Section 6: TROUBLESHOOTING
6.10 Vacuum Problems
Leakage, contamination and unusual outgassing are the general causes of problems associated with poor vacuum.
To operate at maximum efficiency a system must be thoroughly clean. If the system is completely clean and free
from leaks, and unwarrantable vacuum problems still exist, the pump should be checked. A simple criterion for
checking the condition of the pump is the determination of its maximum vacuum capability. This can be
accomplished by blocking off the intake and reading the vacuum level on the gauge. (See Section 2.25)
17
Problem
Possible Cause
Solution
�
Power off
�
Check all power connections
�
Pump under Vacuum
�
Disconnect pump from system.
Open vacuum control valve and
Gas ballast.
Pump
not
worki
ng
�
Self Diagnostic Test
�
Do nothing - the pump is running a
30sec. self diagnostic test to ensure
all components are working correctly.
If problem persists, contact Welch
Technical Support*.
�
Open vacuum control valve and gas
ballast.
Pu
m
p
st
al
le
d
�
Pump under vacuum
Note:
Pump Cannot Start Under Vacuum
�
Turn-off and UNPLUG PUMP,
remove top housing and turn fan a
few times. Replace cover and turn on,
if problem still persists contact Welch
Technical Support*.
Turn pump off, disconnect from
application, restart pump
�
Check vacuum pressure of 2027xx with
external vac. gauge, attached to pump
inlet fitting.
�
If external vac. gauge pressure is
different than unit's display by more
than 5 Torr, problem is with one of
three electronic parts (electronic
problems):
- Vac. pressure display
- Pressure pickup
- Electronic board
�
Loose or not completely inserted wire or
connector
�
All electronic connections on
electronic board and vac. display
should be rechecked to see that there
is no
�
Multi wired pickup ribbon connection at
pressure pickup may have loose/broken
one of the four wires (usually one of
outside wires).
�
New pickup should be installed or
repaired by re-soldering loose wire to
pressure pickup.
Electronic Failures
Display
Shows
unreliable
me
asureme
nts
�
Electronic board could have corrupted
software or calibration
�
Faulty board should be returned to
the factory to exchange it for new one
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