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Troubleshooting
Fault
❑ Pump does not start or
stops immediately.
❑ Pump does not achieve
its ultimate vacuum or
usual pumping speed.
❑ Pump too noisy.
❑ Pump seized.
A service manual with exploded view drawings, spare parts list and directions for
NOTICE
repair is available on request.
☞
Documents are only to be used and distributed completely and unchanged. It is strictly the users' responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 997832 / 03/02/2009
page 16 of 26
Possible cause
➨
Mains not plugged in, electri-
cal supply failure?
➨
Pressure in outlet pipeline too
high?
➨
Motor overloaded?
➨
Centring ring at small flange
connection not correctly posi-
tioned or leak in the pipeline
or vacuum system?
➨
Long, narrow line?
➨
Pump has been exposed to
condensate?
➨
Deposits have been formed
inside the pump?
➨
Diaphragms or valves dam-
aged?
➨
Outgassing substances or
vapour generated in the proc-
ess?
➨
Atmospheric or high pressure
at the pump inlet?
➨
Diaphragm crack or dia-
phragm clamping disc loose?
➨
Other than above mentioned
causes?
The service manual is intended for trained service people only.
Remedy
✔
Plug in mains. Check fuse.
✔
Remove blockade in line.
✔
Allow motor to cool down,
identify and eliminate cause
of failure. Manual reset is
necessary. Switch off pump
or unplug mains.
✔
Check pump directly - con-
nect vacuum gauge directly at
pump inlet - then check con-
nection, pipeline and vacuum
system if necessary.
✔
Use lines with larger di-
ameter, length as short as
possible.
✔
Allow pump to run for some
minutes with atmospheric
pressure at the inlet.
✔
Clean and inspect the pump
heads.
✔
Replace diaphragms and/or
valves.
✔
Check process parameters.
✔
Connect hose or silencer to
pump outlet.
✔
Perform maintenance.
✔
Contact local distributor.
✔
Contact local distributor.
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