Messages Part 4. Fault messages
262
Fault 202—Hydrogen safety shutdown
An inlet configured for hydrogen gas did not reach the pressure setpoint within
2 minutes. Because hydrogen presents an explosion hazard, the following
occurred:
• The GC oven fan and heaters are turned off.
• The oven flaps are fully opened.
• Both pressure and flow controls are turned off and the control parameters
are flashing when viewed.
• The small zone heaters for inlets and detectors are turned off and the control
parameter are flashing when viewed.
• The warning beep continues until the [Clear] key on the keypad is depressed.
• The oven cannot be turned on unless the instrument is power failed. Turn
the GC power off and on again to restore operation.
The sequence would continue until the fault is fixed. To find the fault, check for
the following possible causes:
• Check the gas supply pressure. Increase the pressure at the initial supply if
it is too low to reach the setpoint.
• Check for a leak somewhere in the system. Leak test the gas supply tubing,
the inlet, and the inlet column fittings. Leak test procedures are found with
each inlet section.
• The column may be broken. Use the leak detector to check the column for
leaks and replace the broken column or break off the cracked portion.
• An inlet proportional control valve may be stuck open or closed because of
contamination or other fault. Contact your Agilent service representative.
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