Lowara ESHE Original Instructions Manual page 11

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 Remedy
There is no power
supply.
The thermal protector Wait until the pump has
incorporated in the cooled down. The thermal
pump (if any) has trip- protector will automatically
ped. reset.
The thermal relay or Reset the thermal protec-
motor protector in the tion.
electric control panel
has tripped.
The protective device Check the:
against dry running
has tripped.
The fuses for the Replace the fuses.
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 Remedy
The power supply ca- Check the cable and re-
ble is damaged. place as necessary.
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.
• Restore the power sup-
ply.
• Make sure all electrical
connections to the pow-
er supply are intact.
• liquid level in the tank,
or the mains pressure
• protective device and its
connecting cables
Cause Remedy
The thermal protection Check the components
or fuses are not suited and replace as necessary.
for the motor current.
The electric motor is Check the components
short circuit. and replace as necessary.
The motor overloads. Check the operating condi-
tions of the pump and re-
set the protection.
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 Remedy
There are foreign ob- Contact the local sales and
jects (solids or fibrous service representative.
substances) inside the
pump which have jam-
med the impeller.
The pumps delivery Partially close the on-off
rate is higher than the valve down stream until the
limits specified on the delivery rate is equal or
data plate. less than the limits speci-
fied on the data plate.
The pump is overload- Check the actual power re-
ed because it is pump- quirements based on the
ing liquid that is too characteristics of the
dense and viscous. pumped liquid and replace
the motor accordingly.
The motor bearings Contact the local sales and
are worn. service representative.
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
Protect the electrical
panel from heat source
and direct sunlight.
Check the operating
conditions of the motor.
• power supply
• electrical connec-
tion
Remedy
Check the electrical
system.
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