Troubleshooting
Troubleshooting Guide
Thermo Scientific
43iQHL Instruction Manual
6-7
Problem
Possible Cause
Action
Defective PCB
Replace PCB.
Alarm – Pressure
High pressure indication Check plumbing for leaks.
Check the pump for a tear in the
diaphragm. Replace if needed.
Check that the capillary is properly
installed and o-rings are in good
shape.
Alarm – Flow
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
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.
Alarm – Intensity
Low – Lamp is failing
Check that the lamp and trigger
pack are securely fastened.
Replace lamp.
Alarm – Lamp voltage
Low voltage (<600v)
Replace lamp power supply.
High voltage (>1400v)
Replace flash lamp.
Alarm – SO
2
Conc.
Concentration has
exceeded range limit
Check to ensure range corresponds
with expected value. If not, select
proper range.
Concentration low
Check user-defined low set point.
Be sure the minimum trigger is set
as desired.
Alarm – Board
Communication
Cable connection
Check that DMC cable is connected
properly. Reseat if needed.
Defective DMC PCB
Replace DMC board.
Alarm – Power Supply
Cable connection
Check that DMC cable is connected
properly. Reseat if needed.
Summary of Contents for 43iQHL
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