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The protective
device against dry
running has tripped.
The fuses for the
pump or auxiliary
circuits are blown.
7.3 The electric pump starts, but the
thermal protector trips or the fuses
blow immediately after
Cause
The power supply
cable is damaged.
The thermal
protection or fuses
are not suited for the
motor current.
The electric motor is
short circuit.
The motor overloads.
7.4 The electric pump starts, but the
thermal protector trips or the fuses
blow a short time after
Cause
The electrical panel is
situated in an
excessively heated
area or is exposed to
direct sunlight.
The power supply
voltage is not within the
working limits of the
motor.
A power phase is
missing.
7.5 The electric pump starts, but the
thermal protector trips a varying time
after
Cause
There are foreign
objects (solids or
fibrous substances)
inside the pump
which have jammed
the impeller.
The pumps delivery
rate is higher than
the limits specified
on the data plate.
The pump is
overloaded
because it is
pumping liquid that
is too dense and
Check the:
liquid level in the
tank, or the mains
pressure.
protective device
and its connecting
cables.
Replace the fuses.
Remedy
Check the cable and
replace as necessary.
Check the components
and replace as
necessary.
Check the components
and replace as
necessary.
Check the operating
conditions of the pump
and reset the
protection.
Remedy
Protect the electrical
panel from heat
source and direct
sunlight.
Check the operating
conditions of the
motor.
Check the
power supply
electrical
connection
Remedy
Contact the local sales
and service
representative.
Partially close the on-off
valve down stream until
the delivery rate is
equal or less than the
limits specified on the
data plate.
Check the actual power
requirements based on
the characteristics of
the pumped liquid and
replace the motor
viscous.
The motor bearings
are worn.
7.6 The electric pump starts, but the
system's general protection is
activated
Cause
A short circuit in the
electrical system.
7.7 The electric pump starts, but the
system's residual current device
(RCD) is activated
Cause
Remedy
There is an
Check the insulation of the
ground (earth)
electrical system
leakage.
components.
7.8 The pump runs but delivers too
little or no liquid
Cause
Remedy
There is air inside
Bleed the air.
the pump or the
piping.
Stop the pump and
The pump is not
repeat the prime
correctly primed.
procedure.
If the problem continues:
The throttling on
Open the valve.
the delivery side is
too extensive.
Valves are locked
Disassemble and clean
in closed or
the valves.
partially closed
position.
The pump is
Contact the local sales
clogged.
and service
representative.
The piping is
Check and clean the
clogged.
pipes.
The rotation
Change the position of
direction of the
two of the phases on the
impeller is wrong
terminal board of the
(three-phase
motor or in the electric
version)
control panel.
Check the operating
The suction lift is
conditions of the pump. If
too high or the
necessary, do the
flow resistance in
following:
the suction pipes
is too great.
en - Original instructions
accordingly.
Contact the local sales
and service
representative.
Remedy
Check the
electrical system.
Check that the
mechanical seal is
not leaking.
Check the suction
pipe for perfect
tightness.
Replace any valves
that are leaking.
Decrease the suction
lift.
Increase the
diameter of the
suction pipe.
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