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page 14 of 24
No. 47800-2-02-5
Troubleshooting
Fault
Possible cause
Remedy
❑
Pump does not start or
stops immediately.
➨
Mains not plugged in, electri-
cal supply failure?
✔
Plug in mains. Check fuse.
➨
Device fuse blown?
✔
Identify cause of failure. Re-
place device fuse.
➨
Pressure in outlet pipeline or
in the system (at outlet side)
too high?
✔
Remove blockade in line,
open valve, or reduce over-
pressure in the system.
➨
Motor overloaded?
✔
Allow motor to cool down,
identify and eliminate cause
of failure. Manual reset is
necessary. Switch off pump
or unplug mains.
❑
Pump does not achieve
its ultimate vacuum or
usual pumping speed.
➨
Centring ring at small flange
connection not correctly posi-
tioned or leak in the pipeline
or vacuum system?
✔
Check pump directly - con-
nect vacuum gauge directly at
pump inlet - then check con-
nection, pipeline and vacuum
system if necessary.
➨
Long, narrow line?
✔
Use lines with larger di-
ameter, length as short as
possible.
➨
Pump has been exposed to
condensate?
✔
Allow pump to run for some
minutes with atmospheric
pressure at the inlet.
➨
Deposits have been formed
inside the pump?
✔
Clean and inspect the pump
heads.
➨
Diaphragms or valves dam-
aged?
✔
Replace diaphragms and/or
valves.
➨
Outgassing substances or
vapour generated in the proc-
ess?
✔
Check process parameters.
❑
Pump too noisy.
➨
Loud exhaust noise?
✔
Connect hose or silencer to
pump outlet.
➨
Diaphragm crack or dia-
phragm clamping disc loose?
✔
Perform maintenance.
➨
Other than above mentioned
causes?
✔
Contact local distributor.
❑
Pump seized.
✔
Contact local distributor.
