AirLink 9850 Gas Monitor Operator’s Manual
Chapter 7: Troubleshooting • 37
Chapter 7: Troubleshooting
Table 2 describes symptoms, probable causes, and recommended actions for the most common
problems you may encounter with the AirLink 9850.
NOTE:
This troubleshooting guide describes AirLink 9850 problems only. See the detector head
operator’s manuals for preventive maintenance procedures that apply to the detector heads
communicating with your AirLink 9850.
Table 2: Troubleshooting the AirLink 9850
Condition
Probable Causes
Recommended Action
F1
(Only for
AirLink T3A/
AirLink VOC
Pro)
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 AirLinkT3A/AirLink VOC Pro
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.
