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Fault
Possible cause
Remedy
❑
Pump does not
start or stops im-
mediately.
➨
Electrical power cord
not plugged in, electri-
cal supply failure?
✔
Plug in power cord.
Check fuse. Check supply
voltage.
➨
Device fuse blown?
✔
Identify cause of failure.
Replace device fuses.
➨
Overpressure in outlet
line?
✔
Remove blockage in line,
open valve.
➨
Motor overloaded?
✔
Allow motor to cool down,
identify and eliminate
cause of failure. Manual
reset is necessary. Switch
off pump or unplug.
❑
Pump does not
achieve its ultimate
vacuum or usual
pumping speed.
➨
Leak in the tubing or
vacuum system?
✔
Check pump directly -
connect vacuum gauge
directly at pump inlet -
then check connection,
tubing and vacuum sys-
tem if necessary.
➨
Long, narrow vacuum
line?
✔
Use lines with larger di-
ameter, length as short as
possible.
➨
Pump has been ex-
posed to condensate?
✔
Allow pump to run for
some minutes with atmo-
spheric pressure at the
inlet to purge.
➨
Deposits have been
formed inside the
pump?
✔
Clean and inspect the
pump heads.
➨
Diaphragms or valves
damaged?
✔
Replace diaphragms and/
or valves.
➨
Outgassing substances
or vapor generated in
the process?
✔
Check process parame-
ters.
Troubleshooting
