Troubleshooting Tables 151
6
Sample injection
problem (continued)
Vial septum not being
pierced
Re-inject from the sample vial with a
cap in place. Inspect if a hole is being
made by the injector. If no hole is
made, there is a problem with the
injector/needle.
Misaligned sample
transport system
Call Waters.
Defective injector
seals
Replace injector seals (see
Section 5.3, Replacing the Seal Pak
).
No solvent flow
through injector
Autosampler not
connected to pump
Attach fluid lines to pump (see pump
operator’s manual).
Autosampler stuck in
purge (valve 1 closed)
Restart operation to reposition valve. If
problem continues, repair/replace
valve (call Waters).
Blocked injection valve Purge the autosampler. If problem
continues, repair/replace the injection
valve.
Leak within autosam-
pler or prior to
autosampler
Check for leaks. Tighten loose fittings.
If leaks continue, verify fittings and
ferrules within autosampler for wear.
Replace if necessary.
High system pressure
due to autosampler
Blocked in-line filters Replace filter inserts (see Section 5.4,
Replacing In-Line Filters).
Blocked needle due to
particles in sample
Refer to the Corrective Action under
the “Sample not being injected”
symptom listed above.
Blocked injection valve Purge the autosampler. If problem
continues, repair/replace the valve.
Sample not miscible
with mobile phase
To verify solubility, place sample and
mobile phase in a test tube and
observe if the sample dissolves. If
necessary, further dilute the sample or
change the mobile phase.
Table 6-8 Autosampler Troubleshooting (Continued)
Symptom Possible Cause Corrective Action
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