Diaphragm pump N87.9
Troubleshooting
Translation of Original Operating and Installation Instruction, english, KNF 121538-121541 11/22
27
9 Troubleshooting
DANGER
Danger: electric shock can be life-threatening.
à
All work on the pump may only be performed
by an authorized specialist.
à
Before working on the pump: Disconnect the
pump from the power supply.
à
Check and ensure that no voltage is present.
à
Allow the pump to cool before troubleshooting.
à
Check the pump (see following tables).
Pump not pumping
Cause
Troubleshooting
Pump is not connected to the
power supply.
à
Connect the pump to the power supply.
No voltage from the power supply.
à
Check the circuit breaker for the line and reset if
necessary.
Pneumatic connections or lines are
blocked.
à
Check the connections and lines.
à
Remove the blockage.
External valve is closed or filter is
clogged.
à
Check external valves and filters.
Condensation has collected in the
pump head.
à
Isolate the source of condensation from the
pump.
à
Flush the pump with air at atmospheric pressure
for a few minutes (if necessary for safety reasons:
with an inert gas).
à
Install the pump at the highest location in the sys-
tem.
Diaphragm or reed valves are worn
or defective.
à
Change the diaphragm and valve springs (see
Chapter Changing diaphragm and reed valves).
Tab.17