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Troubleshooting
Troubleshooting Guide
6-4
42iQTL Instruction Manual
Problem
Alarm – Ozonator Flow
Alarm – NO, NO
, NO
2
x
Concentration
Alarm – Board
Communication
Alarm – Power Supply
Alarm – Module
Temperature
Alarm – 5V/24V Step Board
Alarm – Analog I/O
Alarm – Digital I/O
Possible Cause
Action
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.
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.
Ozone flow low
Check ozone capillary for blockage.
Replace as necessary.
Concentration has
Check to ensure range corresponds
exceeded range limit
with expected value. If not, select
proper range.
Check user-defined low set point;
set to zero.
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.
Defective DMC PCB
Replace DMC board.
Cable connection
Check the cable connections to
that Step POL board.
Defective PCB
Replace Analog board.
Defective PCB
Replace Digital board.
Thermo Scientific
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