Troubleshooting 83
5
Erratic flow rate/pump
pulsations (continued)
Reservoir low or out of eluent Refill the reservoir (filter and
degas eluent).
Air bubble in pump head Prime the pump to remove the
bubble. Ensure there are no air
bubbles in the inlet lines.
Degas eluents.
Dirty or malfunctioning check
valve(s)
Replace check valves (see
Section 4.4
or Section 4.6).
Inlet filter or inlet lines blocked Check lines for blockages.
Replace the inlet filter frit.
Pump plunger seal leaking
(under pump head)
Replace the pump plunger
seal (see Section 4.3
or
Section 4.5
).
Worn pump plunger Replace the plunger (see
Section 4.3
or Section 4.5).
Immiscible eluents in pump
head
Refer to the Corrective Action
under the “Pump not delivering
eluent” symptom earlier.
Pump cavitation Refer to the Corrective
Action(s) under the “Pump not
delivering eluent” symptom
earlier.
Pump electronics failure Contact Waters Technical
Service.
High system pressure
due to pump
Pump Flow parameter set too
high
Set the correct flow parameter
value.
Pressure transducer out of
adjustment or defective
Contact Waters Technical
Service.
Table 5-1 Correcting Pump Problems (Continued)
Symptom Possible Cause Corrective Action
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