English (GB)
13
9. Disposing of the product
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.
The crossed-out wheelie bin symbol on
a product means that it must be
disposed of separately from household
waste. When a product marked with this
symbol reaches its end of life, take it to a
collection point designated by the local
waste disposal authorities. The separate collection
and recycling of such products will help protect the
environment and human health.
See also end-of-life information at
www.grundfos.com/product-recycling.
14. The pump runs
backwards when
switched off.
a) Leakage in the inlet pipe. Remove and repair the inlet pipe.
b) The foot or non-return valve is
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 outlet
pressure is stable and the noise has
ceased.
16. When startup is
attempted, the
pump starts, but
delivers no
pressure or flow.
a) Liquid column above non-return
valve in outlet pipe prevents the
pump from self-priming.
Empty the outlet pipe. Make sure that
the non-return valve does not hold back
liquid in the outlet pipe. Repeat the
startup procedure.
b) The inlet pipe draws in air. Make sure that the inlet 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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