Grundfos FV, Installation And Operating Instructions Manual, Page: 13 / 16

English (GB)
13
6. Fault finding
7. Disposal
This product or parts of it must be disposed of in an
environmentally sound way. Use appropriate waste collection
services. If this is not possible, contact the nearest Grundfos
company or service workshop.
Subject to alterations.
Fault Possible cause Possible remedy
Too low flow or no flow
Strainer is soiled. Clean the strainer.
Pump is switched off. Switch on the pump.
Suction line is installed incorrectly. Check the suction line and connection.
Internal diameter of suction line is too small.
Use suction line with larger internal
diameter.
Suction line is not tight. Check the line and connections.
Low-level or empty indication does not work
Signal line is not connected to the pump. Connect the signal line to the pump.
Contact type is set incorrectly.
Adapt setting of contact type
(see section
4.2.3
).
Reed switch is defective. Replace the foot valve or suction lance.