Waters Alliance e2695 Operator's Manual page 177

8.5.4.2 Solvent management system troubleshooting
The following table provides troubleshooting suggestions for solvent management system
problems in the separations module.
Table 8–11: Solvent management system troubleshooting
Symptom
Plunger head leaks solvent
Erratic flow/pressure
pulsations
Possible cause
Worn plunger seals
Worn seal wash seals
Loose head
Loose inlet check valve
Defective face seals
Seal wash tubes not properly
installed
Gas dissolved in mobile phase Degas solvents.
Air bubble in head
Dirty inlet check valves
Prime/vent valve open or
leaking
Plugged solvent reservoir
diffuser
Plunger seal leaking
February 27, 2018, 715003794 Rev. C
Page 177
Corrective action
Replace plunger seals (see
"Notes on replacing the
plunger seals" on page
Replace seal wash seals (see
"Replace the seal wash
assembly seals" on page
Hand-tighten head nut.
Tighten the check valve.
Replace face seals.
Install tubes properly.
Prime solvent management
system to remove bubble.
Increase the degassing time
before use. Set the bubble
detect alarm in the Mobile
Phase screen (see "Set Mobile
Phase screen parameter
values" on page 94).
Loosen the check valve for a
few strokes and see if it starts
flowing properly. You can also
try cleaning the check valves
by running wet prime. To
replace inlet check valves (see
"Replace an inlet check valve
cartridge" on page 129).
Close or rebuild prime/vent
valve.
Clean or replace diffuser.
Make sure that seal wash is
primed and operating properly.
Replace plunger seal
assembly (see "Notes on
replacing the plunger seals" on
page 124).
124).
126).