Mast Pumpen K 2 - 5 Troubelshooting

15
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 ...
Cause
Action
... the motor does not start
No electricity or not properly
connected
Connect power supply correctly
Check fault-current protective
switch
Check power cable
Front fuse defective
Change fuse
Eliminate cause of fuse failure
Pump switched off by
temperature cut-out
Eliminate sluggishness or pump
blockage
Pump blocked
Remove foreign body from casing
and/or impeller
Motor defective
This work may only be
done at the factory
Have m1otor replaced
Malfunction in float
switch/float
Make float switch or float
accessible and clean
(see chapter 4)
This work may only be
done at the factory
Replace defective float switch
Condenser or coil defective
This work may only be
done at the factory
Have motor repaired
... the motor starts but the
pump does not pump
Pump or pressure line
blocked
Clean pump or pressure line
Slide in pressure line not
open or not open wide
enough
Open slide
Air in the pressure line or in
pump casing
Bleed air from pressure line
... the pump pumps too
little
Impeller soiled or worn
Clean or replace impeller
Pressure line blocked
Clean pressure line
Pumping height or pressure
loss in line too great
Use wider line
Use more powerful pump, if
necessary
Viscosity or specific gravity
of pump medium too high
Ask our customer service.
... the pump does not
switch off
Malfunction on float
switch/float
Make float switch or float
accessible and clean
(see chapter 4)
This work may only be
done at the factory
Replace defective float switch