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Troubleshooting
Troubleshooting Guide
Thermo Scientific
42iQHL Instruction Manual
6-5
Problem
Possible Cause
Action
Alarm – Analog I/O
Defective PCB
Replace Analog board.
Alarm – Digital I/O
Defective PCB
Replace Digital board.
Alarm – NO Bkg Check
Offset
Incorrect high alarm limit
Verify the high limit is correct via
Settings>Status and
Alarms>Concentrations screen.
Instrument
background
calibration failed
Recalibrate the instrument.
Alarm – NO Span Check
Offset
Incorrect high alarm limit
Verify the high limit is correct via
Settings>Status and
Alarms>Concentrations screen.
Instrument
span
calibration failed
Recalibrate the instrument.
Alarm – Ambient
Thermistor
Defective Flow/Pressure
board
Replace defective DMC board as
needed.
Alarm – Chamber Pressure
Defective Flow/Pressure
board
Replace defective DMC board as
needed.
Alarm – Bench
Temperature Short
Cable connection
Check the cable connection from
the heater to the DMC board.
Broken wire
Verify the wires are properly
connected to both sides of the
heater.
Defective heater
Replace heater as needed.
Defective DMC board
Replace defective DMC board as
needed.
Alarm – Bench
Temperature Open
Cable connection
Check the cable connection from
the heater to the DMC board.
Broken wire
Verify the wires are properly
connected to both sides of the
heater.
Defective heater
Replace heater as needed.
Defective DMC board
Replace defective DMC board as
needed.
Alarm – Cooler Current too
Low
Defective cooler
Replace cooler as needed.
Defective DMC board
Replace DMC board as needed.
Alarm – Cooler Current too
High
Defective cooler
Replace cooler as needed.
Defective DMC board
Replace DMC board as needed.
Alarm – Cooler Voltage too
Low
Defective cooler
Replace cooler as needed.
Defective DMC board
Replace DMC board as needed.
Summary of Contents for 42iQHL
Page 1: ...42iQHL Instruction Manual High Level NO NO2 NOx Analyzer 119018 00 27Sep2018 ...
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