Table 6-2. Troubleshooting - Alarm Messages - Thermo Scientific 42i Instruction Manual

Troubleshooting
Troubleshooting Guides
6-4 Model 42i 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 - Perm Gas Temp Incorrect Perm oven set
temperature or alarm settings
Perm oven heater thermistor or
gas thermistor is out of
calibration
Perm oven failure
Alarm - Pressure High pressure indication
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 that the alarm settings
match the set temp.
Calibrate the thermistor.
Replace the Perm oven.
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.
Thermo Fisher Scientific