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6. Operating Characteristics
If the alarm senses dangerous levels of CO, the digital display will alternate between
"CO" and the measured CO concentration in parts per million (PPM), and the alarm
will emit an audible alarm pattern. This alarm will display a "0" if CO concentrations
between 0 and 30 PPM have been detected within the last 15 seconds.
When the unit is first powered up, the digital display will show three "eights" –
indicating the alarm is in the start-up mode. The three "eights" will remain for
approximately 5 seconds. After 5 seconds, the alarm should display "0" and begin
monitoring the air for CO and will continue to do so as long as it receives power.
The digital display will be brightly lit if the unit is in alarm, or in high light, and
then will become dim in the standby condition during low light conditions.
The following table illustrates the possible digital displays, describes the
audible alarm patterns, and the recommended actions to take.
Operating and Alarm Characteristics
LED Display Shows
An alternating display
of "CO" and the CO
concentration from
30-999.
"---" then "888"
Steady "0" displayed. None
Display alternates
between 'Lb" and
current CO level, (0-
999).
Steady "Err "displayed One quick
An alternating
display of
"PCO" and the CO
concentration (PPM)
No display. Green LED
flashes briefly once
every 60 seconds.
"End" displayed.
Red LED flashes
two times every 30
seconds
Alarm Sound Unit Status
4 quick beeps,
Alarm condition.
5 seconds
Dangerous
silence,
concentrations of CO
repeating
detected
4 quick beeps,
5 seconds
Self checking (Test
silence,
button was pressed)
repeated once
Normal AC operation
(sensing no CO) and
with a good battery.
One quick
AC powered and
beep every
in Low Battery
60 seconds
condition
Unit malfunction
beep every 30
seconds
None
Unit has detected
100ppm or more CO
Battery backup
None
operation. Unit
monitoring for CO.
2 quick beeps
End of unit life
every 30
seconds.
Recommendation
Refer to "What to do
When the Alarm
Sounds" (inside front
cover)
None – CO has not
been detected.
None
Replace alarm.
If "Err" continues, unit
has malfunctioned and
must be replaced
immediately.
Unit will not respond to
CO. Press the Peak Level
button while unit is in
"Err"mode to obtain error
code and call Product
Support line.
Push test/reset button,
check appliances
Verify AC power is
restored as soon as
possible to conserve
battery.
Replace unit immediately.
Refer to Section 2 for End
of Life Warning. See
Discharge section on next
page.
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