Thermo Scientific 42iQHL Instruction Manual page 204

Troubleshooting
Troubleshooting Guide
6-4 42iQHL 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
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
exceeded range limit corresponds 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.
Thermo Scientific