If you cannot resolve the issue, use the service tool to read the error log files or use the
service tool to perform a functional test
1
on the module reporting the message.
CO2 messages
Message Possible cause Suggested action
CO2 not functional. Call for service. A nonrecoverable communications error has
occurred
Check the error logs for CO2
errors. See the service tool help
files for details on specific errors
and suggested actions.
Check with Welch Allyn for
software updates.
Filter line disconnected. The sampling line is not connected to the monitor Connect a sampling line to the
monitor.
Check to ensure that the
sampling line plug is tightly
connected to the monitor.
The sampling line is defective Replace the sampling line.
The input connector is dirty Clean the input connector. See
the appendices for instructions.
The sampling line detection switch is faulty Replace the module.
Occlusion in gas line. (High-priority
alarm)
The purge cycle failed to clear a blockage in the
sampling line
Replace the sampling line.
The purge cycle failed to clear a blockage inside
the module
Replace the module.
CO2 temperature out of range. CO2
is not calibrated.
CO2 module temperature is out of range Wait for the module temperature
to return to normal and the
module to reset before
calibrating CO2.
Move to a location where the
ambient temperature enables the
module temperature to return to
normal and the module to reset
before calibrating CO2.
Connect or clear filter line. Calibration failed because sampling line is
blocked or kinked
Check sampling line for
obstruction or kinks. Replace the
sampling line if necessary.
Module is not ready for calibration because the
sampling line is not connected to the monitor
Check to ensure that the
sampling line plug is tightly
connected to the monitor.
Purging filter line. An occlusion was detected in the sampling line,
which automatically initiated a purge cycle
Wait for the purge cycle to clear
the blockage and the module to
be reset.
1
Requires the service tool, Gold edition.
Service manual Troubleshooting 41
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