Waters 2475, Operator'S Manual, Page: 160 / 228

5-2 Error Messages, Diagnostic Tests, and Troubleshooting
Startup error messages
Startup diagnostic tests verify the proper operation of the electronics. If one or
more of the internal diagnostic tests fails, the detector beeps and displays an
error message. For serious errors, <Error> appears on the home screen
instead of the runtime.
Tip:
To prevent errors at startup, be sure the flow cell contains degassed
transparent solvent (methanol or water) flowing at 1 ml/min, and the
front-left-hand panel cover is attached securely.
The following table lists the startup messages with descriptions and corrective
actions in alphabetical order. “Wavelength verification and test” on page 1-14 ,
“Verifying the detector” on page 3-34 , and “Manual wavelength calibration” on
page 3-35 have verification and calibration information and procedures.
Startup error messages
Error message Description Corrective action
Calibration differs: n.n
nm
At startup, the unit
performs a complete
verification and
measures all
calibration points. New
calibration points are
compared to stored
points from the most
recent manual
calibration. This
message appears when
any point differs by
more than 2.0 nm.
• Cycle power (shut
down, wait 10
seconds, then
restart).
• Perform manual
calibration.
• Contact Waters
Technical Service.
Calibration not found Stored calibration data
not valid.
Perform manual
calibration procedure.
Calibration
unsuccessful: Peak out
of range n.n nm
Results of a calibration
operation outside of
specification. Unit uses
previously stored
calibration.
• Flush flow cell with
water.
• Replace lamp.