AirLink 7543 Gas Monitor Operator’s Manual
Chapter 7: Maintenance • 32
Troubleshooting
Table 2 describes symptoms, probable causes, and recommended actions for the most common
problems you may encounter with the AirLink 7543.
NOTE:
This troubleshooting guide describes AirLink 7543 problems only. See the detector head
operator’s manuals for preventive maintenance procedures that apply to the detector heads
installed on your AirLink 7543.
Table 2: Troubleshooting the AirLink 7543
Condition
Probable Causes
Recommended Action
F1
(Only for
AirLink T3A/
AirLink VOC
Pro/Air Alert
with Radio)
The top card has lost communication with the
digital sensor board (the board potted into the
sensor housing).
1. Check the connections and/or try
new digital sensor board.
F3
(battery powered
detector only)
The Low Power IR sensor is beyond repair.
1. Replace the IR sensor.
F4
• The top card is losing communication to
the analog sensor board
• On AirLink T3A/AirLink VOC Pro/Air
Alert (with radio) units, F4 means that the
Analog to Digital Conversion (ADC) on
the analog sensor board is not
communicating to the digital sensor
board.
• On the AirLink 6900, F4 means the top
card is not communicating with the
analog sensor board.
• For IR sensors, the sensor element itself
could be the issue. Also, there might not
be an issue because sometimes sensor
assemblies will show F4 for a few
seconds after boot up. This is normal and
is due to the boot up of the sensor element
itself.
1. Check the orientation of the analog
sensor board and/or try a new
analog sensor board.
2. Check the connections from the
top card all the way to the analog
sensor board. If that does not fix
the fault, try replacing the analog
sensor board and/or the sensor
housing.
F8
There are 2 sensor assemblies with the same
address trying to communicate with the
monitor.
1. Make sure all sensor assemblies
have unique addresses.
