve to increase pressure and throttle
back flow rate.
Worn bearing Check bearing for damage and replace if necessary.
Pump, motor, or piping loose Verify all connections and mountings are secure and piping
supported.
Water leakage at
pump shaft Defective seal assembly Replace seal.
