Kidde 900-0235 User Manual page 13

6. The 900-0235 Operating Characteristics
When the 900-0235 CO alarm loses power: If you have a good 9V battery
installed, the alarm will automatically switch to the battery backup mode and
the green LED will flash approximately every 10 seconds. The unit will continue
to operate normally and detect CO for at least 20 hours.
If the battery is low or missing, or if the unit malfunctions, it will alarm
differently to alert you of specific conditions. Please familiarize yourself, and
other family members, of the difference between a CO alarm and an
indication signifying a problem with the unit.
When AC power is restored, the alarm will automatically switch back to
normal operating mode and the green LED will come on continuously.
Observe the CO alarm regularly to make sure the green Operate LED is on,
indicating normal operation. If the green Operate LED is not on, unplug the
CO alarm, then plug it in again. This will clear the alarm for restart. If the
green operate LED does not light, your CO alarm may be malfunctioning.
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 7 seconds
Carbon Red LED flashes with
monoxide beeps.
alarm
Low Red LED flashes every
battery 15 seconds
Error/ alarm
service Red LED flashes every
Error Red LED
constantly on
Normal Red LED flashes with
Test/Reset beeps. Green and
function amber LED's on
Alarm Sound Unit Status
None Normal AC
operation (sensing no
CO) and with a good
battery
None Normal DC operation
on 9V battery backup
4 quick beeps, Alarm condition.
5 seconds silence, Dangerous
repeating concentrations of CO
detected
One quick beep AC powered and low
every 15 seconds or missing battery
30 seconds Unit is in error condition
One quick beep
every 30 seconds
Constant alarm Very low battery or unit
malfunction
4 quick beeps, Normal operation when
5 seconds silence, Test/Reset button is
repeated once pressed
Recommendation
None
Verify AC power is
restored as soon as
possible to conserve
battery. Replace battery.
Refer to "What to do
When the Alarm Sounds"
(inside front cover)
Install or replace 9V
battery.
Replace battery.
If "Err" continues, unit
has malfunctioned.
Replace immediately. Unit
will not respond CO
CO not detected. Alarm
for test purposes only