Agilent Technologies 6890 Series Service Manual page 565

850 Faults
Fault 226—Front detector thermal shutdown
Fault 226—Front detector thermal shutdown
Status message: F det temp sensor
The front detector temperature reading reports the detector's temperature is
lower than expected, which indicates a shorted sensor. Power will be turned
off for the detector.
The sensor must be replaced.
See Fault 221—Thermal shutdown (status message).
Fault 227—Back detector thermal shutdown
Status message: B det temp too hot
The back detector's temperature is higher than the maximum allowable
temperature (detector type maximum temperature plus an additional 25° C).
This indicates a defective heater drive on the mainboard or a defective sensor.
Power is disabled to the small zones and the oven. This fault can only be
cleared by turning off all the heated zones and turning the instrument off and
on again.
The problem could be caused by a defective sensor or defective heater
driver on the mainboard.
See Fault 221—Thermal shutdown (status message).
Fault 228—Back detector thermal shutdown
Status message: B det temp sensor
The back detector temperature reading reports the detector's temperature is
lower than expected, which indicates a shorted sensor. Power will be turned
off for detector.
The sensor must be replaced.
See Fault 221—Thermal shutdown (status message).
Fault 229—Front inlet thermal shutdown
Status message: F inl temp too hot
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Error Codes and Internal Diagnostics
Agilent 6890 Gas Chromatograph Service Manual
Jun 2001