Diaphragm liquid pump NF 30, NFB 30
Troubleshooting
KNF Flodos AG BA_NF30_EN_05_069206.docx
Translated from the Original Operating and Installation Instructions
25
9. Troubleshooting
For pumps with alternating current motors:
DANGER
Risk of electric shock, danger of death
➔
Before working on the pump disconnect the pump
from the power supply.
➔
Ensure that the pump is de-energised.
Pump does not work
Cause
Fault remedy
Pump not connected to mains
power supply.
➔
Connect pump to mains supply.
Power supply is not switched
on.
➔
Switch on power supply.
Thermal switch or pump
electronics have responded.
➔
Disconnect pump from mains power supply.
➔
Allow pump to cool.
➔
Identify and eliminate cause of overheating/overload.
Connections or pipes are
blocked.
➔
Check pipes and connections.
➔
Remove blockage.
External valve is closed or filter
is blocked.
➔
Check external valves and filters.
Diaphragm or valves are worn
out.
➔
Replace diaphragm and valve plate
(see Section 8.3).
Tab. 15
Pump is not priming
Cause
Fault remedy
Suction side of pump not
connected.
➔
Connect the suction side of the pump.
Liquid in the container is too
low.
➔
Fill container.
Hose connections are not leak-
tight.
➔
Secure transition joints between hose and connections with
clamps or clamping elements.
System valve is closed or filter
is blocked.
➔
Open the valve.
➔
Clean filter.
Pump head is filled with gas.
The system is unable to handle
the pressure on the pressure
side.
➔
Reduce pressure on pressure side.
Particles in the pump.
➔
Clean the pump head (see Section 8.2).
The head parts are not media-
resistant.
➔
Replace the pump head with a compatible version.
Incorrect interchange of outlet
and inlet line connections.
➔
Remove outlet and inlet lines and re-connect correctly.
Tab. 16
