Troubleshooting
Diaphragm Vacuum Pumps N86.16
24
Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
10. Troubleshooting
DANGER
Extreme danger from electrical shock!
Disconnect the pump power supply before work-
ing on the pump.
Make sure the pump is de-energized and se-
cure.
Check the pump (see Tab. 12 and Tab. 13).
Pump does not transfer
Cause
Fault remedy
Pump is not connected to the
electrical mains.
Connect pump to the electrical mains.
No voltage in the electrical
mains.
Check room fuse and switch on if necessary.
Connections or lines are
blocked.
Check connections and lines.
Remove blockage.
External valve is closed or filter
is clogged.
Check external valves and filters.
Condensate has collected in the
pump head.
Separate the source of the condensate from the pump.
Flush the pump with air at atmospheric pressure for a few
minutes (if necessary for safety reasons: with an inert gas).
Install the pump at the highest point in the system.
Thermal switch of the motor has
tipped.
Disconnect pump from electrical mains.
Allow pump to cool.
Determine cause of the overheating and rectify.
Diaphragm or valve plates are
worn or defective.
Replace working diaphragm, safety diaphragm and reed
valves (see Chapter 9.3).
Tab. 12
