Troubleshooting
Troubleshooting Guides
Thermo Electron Corporation Model 48i Instruction Manual 6-3
Table 6-2. Troubleshooting - Alarm Messages
Alarm Message Possible Cause Action
Alarm - Internal Temp Check fan operation Replace fan if not operating
properly.
Check fan filter Clean or replace foam filter,
refer to “Preventive
Maintenance” chapter in
this manual.
Alarm - Chamber Temp Chamber temperature below set
point of 50 °C
Check 10K thermistor,
replace if bad.
Check temperature control
board to insure the LEDs are
coming on. If not,
temperature control board
could be defective.
Alarm - Pressure High pressure indication Check the pump for a tear in
the diaphragm, replace with
pump repair kit if necessary.
Refer to “Preventive
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
(0.015 inch ID) 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.
Alarm - Bias voltage Defective measurement interface
board
Replace measurement
interface board.
Defective pre-amp board Replace pre-amp board.
Alarm - AGC intensity Pre-amp Gain not set properly Check Gain adjustment.
Defective measurement interface
board
Replace measurement
interface board.
Alarm - Motor Speed Defective measurement interface
board
Replace measurement
interface board.
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