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Troubleshooting
Troubleshooting Guides
6-4
Model 42i Trace Level Instruction Manual
Table 6–2. Troubleshooting - Alarm Messages
Alarm Message
Possible Cause
Alarm - Internal Temp
Check fan operation
Check fan filter
Alarm - Chamber Temp
Chamber temperature below set
point of 50 °C
Alarm - Cooler Temp
Check fan operation
Check fan filter
Cooler reads 80 °C
Bad cooler
Cooler does not hold set point
of -3 °C
Cooler reads -20 °C
Alarm - Conv. Temp
Converter temperature low
Alarm - Pressure
High pressure indication
Alarm - Flow
Flow low
Action
Replace fan if not operating
properly.
Clean or replace foam filter,
refer to "Preventive
Maintenance" chapter in this
manual.
Check 10K ohm thermistor,
replace if bad.
Check temperature control
board to insure the LEDs are
coming on. If not, temperature
control board could be
defective.
Replace defective fan.
Clean or replace foam filter.
Replace cooler.
Replace cooler –
thermoelectric module inside
cooler failed.
Replace cooler – thermocouple
bad.
Molybdenum converter should
be hot to the touch, if not the
heater may have failed. Check
that converter temp. set point
is approximately 325 °C. Check
that voltage to the heater is
115 VAC.
Check the pump for a tear in
the diaphragm, replace with
pump repair kit if necessary.
Refer to "Preventive
Maintenance" chapter in this
manual. Check that capillaries
are properly installed and O-
rings are in good shape.
Replace if necessary. Check
flow system for leaks.
Check sample capillary (0.020
inch ID) for blockage. Replace
as necessary.
If using sample particulate
filter make sure it is not
Thermo Fisher Scientific
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Troubleshooting
