KNF N838 E Series - Page 48

Troubleshooting
Diaphragm pump N838_E
48
Translation of Original Operating and Installation Instruction, KNF
347394-347605 09/23
Pump not delivering
Cause Troubleshooting
Pump is not connected
to the electrical mains.
à
Connect the pump to the electrical mains.
No voltage in the elec-
trical mains.
à
Check the circuit breaker for the room and switch it
on if necessary.
Pneumatic connections
or lines are blocked.
à
Check the connections and lines.
à
Remove the blockage.
External valve is closed
or filter clogged.
à
Check external valves and filters.
Condensation has col-
lected in the pump
head.
à
Separate the source of the 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.
Thermal switch of the
motor has tripped.
à
Disconnect the pump from electrical mains.
à
Allow the pump to cool down.
à
Determine the cause of the overheating and elimi-
nate the cause.
Diaphragm and valves
are worn or defective.
à
Replace diaphragm and valves (see Chapter 8 Ser-
vicing [}32]).
Tab.16: