Troubleshooting, Notice – VACUUBRAND BVC 21 NT VARIO User Manual
Page 19
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.: 999157 / 10/12/2009
Troubleshooting
Fault
Possible cause
Remedy
❑ Pump fails to start, sys-
tem becomes vented.
➨ Mains not plugged in, failure
of electrical supply?
✔ Plug in mains plug. check
mains fuse.
➨ Motor overloaded?
✔ Allow motor to cool, identify
cause of failure.
➨ Pressure control device de-
fective?
✔ Contact your local distributor.
➨ Internal fuse blown (BVC 21
NT VARIO)?
✔ Identify cause of failure, re-
place fuse (under the cover).
➨ Adjusting knob at right stop
position (atmosphere, no
vacuum)?
✔ Turn adjusting knob in direc-
tion “+“ (more vacuum).
➨ Filter clogged?
✔ Replace filter.
❑ No aspiration at the VHC,
pipette drips.
➨ Adapter or aspiration tube
defective?
✔ Replace adapter with aspira-
tion tube.
➨ Filter clogged?
✔ Replace filter.
➨ Leak at the bottle head?
✔ Check seals, coupling and
blind cap. Screw in or re-
place if necessary.
➨ No pumping speed of the
pump?
✔ Perform maintenance, re-
place diaphragm and valves
if necessary.
➨ Adjusting knob at right stop
position (atmosphere, no
vacuum)?
✔ Turn adjusting knob in direc-
tion “+“ (more vacuum).
❑ Pressure control device
switches frequently.
➨ Leak in the system?
✔ Check tubing, seals, coupling,
and blind cap. Screw in or
replace if necessary.
➨ Filter clogged?
✔ Replace filter.
➨ Diaphragms or valves of the
pump defective?
✔ Perform maintenance, re-
place diaphragm and valves
if necessary.
❑ Pump is running continu-
ously.
➨ Leak in the system?
✔ Check tubing, seals, coupling,
and blind cap. Screw in or
replace if necessary.
➨ Pressure control device de-
fective?
✔ Contact your local distributor.
➨ Adjusting knob at left stop
position or close to it (vacuum
demand below ultimate
vacuum of the pump)?
✔ Turn the adjusting knob to
the right in direction “-“ (less
vacuum).
A
service manual with exploded view drawings, spare part lists and directions for
repair is available on request (only in German or English).
☞
The service manual is for trained service people.
NOTICE