Thermo Scientific 42iQD, Instruction Manual

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Troubleshooting
Troubleshooting Guide
Thermo Scientific 42iQD Instruction Manual 6-3
Problem Possible Cause Action
Defective cooler Check temperature (less than -2
°
C at
T
amb
= 25
°
C).
Non-linear response Incorrect calibration
source Verify accuracy of multipoint
calibration source gas.
Leak in sample probe
line Check for variable dilution.
Excessive response time Partially blocked
sample capillary Unplug power cord. Clean or replace
capillary.
Hang up/blockage in
sample filter Change element.
Improper converter
operation Questionable
calibration gas Verify accuracy.
Converter
temperature too high
or too low Temperature should be approximately
325
°
C.
Low line voltage Check to see if line voltage is within
specifications.
Molybdenum
consumed Replace Molybdenum converter
cartridge.
Alarm – Instrument
Temperature Fan failure Replace fan if not operating properly.
Dirty fan filter Clean or replace filter.
Overheating PCB Locate defective PCB reporting the
error and replace if needed.
Alarm – Bench
Temperature Heaters failed Replace heaters as needed.
Defective PCB Replace PCB.
Alarm – Cooler Temp
Sensor Check fan operation Replace defective fan.
Check fan filter Clean or replace filter.
Bad thermistor Replace thermistor.
Alarm – NO
2
Converter
Temperature
Converter
temperature low Molybdenum converter should be hot
to the touch. If not, the heater may
have failed. Check that converter
temperature set point is
approximately 325
°
C.
Alarm – Pressure High pressure
indication Check plumbing for leaks.
Check the pump for a tear in the
diaphragm.
Replace if needed.