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13
13. Further product information
13.1 Service documentation
Service documentation is available in Grundfos
Product Center
(http://product-selection.grundfos.com/).
If you have any questions, please contact the
nearest Grundfos company or service workshop.
14. 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.
7. The pump runs, but gives
no water.
a) Pump inlet pressure too low. See 5. a).
b) The suction pipe is partly
clogged by impurities.
See 5. b).
c) The foot or non-return valve is
stuck in its closed position.
Remove and clean, repair or replace
the valve.
d) Leakage in suction pipe. See 5. c).
e) Air in suction pipe or pump. See 5. d).
8. When startup is attempted,
the pump will start, but
delivers no pressure or flow.
Self-priming pumps only:
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
in section 6.2.2 Pipe connection
(self-priming pumps).
b) Suction pipe draws in air. Make sure that the suction pipe is
airtight from pump to liquid level.
Repeat the startup procedure in
section 6.2.2 Pipe connection
(self-priming pumps).
9. The pump runs, but does
not deliver the rated flow.
Self-priming pumps only:
a) The internal valve did not
close.
Close the tap gradually until a
sudden rise in pressure or flow can
be seen. Then open the tap
gradually until the required flow is
reached.
10. The pump runs backwards
when switched off.
a) Leakage in suction pipe. See 5. c).
b) Foot or non-return valve
defective.
See 7. c).
c) The foot valve is stuck in
completely or partly open
position.
See 7. c).
11. The pump runs with
reduced performance.
a) Wrong direction of rotation.
Three-phase pumps only:
Switch off the power supply with the
external circuit breaker, and
interchange two phases in the pump
terminal box. See also section
8.3 Checking the direction of
rotation.
b) See 5. a), b), c), d).
Fault Cause Remedy
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