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any way dangerous for living things or for the environment. The user must
assess these risks and if necessary provide appropriate protection from
jets of liquid (i.e. screens) and collection vessels in a suitable position.
Liquid from leakages must be removed and disposed of correctly and
safely.
5.4 – RESIDUAL RISKS CAUSED BY FAULTY OPERATION
The pump is not provided with audible or visual alarms to indicate
breakages or malfunctioning. Therefore, the user must take suitable
measures to avoid damages (i.e. flooding) caused by failure or faulty
operation of the pump (i.e. installation of alarms, back-up pumps, etc.).
Problem
Possible cause
Remedy
Motor not turning and no humming
sound
No electricity
Check the power supply
System overcurrent or overload protection
triggered
Reset the protective device; if the problem persists contact
a qualified technician
Plug not inserted
Insert the plug
Power connections interrupted or incor-
rect electric connection
Contact a qualified technician
Switch positioned to “off”
Switch to the correct “on” position
Internal overload protection triggered (only
for pumps provided with this)
The protection is reactivated automatically; if the protection
is triggered again this means the application is too heavy
for the pump
Electrical fault
Contact a qualified technician
Motor making humming sound but not
turning
Impeller blocked
Contact a qualified technician
Electrical fault
Contact a qualified technician
Motor turning at low speed and
pump has reduced capacity
Incorrect supply voltage
Supply the pump with the voltage indicated on the
ratings plate
Overload
Application too heavy for the pump
Motor turning but reduced or no liquid
capacity
Suction hose end incorrectly positioned
See Chapter 4.2.2
Infiltration of air or leakage of liquid
Check hoses, tightness of hose clamp, fitting gaskets
Hoses or filters (if provided) clogged
Clean hoses and filter
Pump clogged
Contact a qualified technician
Pump worn
Contact a qualified technician
Operating head too high
Check the head
Pump not priming
Excessive suction height
Check the suction height
Pump not filled with liquid
Fill the pump with liquid
Suction hose end incorrectly positioned
See Chapter 4.2.2
Pump incorrectly positioned
See Chapter 4.2.1
Infiltrations of air
Check hoses, tightness of hose clamp, fitting gaskets
Wear and tear on gaskets or seal
Contact a qualified technician
Pump worn
Contact a qualified technician
Pump bubbling air in the suction tank
Incorrect pumping direction
Reverse pumping direction
Motor overheating
Overload
Application too heavy for the pump
Excessive liquid temperature
Application too heavy for the pump
Electrical fault
Contact a qualified technician
Abnormal noise during pumping
Foreign bodies have entered the pump
Contact a qualified technician
Impeller broken
Contact a qualified technician
Impeller seized
Contact a qualified technician
Bearing worn
Contact a qualified technician
Pump leaking
Wear and tear on gaskets or seal
Contact a qualified technician
6 - TROUBLESHOOTING
Содержание AL 12/20
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