Thermo Scientific 48iQTL, Instruction Manual

Page: 169 / 280

Troubleshooting
Troubleshooting Guide
Thermo Scientific 48iQTL Instruction Manual 6-3
Problem Possible
Cause Action
Dirty fan filter Clean or replace filter.
Overheating PCB Locate defective PCB reporting the error
and replace if needed.
Alarm – Bench Temperature Defective bench
heater Check 10K ohm thermistor and replace
heater if bad.
Alarm – Pressure High bench
pressure
indication Check the pump for a tear in the
diaphragm; replace with pump repair kit
if necessary. Refer to “
Maintenance ”
chapter in this manual.
Check that capillaries are properly
installed and o-rings are in good shape.
Replace if necessary.
Check flow system for leaks.
Alarm – Flow Flow low Check sample capillary for blockage.
Replace as necessary.
If using sample particulate filter, make
sure it is not blocked. Disconnect sample
particulate filter from the sample
bulkhead. If flow increases, replace the
filter.
Perform a leak test as decribed on page
5-5 .
Flow high When delivering zero air or gas to the
instrument, use an atmospheric dump.
Flow = 0 LPM Check that Step POL board #1 has both
dip switch settings of SW2 off (both
facing the rear of the instrument). Verify
the pump is plugged into the Step POL
board.
Worn
Diaphragm
Rebuild pump every 12 months or as
needed.
Alarm – Board
Communication Cable
connection Check that DMC cable is connected
properly. Reseat if needed.
Defective DMC
PCB
Replace DMC board.
Alarm – Power Supply Cable
connection Check that DMC cable is connected
properly. Reseat if needed.
Defective
component
Check for other alarms, as it is possible
that another component of that DMC is
drawing too much current.
Defective DMC
PCB
Replace DMC board.