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PROBLEM
The motor does not start
Pump blocked
The pump functions but
no water comes out
Insufficient flow
POSSIBLE CAUSE
Unsuitable power supply
Incorrect electrical connections
Engine overload protective device cuts in.
Blown or defective fuses
Shaft blocked
If the above causes have already been checked,
the engine may be malfunctioning
Prolonged periods of inactivity with
formation of rust inside the pump
Presence of solid bodies in the pump
rotor
Bearings siezed
Possible infiltration of air from suction tube
connections, drain plugs or filling of pump or from
the gaskets of the suction pipe
Foot valve blocked or suction pipe not fully
immersed in liquid
Suction filter blocked
Pipes and accessories with diameter too small
causing excessive loss of head
Presence of deposits or solid bodies in
the internal passages of the rotor
Rotor deteriorated
Worn rotor and pump case
Excessive viscosity of the liquid
pumped (if other than water)
Incorrect direction of rotation
Suction head excessive in relation to
the suction capacity of pump
Suction pipe too long
SOLUTION
Check that the mains frequency and voltage correspond to the
electrical characteristics shown on the indicator plate.
Connect the power supply cable to the terminal board correctly.
Check that the thermal overload protection is set correctly (see
data on the engine indicator plate) and make sure that the
fuseboard upline of the engine has been properly connected.
Check the power supply and make sure that the pump shaft is
turning freely. Check that the thermal overload protection has
been set correctly (see engine indicator plate).
Replace the fuses, check the electric power supply and points.
Check that the mains frequency and voltage correspond to the
electrical characteristics shown on the indicator plate.
Check the power supply and make sure that the pump shaft is
turning freely. Check that the thermal overload protection has
been set correctly (see engine indicator plate).
Remove the cause of blockage as indicated in the "Blocked
pump" instruction booklet.
Repair or replace the engine by applying to an authorized
service center.
Rotation may be started directly from the pump shaft or from
thejoint (remember to turn off the electricity supply first ) or
contact an authorised service centre.
If possible, dismantle the pump casing and remove any
solid foreign bodies inside the rotor, if necessary contact an
authorized service center.
If the bearings are damaged replace them or if necessary
contact an authorized service center.
Check which part is not tight and seal the connection
adequately.
Clean or replace the bottom valve and use a suction pipe
suitable for the application.
Clean the filter, if necessary, replace it . Rotation may be started
directly from the pump shaft or from the joint (remember to
turn off the electricity supply first) or contact an authorised
service centre.
Use pipes and accessories suitable for the specific application.
Clean the rotor and install a suction filter to prevent other
foreign bodies from entering.
Replace the rotor, if necessary, contact an authorized service
center.
Replace the rotor and the pump casing.
The pump is unsuitable.
Invert the electrical connections on the terminal board or
control panel.
Try to close the feeder gate partially and/or reduce the
difference in level of the pump and the liquid being aspirated.
Bring the pump closer to the suction tank so as to use a shorter
pipe. If necessary use a pipe of a wider diameter.
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