Troubleshooting For Users - Xylem LOWARA ESHS Manuel D'installation

7 Troubleshooting

7.1 Troubleshooting for users

The main switch is on,
but the pump unit does not start.
Cause
The thermal protector
incorporated in the
pump (if any) has
tripped.
The protective device
against dry running
has tripped.
The pump unit 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 pump is
overloaded because it
is pumping liquid that is
too dense and viscous.
The pump runs but delivers too little or no liquid.
Cause Solution
The pump is Contact Xylem or the
clogged. Authorised Distributor.
The troubleshooting instructions in the tables below
are for installers only.
7.2 The main switch is on, but the
pump unit does not start
Cause Solution
There is no power
supply.
The protective Check:
device against dry
running has
tripped.
Solution
Wait until the pump has
cooled down. The thermal
protector will automatically
reset.
Check the liquid level in
the tank, or the mains
pressure.
Solution
Contact Xylem or the
Authorised Distributor.
Check the actual power
requirements based on
the characteristics of
the pumped liquid and
then contact Xylem or
the Authorised
Distributor.
•
Restore the power
supply.
•
Make sure all electrical
connections to the
power supply are
intact.
•
liquid level in the tank,
or the mains pressure.
•
protective device and
its connecting cables.
7.3 The pump unit 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 pump unit 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 pump unit 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
viscous.
The motor bearings
are worn.
en – Original instructions
Solution
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.
Solution
Protect the electrical
panel from heat source
and direct sunlight.
Check the operating
conditions of the motor.
Check the
•
Power supply
•
Electrical
connection
Solution
Contact Xylem or the
Authorised Distributor.
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 accordingly.
Contact Xylem or the
Authorised Distributor.
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