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.: 999155 / 29/01/2009
page 21 of 36
Troubleshooting
A service manual with exploded view drawings, spare parts list and directions for
repair is available on request.
☞
The service manual is intended for trained service people only.
NOTICE
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
overpressure in the system
(pressure adjustment device
ME 4R NT).
➨
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.
➨
Vacuum adjustment device
open (ME 4R NT)?
✔
Close vacuum adjustment
device.
➨
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.
➨
Atmospheric or high pressure
at the pump inlet?
✔
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.
