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DISPLAYED FAULT
CAUSE
System
undersized
System dirty
Water level
too low
Incorrect rotational
direction
THE PUMP WORKS
(three-phase only)
with a reduced
rate
Incorrect supply
voltage
Leaks from piping
Pressure too high
Supply voltage out-
side motor's accepted
range
Inadequate thermal
cutout setting
Motor overload due to
dense and/or viscous
liquid
PUMP STOPS
AFTER
RUNNING FOR
SHORT TIME
as a result of
Pump delivers liquid
thermal
at higher rate than
overload
protection tripping
rating plate
Panel exposed to
sun or other sources
of heat
Foreign matter
blocking impeller
rotation
Motor bearings worn
THE PUMP STOPS
Liquid temperature
too high
AFTER WORKING
FOR BRIEF
PERIODS
Thermal protection
intervention
Internal fault
EBARA
www.pumpsebara.com
SOLUTION
Ensure that pump is
sized for the application
Clean the piping, val-
FOR BRIEF PERIODS
Switch off the pump
or immerse the foot
valve
Swap two of the line
phases
Supply the pump with
the voltage indicated
on the nameplate
Check the joints
Recheck the system
Check whether there
are excessive drops in
voltage due to under-
sized line or cables
Adjust setting to
motor's rated current
Circuit breaker
(see rating plate)
throttling the discharge
line or replace motor
with more powerful
one
- Check actual power
absorbed by the
pump based on liquid
circuit breaker trips
pumped
throttling discharge line
site direction when
Protect panel from
sun or
sources of heat.
- Disassemble and
clean pump
- Call our nearest
Servicing Department
to do the job
- Replace bearings
- In this case, motor
Pump vibrates and is
is noisy, too
The temperature
exceeds the
technical limits of the
pump
Contact the nearest
authorized distributor or
service center
Pumps Americas Corporation
DISPLAYED FAULT
CAUSE
THE PUMP STOPS
The difference
AFTER WORKING
between
maximum and mi-
Pressure
nimum pressure is
minimal
applications
THE PUMP DOES
NOT STOP
Maximum
Pressure applica-
pressure too high
tions
Flow rate too high
Cavitation
Piping not secured
THE PUMP
VIBRATES
Noisy bearing
Or is too noisy du -
ring operation
Debris contacting
the motor fan
Incorrect priming
Motor
short-circuited
trips or fuses
blow when
starting pump
Short-circuit due to
incorrect connection
Leakage current caused
GFCI current
by damaged insulation
of motor, cables or
as soon as switch
other electric com-
closes
ponents
Pump performs a
Foot valve leaking
few turns in oppo-
Suction pipe leaking
stopping
Motor bearings worn
Foreign matter betwe-
parts
unusually noisy
Pump operation
affected by cavitation
SOLUTION
Increase the differen-
ce between the two
pressures
Set maximum
pressure at a
lower value
Contact the nearest
retailer
Secure piping
Contact the nearest
authorized distributor or
service center
Remove debris
Prime the pump and/
Check and replace
Check and reconnect
correctly
Check and replace
electric component
with ground fault
Check, clean or replace
Check and repair
Replace bearings
- Disassemble and
clean pump
- Call nearest authorized
-
service center
throttling discharge line.
If cavitation persists,
check:
- Suction height
- Pressure loss along
suction line (diame-
ter of pipe, elbows
etc.)
- Liquid temperature
- Discharge line
backpressure
12
rev. 01/19
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