Diaphragm liquid pump NF 1.25
Troubleshooting
KNF Flodos AG
BA_NF1.25_EN_03_163242
Translation of Original Operating and Installation Instructions, English
18
9. Troubleshooting
➔
Disconnect the pump power supply before working on the
pump.
➔
Make sure 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
Connections or hoses are
blocked
➔
Check connections and hoses
➔
Remove blockage
External valve is closed or filter
is clogged.
➔
Check external valves and filters
Diaphragm, anchor valves or
seals are worn.
➔
Replace diaphragm, anchor valves and seals
(see Chapter 8.3).
Tab. 12
Pump is not priming
Cause
Fault remedy
Suction side of pump not con-
nected
➔
Connect the suction side of the pump
Liquid in the priming container is
too low
➔
Fill priming container
Hose connections are not leak-
tight
➔
Secure transition joints between hose and connections with
clamps or other clamping elements
System valve is closed or filter
is clogged
➔
Open system valve
➔
Clean filter
Pump head is filled with gas:
the system is unable to handle
the pressure on the pressure
side
➔
Reduce pressure at pressure side
Particles in the pump
➔
Clean the pump head (see Chapter 8.2)
The pump parts are not re-
sistant to the medium to be
pumped
➔
Replace the pump head with a compatible version
Incorrect interchange of pres-
sure and suction line connec-
tions
➔
Remove pressure and suction lines and re-connect correctly
Tab. 13
