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Troubleshooting
Troubleshooting Guide
6-2
146iQ Instruction Manual
Thermo Scientific
Problem
Possible Cause
Action
Micro
SD
Card
Programming
If Micro SD card was just replaced,
re-install the old one. If the
problem is fixed, request a
replacement Micro SD card.
Instrument temperature out
of range
Fan failure
Replace fan if not operating
properly.
Dirty fan filter
Clean or replace filter.
Overheating PCBA
Locate defective PCBA reporting
the error and replace if needed.
Voltage levels out of range
Poor PCBA or cable
connection
Locate PCBA where out of range
voltage level is being detected and
inspect connections. Replace PCBA
if damaged.
Solenoid current out of
range (option)
Sticking or damaged
solenoid
Reset solenoid via Settings>Health
Check>Status and Alarms>Valve
and Pump Resets screen. If
damaged, replace solenoid valve
block.
Pump current out of range
Damaged or dirty pump
Reset pump via Settings>Health
Check>Status and Alarms>Valve
and Pump Resets. Inspect and
refurbish pump. If pump motor is
damaged, replace pump.
Out of range pressure high
– upstream flow
Too much positive
pressure in sample line
Regulate line to lower pressure, or
install flow bypass near rear panel.
Out of range pressure low –
upstream flow
Ineffective pump
Evaluate for refit/replacement of
pump.
Internal leak
Inspect lines downstream of flow
capillary. Replace tubing if needed.
Stuck solenoid valve
(zero/span gas valve
option only)
Reset valve via Settings>Health
Check>Status and Alarms>Valve
and Pump Resets. Replace
manifold valve block if necessary.
Bench temperature out of
range
Thermistor
disconnected or shorted
Check to ensure range corresponds
with expected value. If not, select
proper range.
High:
Excessive
high
temperature in
instrument, duty cycle
of temperature control
at zero
Check external temperature (must
be under 45
°
C); check rear panel
fan for operation, replace if
necessary.
Low: Excessive low
temperature in
instrument, ineffective
or disconnected heater,
Check external temperature (must
be above 0
°
C); check heater
connection for disconnect or
crimps.
Summary of Contents for 146iQ
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