User guide

page 80 of 102
Fault Possible cause Remedy
❑
Pump does not
achieve its ultimate
vacuum or usual
pumping speed.
➨
Deposits have been
formed inside the
pump?
✔
Clean and inspect the
pump heads.
➨
Diaphragms or valves
damaged?
✔
Replace diaphragms and/
or valves.
❑
Pump too noisy.
➨
Atmospheric or high
pressure at the pump
inlet?
✔
Connect hose or silencer
to pump outlet. Be careful
not to cause outlet over-
pressure, especially with
condensable vapors.
➨
Diaphragm crack or
diaphragm clamping
disc loose?
✔
Perform maintenance.
➨
Other than above men-
tioned causes?
✔
Contact local distributor.
❑
Pump seized.
✔
Contact local distributor.
➨ 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.
* only if ”Sound: On” is selected