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Troubleshooting
Troubleshooting Guide
6-2
49iQ Instruction Manual
Problem
Possible Cause
Micro SD Card
Programming
Instrument
Fan failure
temperature out of
range
Dirty fan filter
Overheating PCBA
Voltage levels out of
Poor PCBA or cable
range
connection
Solenoid current out
Sticking or damaged
of range (option)
solenoid
Pump current out of
Damaged or dirty pump
range
Out of range pressure
Too much positive pressure
high – upstream flow
in sample line
Out of range pressure
Ineffective pump
low – upstream flow
Internal leak
Stuck solenoid valve
(zero/span gas valve option
only)
Bench temperature
Thermistor disconnected or
out of range
shorted
High: Excessive high
temperature in instrument,
duty cycle of temperature
control at zero
Low: Excessive low
temperature in instrument,
ineffective or disconnected
heater, duty cycle
temperature at 100%
Action
If Micro SD card was just replaced,
re-install the old one. If the problem
is fixed, request a replacement Micro
SD card.
Replace fan if not operating properly.
Clean or replace filter.
Locate defective PCBA reporting the
error and replace if needed.
Locate PCBA where out of range
voltage level is being detected and
inspect connections. Replace PCBA if
damaged.
Reset solenoid via Settings>Health
Check>Status and Alarms>Valve and
Pump Resets screen. If damaged,
replace solenoid valve block.
Reset pump via Settings>Health
Check>Status and Alarms>Valve and
Pump Resets. Inspect and refurbish
pump. If pump motor is damaged,
replace pump.
Regulate line to lower pressure, or
install flow bypass near rear panel.
Evaluate for refit/replacement of
pump.
Inspect lines downstream of flow
capillary. Replace tubing if needed.
Reset valve via Settings>Health
Check>Status and Alarms>Valve and
Pump Resets. Replace manifold valve
block if necessary.
Check to ensure range corresponds
with expected value. If not, select
proper range.
Check external temperature (must be
under 45 °C); check rear panel fan for
operation, replace if necessary.
Check external temperature (must be
above 0 °C); check heater connection
for disconnect or crimps.
Thermo Scientific
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