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5
Troubleshooting
Always assure that the plug is disconnected from the power supply and the pump is not
powered before servicing the pump.
Action to take if ...
... the motor does not start
... the motor starts but the
pump does not pump
... the pump pumps too
little
... the pump does not
switch off
Cause
No electricity or not properly
connected
Front fuse defective
Pump switched off by
temperature cut-out
Pump blocked
Motor defective
Malfunction in float
switch/float
Condenser or coil defective
Pump or pressure line
blocked
Slide in pressure line not
open or not open wide
enough
Air in the pressure line or in
pump casing
Impeller soiled or worn
Pressure line blocked
Pumping height or pressure
loss in line too great
Viscosity or specific gravity
of pump medium too high
Malfunction on float
switch/float
Action
•
Connect power supply correctly
•
Check fault-current protective
switch
•
Check power cable
•
Change fuse
•
Eliminate cause of fuse failure
•
Eliminate sluggishness or pump
blockage
•
Remove foreign body from casing
and/or impeller
This work may only be
done at the factory
•
Have m1otor replaced
•
Make float switch or float
accessible and clean
(see chapter 4)
This work may only be
done at the factory
•
Replace defective float switch
This work may only be
done at the factory
•
Have motor repaired
•
Clean pump or pressure line
•
Open slide
•
Bleed air from pressure line
•
Clean or replace impeller
•
Clean pressure line
•
Use wider line
•
Use more powerful pump, if
necessary
•
Ask our customer service.
•
Make float switch or float
accessible and clean
(see chapter 4)
This work may only be
done at the factory
•
Replace defective float switch
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