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The electric pump starts, but the thermal protection
trips a varying time after.
Cause
There are foreign objects
(solids or fibrous sub-
stances) inside the pump
which have jammed the
impeller.
The pump is overloaded
because it is pumping liq-
uid that is too dense and
viscous.
The pump runs but delivers too little or no liquid.
Cause
Remedy
The pump is clog-
Contact the Sales and Service
ged.
Department.
The troubleshooting instructions in the tables below
are for installers only.
7.2 The main switch is on, but the
electric pump does not start
Cause
There is no power
supply.
The thermal protector
incorporated in the
pump (if any) has trip-
ped.
The thermal relay or
motor protector in the
electric control panel
has tripped.
The protective device
against dry running
has tripped.
The fuses for the
pump or auxiliary cir-
cuits are blown.
7.3 The electric pump starts, but
the thermal protector trips or the
fuses blow immediately after
Cause
The power supply ca-
ble is damaged.
Remedy
Contact the Sales and
Service Department.
Check the actual power
requirements based on
the characteristics of the
pumped liquid and then
contact the Sales and
Service Department.
Remedy
• Restore the power sup-
ply.
• Make sure all electrical
connections to the pow-
er supply are intact.
Wait until the pump has
cooled down. The thermal
protector will automatically
reset.
Reset the thermal protec-
tion.
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 re-
place as necessary.
Cause
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 situ-
ated 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. Check the
7.5 The electric pump starts, but
the thermal protector trips a varying
time after
Cause
There are foreign ob-
jects (solids or fibrous
substances) inside the
pump which have jam-
med the impeller.
The pumps delivery
rate is higher than the
limits specified on the
data plate.
The pump is overload-
ed because it is pump-
ing liquid that is too
dense and 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 electri-
cal system.
en - Original instructions
Remedy
Check the components
and replace as necessary.
Check the components
and replace as necessary.
Check the operating condi-
tions of the pump and re-
set the protection.
Remedy
Protect the electrical
panel from heat source
and direct sunlight.
Check the operating
conditions of the motor.
• power supply
• electrical connec-
tion
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 speci-
fied on the data plate.
Check the actual power re-
quirements based on the
characteristics of the
pumped liquid and replace
the motor accordingly.
Contact the local sales and
service representative.
Remedy
Check the electrical
system.
21
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