Labconco Purifier Axiom 30441 Technical Manual And Specifications page 162

Figure 10-4
If, after 30 seconds, the VSS still sees
insufficient vacuum, the exhaust alarm screen
is activated, and the alarm locks out,
requiring the blower button be pressed again
to attempt a blower restart. The screen is
shown in Figure 10-4.
If there is no red "V" on the alarm screen,
then there was insufficient airflow to open the
IRV. If the red "V" appears as shown, then
there was insufficient exhaust system vacuum
to close the VSS to allow the unit to properly start.
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