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Thermo Fisher Scientific
Alarm
Possible Cause
Message
Conc.
exceeded range limit
Concentration low
Alarm - Zero
Instrument out of
Check
calibration
Alarm - Span
Check
Alarm - Zero
Autocal
Alarm - Span
Autocal
Alarm -
Internal cables not
Motherboard
connected properly
Status
Alarm -
Board is defective
Interface Status
Alarm - I/O Exp
Status
Action
value. If not, select proper range.
Check user-defined low set point, be sure the
min trigger is set as desired.
Recalibrate instrument.
Check gas supply. Perform manual calibration.
Check that all internal cables are connected
properly. Recycle AC power to instrument. If still
alarming, change board.
Model 43i Trace Level-Enhanced Instruction Manual
Troubleshooting
Troubleshooting Guides
6-9
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Troubleshooting
