Kidde KN-COB-DP2CA User Manual page 13

6. Operating Characteristics
When the CO alarm loses AC power: If you have two good AA
batteries installed, the alarm will automatically switch to the battery
backup mode and the green LED will flash approximately every 60
seconds. The unit will continue to operate normally and detect CO.
When AC power is restored, the alarm will automatically switch back
to normal operating mode and the green LED will stay lit continuously.
When the CO alarm is unplugged: If the Tamper Resist feature is
"ON" and the unit is unplugged it will produce a constant tone until a
battery is removed, Tamper Resist disabled or the unit is plugged back
into the wall. If Tamper Resist feature is in "OFF" position and unit is
unplugged, it will operate as if on battery backup only. Plug unit back
into AC as soon as possible.
Observe the CO alarm regularly to make sure the green Power LED is
on, indicating normal operation.
If the green Power LED is not on, unplug the CO alarm, then plug it in
again. This will clear the alarm for restart. If the green Power LED does
not light, your CO alarm may be malfunctioning.
Event Memory: If the unit has detected a CO concentration of
100 ppm or greater, the green LED will flash every 10 seconds. Pushing
the Test button will clear the Event Memory and initiate the test
sequence.
When the CO alarm detects an error condition: If the unit
detects an internal error or malfunction, it will produce one beep
every 30 seconds with a red LED flash. If error condition continues,
replace the CO alarm immediately. Unit will not respond to CO in this
condition.
The following table describes the audible alarm patterns and the
recommended actions to take.
Operating and Alarm Characteristics
Function LED Display
Normal Green LED
Operation constantly on
Normal Green LED flashes
Operation every 60 seconds
Carbon Red LED flashes with
monoxide beeps.
alarm
Low Red LED flashes every
battery 60 seconds
Alarm Sound Unit Status
None Normal AC
operation (sensing no
CO) and with a good
battery
None Normal DC operation
on battery backup
4 quick beeps, Alarm condition.
5 seconds silence, Dangerous
repeating concentrations of CO
detected
One quick beep AC powered and low
every 60 seconds or missing batteries
Recommendation
None
Verify AC power is
restored as soon as
possible to conserve
battery. Replace batteries.
Refer to "What to do
When the Alarm Sounds"
(inside front cover)
Install or replace two AA
batteries.