12. Fault finding the product
DANGER
Electric shock
Death or serious personal injury
‐ Before removing the terminal box
cover and before removing or
dismantling the pump, make sure that
the power supply has been switched
off and that it cannot be accidentally
switched on again.
WARNING
Escaping liquid
Death or serious personal injury
‐ Pay attention to the orientation of the
vent hole to ensure that the escaping
liquid does not cause personal injury or
damage to the motor or other
components. In hot-liquid installations,
pay special attention to the risk of
personal injury caused by scalding hot
liquid. In cold-liquid installations, pay
special attention to the risk of personal
injury caused by cold liquid.
CAUTION
Hot or cold surface
Minor or moderate personal injury
‐ When pumping hot or cold liquids,
make sure that persons cannot
accidentally come into contact with hot
or cold surfaces.
Fault Cause Remedy
1. The pump delivers no or too little
liquid.
a) The electrical connection is
wrong, for instance two phases.
Check the electrical connection
and remedy, if necessary.
b) The direction of rotation is
wrong.
Interchange two phases of the
power supply.
c) There is air in inlet pipe. Vent the inlet pipe or the pump.
d) The counterpressure is too high.
Set the duty point in accordance
with the data sheet. Check the
system for impurities.
e) The inlet pressure is too low.
Increase the liquid level on the inlet
side. Open the isolating valve in
the inlet pipe. Make sure that all
the conditions in section Pipes are
complied with.
f) The inlet pipe or impeller is
blocked by impurities.
Clean the inlet pipe or pump.
g) The pump draws in air due to a
defective seal.
Check the pipeline seals, pump
housing gaskets and shaft seals.
Replace gaskets and seals, if
necessary.
h) The pump draws in air due to
low liquid level.
Increase the liquid level on the inlet
side and keep it as constant as
possible.
37
English (GB)
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