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INSTRUCTION MANUAL
7. Troubleshooting
Symptoms
Pump fails to
start
Pump fails to
function
despite motor
operation
Insufficient
capacity
Excessive
current
Vibration
and/or noise
PM32U
Probable Causes
o Defective cable or motor.
o Malfunction inside control panel.
o Power source trouble.
o Pump is mechanically locked.
o Defective protector.
o System head too high.
o Clogged discharge pipe
(Pressure too high).
o Clogged pump or strainer
(Pressure too low).
o Wrong direction rotation.
o Internal pump wear.
o Valve is closed.
o Air suction.
o System head too high.
o Clogged discharge pipe.
(Pressure too high)
o Clogged pump or strainer.
(Pressure too low)
o Air accumulation in pipe.
o Internal pump wear.
o Wrong direction rotation.
o Liquid viscosity different from
design value.
o Damaged impeller.
o Gravity of pumped liquid greater
than that specified.
o Sand mixed with water.
o Refer to "Pump fails to start"
o Internal pump wear.
o Clogged pump.
o Cavitation or vortex.
o Resonance in pipe line or
foundation.
o Rotating component in contact
with fixed component.
o Damaged impeller.
Remedies
o Lifts pump and replace cable or motor.
o Inspection made by competent
electrician.
o Inspection made by competent
electrician.
o Lift pump, inspect and/or overhaul.
o Replace protector.
o Recheck requirements.
o Clean discharge pipe.
o Clean strainer or impeller and casing.
o Check and change rotation.
Transpose two of three phase leads at
panel.
o Repair and/or replace.
o Check valve operation.
o Raise water level in pump pit.
o Recheck requirements.
o Clean discharge pipe.
o Clean strainer, impeller and bowl.
o Install air vent valve.
o Repair and/or replace.
o Check and change rotation. Transpose
two of the three phase leads at panel.
o Recheck requirements.
o Repair and/or replace
o Change pump unit.
o Lift the pump and overhaul. Remove
sand in tank.
o Repair and/or replace.
o Clean pump.
o Raise suction water level. Operate at
proper flow rate.
o Repair to change characteristic
vibration.
o Internal pump check.
Repair and/or replace.
o Repair and/or replace.
P.38
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