Troubleshooting 79
5
Table 5-1 Correcting Pump Problems
Symptom Possible Cause Corrective Action
High pressure Pump flow rate set too high Set the correct flow rate.
High-pressure limit set too low Set the high-pressure limit to
the correct value.
Blocked column Clean the column according to
the column care and use
manual.
Blocked mixer Backflush or disassemble the
mixer.
Viscous eluents in use Check eluent viscosity (the
observed pressure may be
normal for the column/eluent
blend). If necessary, change to
a less viscous eluent.
Defective pressure transducer Contact Waters Technical
Service.
Blocked outlet tubing or fluid
path (in pump outlet, detector,
column, or injector)
Locate the source of the
blockage. Clean or replace
tubing according to the appro-
priate operator’s guide.
Ambient temperature has
changed
Stabilize the operating
temperature.
Low pressure Pump flow rate set too low Set the correct flow rate.
Low-pressure limit set too high Set the low-pressure limit to
the correct value.
Eluent reservoir empty Fill the reservoir.
Air in eluent lines Prime the pump (see
Section 3.2.1,
Priming the
Pump).
Incorrect eluent used Use the correct eluent.
Leaks Carefully tighten any loose
fittings.
Ambient temperature has
changed
Stabilize the operating
temperature.
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