Troubleshooting 4-29
Pump not
delivering eluent
Draw-off valve open or
leaking
Close the draw-off valve. If eluent
still leaks, replace the valve (see
“Removing the draw-off valve” on
page 4-24).
Pump low-pressure limit
set higher than
operating pressure
Set to the correct low-pressure
limit.
Flow rate set to zero Set desired pump flow rate.
Pressure transducer out
of adjustment or
defective
With Flow parameter set to zero
and with no system backpressure,
set the Zero Pressure parameter.
If problem continues, contact
Waters Technical Service.
Pump not primed Prime the pump (see “Priming
the pump” on page 3-15).
Pump not connected to
external controller
Ensure cable is properly
connected to pump controller.
To avoid component damage,
never disconnect the pump from
the controller while the two
devices are powered on.
If pump operates properly, see
the controller operator’s manual
for troubleshooting information.
Troubleshooting error messages and pump malfunctions (Continued)
Symptom Possible cause Corrective action
Caution: To prevent eluent
from leaking out of the
pump outlet, make sure
you position the eluent
reservoir below the pump
inlet manifold before you
disconnect the pump outlet
fitting
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