4-32 Maintaining and Troubleshooting the Waters 515 Pump
Erratic flow
rate/pump
pulsations
(continued)
Reservoir low or out of
eluent
Refill reservoir (filter and degas
eluent).
Air bubble in pump head Prime pump to remove bubble.
Ensure there are no air bubbles
in the inlet lines. Degas eluents.
Dirty or malfunctioning
check valve(s)
Clean the check valves
(see“Cleaning and replacing
check valves” on page 4-18).
Inlet filter or inlet lines
blocked
Check lines for blockages.
Replace the inlet filter frit.
Pump plunger seal
leaking (under pump
head)
Replace pump plunger seal
(see“Cleaning and replacing seals
and plungers” on page 4-9).
Worn pump plunger Replace the plunger (see
“Cleaning and replacing seals and
plungers” on page 4-9).
Immiscible eluents in
pump head
See the Corrective Action under
the “Pump not delivering eluent”
symptom listed above.
Pump cavitation See the Corrective Action under
the “Pump not delivering eluent”
symptom listed above.
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
Set Flow parameter to zero and
adjust the zero pressure. If
problem continues, contact
Waters Technical Service.
Troubleshooting error messages and pump malfunctions (Continued)
Symptom Possible cause Corrective action
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