Troubleshooting 4-31
Pump not
delivering eluent
(continued)
Defective pump motor Contact Waters Technical
Service.
Defective circuit board Contact Waters Technical
Service.
Leak from pump
head
Worn pump plunger
seals
Replace defective plunger seals
(see “Cleaning and replacing
seals and plungers” on page 4-9).
Worn plunger Replace the plunger (see
“Cleaning and replacing seals and
plungers” on page 4-9).
Loose pump head Tighten the two pump head
screws. Ensure that both screws
are tightened equally, otherwise
seal wear may result. Do not
overtighten.
Loose inlet or outlet
check valve
Tighten the loose check valve(s).
Do not overtighten.
Check fittings and ferrules for
wear. Replace if necessary.
Leak from draw-off
valve
Draw-off valve open or
broken
Close the draw-off valve. If leak
continues, replace the valve
(see“Replacing the draw-off
valve” on page 4-24).
Erratic flow
rate/pump
pulsations
Eluent improperly
degassed or sparged
Degas or sparge the eluent and
reequilibrate the system.
Pump not primed Prime the pump. If you are using
a volatile eluent (such as hexane),
prime the pump with a miscible,
less volatile eluent such as THF
or methanol. Ensure that the
column is disconnected to avoid
disrupting equilibrium.
Troubleshooting error messages and pump malfunctions (Continued)
Symptom Possible cause Corrective action
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