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Thermo Scientific
Problem
Alarm – Pressure
Alarm – Flow
Alarm – Board
Communication
Alarm – Power Supply
Alarm – Module
Temperature
Possible Cause
Action
heater
replace heater if bad.
High bench pressure
Check the pump for a tear in the
indication
diaphragm; replace with pump
repair kit if necessary. Refer to
"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.
Flow low
Check sample capillary for blockage.
Replace as necessary.
If using sample particulate filter,
make sure it is not blocked.
Disconnect sample particulate filter
from the sample bulkhead. If flow
increases, replace the filter.
Perform a leak test as decribed on
page 5-5.
Flow high
When delivering zero air or gas to
the instrument, use an atmospheric
dump.
Flow = 0 LPM
Check that Step POL board #1 has
both dip switch settings of SW2 off
(both facing the rear of the
instrument). Verify the pump is
plugged into the Step POL board.
Worn Diaphragm
Rebuild pump every 12 months or as
needed.
Cable connection
Check that DMC cable is connected
properly. Reseat if needed.
Defective DMC PCB
Replace DMC board.
Cable connection
Check that DMC cable is connected
properly. Reseat if needed.
Defective component
Check for other alarms, as it is
possible that another component of
that DMC is drawing too much
current.
Defective DMC PCB
Replace DMC board.
Cable connection
Check that DMC cable is connected
properly. Reseat if needed.
Other alarm
Make sure the instrument
temperature is not too high or in
alarm.
Troubleshooting
Troubleshooting Guide
48iQ Instruction Manual
6-3
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