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Part 2. Shutdown messages Messages
Shutdown 20—Aux 1 cryo shutdown
Shutdown 21—Aux 2 cryo shutdown
The Auxiliary temperature zone equipped with cryo cooling has shut down. A
cryogenic shutdown conserves liquid coolant when the GC is unable to start a
run. A cryo shutdown does not mean that the cryogenic cooling system is
malfunctioning. Instead, one of the following could be the cause:
• A “cryo timeout” has occurred. This happens if the GC Aux zone has reached
its temperature setpoint but the amount of time you specified for the cryo
timeout setpoint has elapsed without a run beginning.
Turn the zone off and then on again or change the setpoint to restore normal
operation. Then turn the timeout option off to prevent another shutdown or
lengthen the timeout period.
• A “cryo fault” has occurred. Cryogenic cooling has been on for over
16 minutes but the Aux zone has not reached its temperature setpoint.
Check the level of the cryogenic fluid and replace the supply if it is too low
for proper cooling. The cryo valve may be stuck open or closed. If your fluid
supply is adequate, the valve may be broken or the electronics driving it may
be malfunctioning (this is a less likely cause). Contact your Agilent service
representative.
Shutdown 22—Front inlet heating too slowly:
temperature shut off
Shutdown 23—Back inlet heating too slowly:
temperature shut off
The inlet heater has been full on for a long time but the inlet temperature is not
at setpoint. Either the temperature sensor for the zone has failed, or the zone’s
heater is defective.
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