Troubleshooting
Troubleshooting Guide
Thermo Scientific
43iQ Instruction Manual
6-7
Problem
Possible Cause
Action
full-scale value or below
zero
under range on the analog
outputs is provided. If this is
not desirable due to system
restrictions, it may be turned
off in the
Settings>Communications>Ana
log I/O screen.
Recorder is drawing down
output
Verify that the recorder or data
logger input impedance meets
minimum requirements.
Flow meter fluctuations
Dirty pump diaphragm
Clean or replace pump
diaphragm.
Capillary blocked
Clean or replace capillary.
Clogged PTFE line
Inspect all sample lines.
Alarm – Chamber
Temperature
Heater failed
Replace heaters as needed.
Defective PCB
Replace PCB.
Alarm – Perm Gas Temp
Incorrect Perm oven set
temperature or alarm
setting
Check that the alarm settings
match the set temperature.
Perm oven heater
thermistor or gas thermistor
error
Replace thermistor.
Perm oven failure
Replace the Perm oven.
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
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