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Troubleshooting
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
Motor thermal protector tripped
Open circuit breaker or blown fuse
Motor Fails to Start or
Impeller binding
Not Running
Motor improperly wired
Defective motor
Pump is not primed: air or gases in
pumpage
Discharge or suction plugged or valve
closed
Little or no discharge
Low voltage or phase loss
Impeller worn or plugged
System head too high
Excessive suction lift or losses, or
NPSHA too low for the pump
Valves in suction or discharge lines
partially closed
Low pump capacity
Suction or discharge line partially
or pressure
plugged
Wrong pump rotation
Impeller binding
Discharge head too low creating
Excessive power
excessive flow rate
consumption
Fluid viscosity: specific gravity too
high
Impeller binding
Pump is not primed: air or gases in
pumpage
Discharge or suction plugged or valve
closed
Impeller worn or plugged
Excessive noise and
Excessive suction lift or losses. NPSHA
vibration
too low for the pump
Discharge head too low, creating
excessive flow rate
Worn bearing
Pump, motor, or piping loose
Water leakage at
Defective seal assembly
pump shaft
For technical assistance, parts, or repair, please contact:
888.885.9254 | redlionproducts.com
232895 Rev. 001 02/23
Probable Causes
Corrective Action
Correct cause for high amperage, such as low voltage or
excessive pumping.
Check electric wiring and motor for short circuits and correct.
Remove pump case and check for debris.
Check complete suction line and all fittings for air leaks and
verify foot valve has adequate submergence.
Take to an authorized motor shop for repair or replacement.
Check suction line and foot valve for leaks. Make sure that
water level has not dropped to uncover suction inlet. Prime
pump.
Clear obstructions from suction and discharge lines.
Correct incoming power to match motor nameplate require-
ments.
Clean or replace impeller.
Reduce system head (backpressure on pump) or resize pump.
Locate pump closer to the water source, increase pipe size or
resize pump.
Open valves to reduce possible restrictions.
Clear obstructions from discharge line.
Correct to proper rotation.
Remove pump case and check for debris.
Close down discharge valve to increase pressure and throttle
back flow rate.
Modify fluid properties or resize pump.
Remove pump case and check for debris.
Check complete suction line and all fittings for air leaks and
verify foot valve has adequate submergence.
Clear obstructions from suction and discharge lines.
Clean or replace impeller.
Locate pump closer to the water source, increase pipe size or
resize pump.
Close down discharge valve to increase pressure and throttle
back flow rate.
Check bearing for damage and replace if necessary.
Verify all connections and mountings are secure and piping
supported.
Replace seal.
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