English (GB)
8
8. 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.
Subject to alterations.
14. The pump runs
backwards
when switched
off.
a) Leakage in suction pipe. Remove and repair the suction pipe.
b) Foot or non-return valve
defective.
Remove and clean, repair or replace the
valve.
c) The foot valve is stuck in
completely or partly open
position.
Remove and clean, repair or replace the
valve.
Self-priming pumps only:
15. The pump
performance is
unstable and the
pump is noisy.
a) The differential pressure across
the pump is too low. Close the tap gradually until the discharge
pressure is stable and the noise has ceased.
16. When startup is
attempted, the
pump will start,
but delivers no
pressure or flow.
a) Liquid column above non-return
valve in discharge pipe prevents
the pump from self-priming.
Empty the discharge pipe. Make sure that the
non-return valve does not hold back liquid in
the discharge pipe. Repeat the startup
procedure.
b) Suction pipe draws in air. Make sure that the suction pipe is airtight from
pump to liquid level. Repeat the startup
procedure.
17. The pump runs,
but does not
deliver the rated
flow.
a) The internal valve did not close.
Close the tap gradually until the pressure or
flow suddenly increases. Then open the tap
gradually until the required flow is reached.
Fault Cause Remedy
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