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39
Troubleshooting Guide
Problem
Possible Cause /
Corrective Action
No display or lights.
The power supply cord is not plugged
into the monitor or live AC outlet.
No audible alarm when
display shows Lo or Hi.
Audible alarm disabled. If horn slash
through icon is flashing, the horn has
been permanently disabled. Press
Test/Reset button for 5 seconds to re-
enable.
No audible alarm only when
display shows Hi.
High alarm disabled. See “Changing
Alarm Set Points” section to enable.
Pulsed audible alarm.
This indicates an external alarm. The
EXT descriptor on the LCD should
also be on. Attend to the external
alarm event. See Configuration
Parameter P08.
Nothing happens when the
Emergency Purge button is
pressed.
The emergency purge function is not
configured. See Configuration
Parameters P09 and P10.
Alarm does not activate
immediately.
Alarm does not come out of
alarm immediately when
good air flow is restored.
The alarm or clear condition must
exist for a predetermined time period
before it is interpreted as a true
event. See Configuration Parameters
P04 and P05 to set the transition
delays.
Monitor does not display the
expected air flows.
The blower speed has changed. User
a thermo-anemometer to perform a
traverse to check the true face
velocity;
The flexible air hose from the monitor
to the side wall sensing hole may be
kinked or bent, restricting the true air
flow. Reroute the hose and recheck
the connections at each end;
If the calibration of the monitor is
suspect, recalibrate as outlined in
Section 3.
