Troubleshooting
Troubleshooting Guide
Thermo Scientific
42iQ Instruction Manual
6-5
Problem
Possible Cause
Action
Alarm – Module
Temperature
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.
Alarm – 5V/24V Step Board
Cable connection
Check the cable connections to that
Step POL board.
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.
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