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Fault Possible cause Remedy
❑
Pump fails to start,
system becomes
vented.
➨
Not plugged in, or failure
of electrical supply?
✔
Plug in, or check fuse
controlling power outlet.
➨
Power switched off?
✔
Switch on power.
➨
Motor overloaded?
✔
Switch off, allow motor
to cool, identify cause of
failure and eliminate be-
fore switching on again.
➨
Internal fuse blown?
✔
Identify cause of failure,
replace fuse (under the
cover).
➨
Aspiration power setting
is off (atmosphere, no
vacuum)?
✔
Set aspiration power to
“+“ (more vacuum).
➨
Red LED glows continu-
ously?
✔
Eliminate leaks.
➨
Filter clogged?
✔
Replace lter.
❑
No aspiration at the
VHC
pro
, pipette drips
(above causes ex-
cluded).
➨
Adapter or aspiration
tube defective?
✔
Replace adapter with
aspiration tube.
➨
Filter clogged?
✔
Replace lter.
➨
Leak at the bottle head?
✔
Check seals, coupling
and blind cap. Screw in
or replace if necessary.
➨
Pump operating but no
pumping speed?
✔
Perform maintenance,
replace diaphragm and
valves if necessary.
➨
Aspiration power setting
is off (atmosphere, no
vacuum)?
✔
Set aspiration power to
“+“ (more vacuum).
❑
Pump switches
frequently.
➨
Leak in the system?
✔
Check tubing, seals,
coupling, and blind cap.
Screw in or replace if
necessary.
➨
Filter clogged?
✔
Replace lter.
➨
Diaphragms or valves of
the pump defective?
✔
Perform maintenance,
replace diaphragm and
valves if necessary.
Troubleshooting
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