Technical information

Troubleshooting
Doc. 065186-02 1/12 17
6. Troubleshooting
If you are unable to eliminate a problem by following the instructions here,
contact Technical Support for Dionex products before proceeding. In the U.S. and
Canada, call 1-800-346-6390. Outside the U.S. and Canada, call the nearest
Thermo Fisher Scientific office.
• Dionex VP fails to respond to relay commands
If the Dionex VP fails to turn on or off when the corresponding command is
executed, check the following:
a. Verify that the
RELAY CNTRL button on the Dionex VP rear panel is in the
OFF position (the button is not pressed in).
b. Verify that the appropriate relay output was assigned to control the pump
in the Server Configuration program (see Section 5.2
, Step 7).
• Dionex VP continuously emits a high-pitched noise
A liquid leak in the plumbing will allow air to flow into the Dionex VP,
prevent the pump from achieving a steady-state vacuum level, and produce a
high-pitched noise during operation.
a. Check all liquid line connections for leaks. Tighten fittings, or replace
tubing and fittings as required.
b. Tighten the ballast reservoir cap.