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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.
Display alternates between
'Lb" and current CO level,
(0-999).
Steady "Err "displayed
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 silence,
Dangerous concentrations
repeating
of CO detected
4 quick beeps,
Self checking (Test
5 seconds silence,
button was pressed)
repeated once
None
Normal AC operation
(sensing no CO) and with
a good battery.
One quick beep
AC powered and
every
in Low Battery
60 seconds
condition
Unit malfunction
One quick 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
Unit Life Warning and
Discharge section on the
next page.
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