Operating and Alarm Characteristics
LED Display Shows Alarm Sound Unit Status Recommendation
“---” then “888”.
Escape light briefly lit.
An alternating display of
“CO” and the
CO concentration from 30-999.
Escape light is on.
4 quick beeps,
5 seconds silence,
repeated once
Self checking (Test
button was pressed)
None – CO has not been
detected.
Steady “0” displayed.
None Normal AC operation
(sensing no CO) and with
a good battery.
None
Display alternates between
‘Lb” and current CO level,
(0-999)
One quick beep
every
60 seconds
AC powered and
in Low Battery
condition
Replace alarm.
Steady “Err “displayed One quick beep
every 30 seconds
Unit malfunction
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.
No display. Green LED
flashes briefly once
every 60 seconds.
None Battery backup
operation. Unit
monitoring for CO.
Verify AC power is restored
as soon as possible to
conserve battery.
6. Operating Characteristics
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
Night light, in low light conditions with AC applied, will illuminate.
The following table illustrates the possible digital displays, describes the
audible alarm patterns, and the recommended actions to take.
“End” displayed. Red
LED flashes two times
every 30 seconds
2 quick beeps
every 30 seconds.
End of unit life
Replace unit immediately.
Refer to Section 2 for
End of Life Warning and
Discharge section on the
next page.
An alternating display
of “PCO” and the CO
concentration (PPM)
None Unit has detected
100ppm or more CO
Push test/reset button,
check appliances
Alarm condition.
Dangerous
concentrations of CO
detected
4 quick beeps, 5
seconds silence,
repeating
Refer to “What to do
When the Alarm Sounds”
(inside front cover)
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