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Part 2. Shutdown messages Messages
Shutdown 1—Oven shut off
The power required to keep the oven at setpoint exceeds the expected power
for that temperature. The GC becomes not ready. The oven flaps open half-way
(if they are operating correctly). Turn the GC off and then on again or change
the oven temperature to restore operation. Possible causes include:
• Malfunctioning oven flap. Check the oven flap on the back of the GC. It
should be open when cooling (for temperatures between 50 and 250°C) or
closed completely to reach temperature setpoints. If the flap is stuck
completely or partially open, it is not operating correctly. Contact your
Agilent service representative.
• Look for thermal leaks in the oven (for example, missing insulation around
an inlet or detector location or a leak in the door).
• Check for excessive load in the oven (for example, a very large packed
column).
• The oven heater or the heater electronics are not operating correctly.
Contact your Agilent service representative.
Shutdown 2—Oven cryo shutdown
The GC oven has shut down. Cryogenic shutdowns conserve 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 oven has reached its
temperature setpoint but the amount of time you specified for the cryo time-
out setpoint has elapsed without a run beginning.
Turn the oven 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 oven 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
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