8. 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.
WARNING
Escaping liquid
Death or serious personal injury
‐ Make sure that the escaping liquid
does not cause injury to persons or
damage to the motor or other
components.
‐ In hot-liquid installations, pay special
attention to the risk of injury caused by
scalding hot liquid.
‐ In cold-liquid installations, pay special
attention to the risk of injury caused by
the cold liquid.
Fault Cause and remedy
The motor does not run when started.
Power supply failure.
The fuses are blown.
The motor protection device has tripped.
The main contacts in the motor protection device are not making
contact or the coil is faulty.
The control circuit fuses are defective.
The motor is defective.
The motor protection device trips
immediately when the power supply is
switched on.
Power supply failure.
The contacts in the motor protection device are faulty.
The cable connection is loose or faulty.
The motor winding is defective.
The pump is mechanically blocked.
The overload setting is too low.
The motor protection device trips
occasionally.
The overload setting is too low.
The supply voltage is periodically too low or too high.
The differential pressure across the pump is too low.
The motor protection device has not
tripped, but the pump does not run.
Power supply failure.
The fuses are blown.
The main contacts in the motor protection device are not making
contact or the coil is faulty.
The control circuit fuses are defective.
The pump capacity is not constant.
The pump inlet pressure is too low.
The inlet pipe or pump is partly blocked by impurities.
The pump draws in air.
The pump runs but gives no water.
The inlet pipe or pump is blocked by impurities.
The foot or non-return valve is blocked in closed position.
There is a leakage in the inlet pipe.
There is air in the inlet pipe or pump.
The motor rotates in the wrong direction.
The pump runs backwards when switched
off.*
There is a leakage in the inlet pipe.
The foot or non-return valve is defective.
The foot or non-return valve is blocked in open or partly open
position.
22
English (GB)
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