Agilent Technologies 6890 Series Service Manual page 562

Faults 850
Fault 220—Heater over current. Thermal shutdown
The fault could be caused by a malfunction in the heater sensor or the
heater electronics.
See Fault 221—Thermal shutdown (status message).
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Error Codes and Internal Diagnostics
Jun 2001
Agilent 6890 Gas Chromatograph Service Manual