English (GB)
10
8. Fault finding chart
9. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
Warning
Before starting work on the pump, make sure that the power supply to the pump has been
switched off and that it cannot be accidentally switched on.
Fault
Indicator
lights
Cause
Remedy
Red
Green
1.
Pump does
not run.
a)
Power supply failure.
Switch on power supply.
Check cables and cable connections
for defects and loose connections.
b)
Fuses blown.
Check cables and cable connections
for defects, and replace the fuses.
c)
Sensor is defective.
Replace sensor.
2.
Pump
performanc
e is
unstable.
a)
Pump inlet pressure too low.
Check the inlet conditions of the
pump.
b)
Suction pipe is partly
blocked by impurities.
Remove and clean suction pipe.
c)
Leakage in suction pipe.
Remove and repair suction pipe.
d)
Air in suction pipe or pump.
Vent suction pipe or pump.
Check the inlet conditions of the
pump.
3.
Pump can
be reset but
runs only for
a few
seconds
a)
Pump inlet pressure too low.
Check the inlet conditions of the
pump.
b)
Suction pipe is partly
blocked by impurities.
Remove and clean suction pipe.
c)
The foot or non-return valve
is blocked in closed position.
Remove and clean, repair or replace
valve.
d)
Leakage in suction pipe.
Remove and repair the suction pipe.
e)
Air in suction pipe or pump.
Vent suction pipe or pump.
Check the inlet conditions of the
pump.
4.
Pump runs
backwards
when
switched off.
a)
Leakage in suction pipe.
Remove and repair suction pipe.
b)
Foot or non-return valve
defective.
Remove and clean, repair or replace
valve.
c)
Foot valve is blocked in
completely or partly open
position.
Remove and clean, repair or replace
valve.
Subject to alterations.
