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If the battery is low or missing, or if the unit malfunctions, it will display
other readings (and alarm differently) to alert you of specific conditions.
Please familiarize yourself, and other family members, to the difference
between a CO reading and and indication signifying a problem with the
unit itself.
NOTE: When AC power is restored, the alarm will automatically switch
back to normal operating mode.
The alarm will not detect CO or gas if battery is depleted. Replace bat-
tery.
The following table illustrates the possible digital displays, describes the
audible alarm patterns, and the recommended actions to take.
6. Model KN-COEG-3 Operating Characteristics
Operating and Alarm Characteristics
LED Display Shows Alarm Sound Unit Status Recommendation
Brief “888” along
with any number
between 100 and 300.
4 quick beeps,
5 seconds
silence,
repeated once
Self checking when
AC powered (Test
button was pressed
or unit was first
powered)
None – CO has not
been detected.
Numbers shown for
test purposes only
Steady “0” displayed. None Normal AC
operation (sensing
no CO) and with a
good battery
None
A display of CO
concentration from
30-999.
4 quick beeps,
5 seconds
silence,
repeating
Alarm condition.
Dangerous
concentrations of
CO detected
Refer to “What to do
When the Alarm
Sounds” (inside front
cover)
“Lb” flashes
alternately with
any number.
One quick
beep every
15 seconds
AC powered and
low or missing
battery
Install or replace 9V
battery
Steady “Err displayed One quick
beep every
30 seconds
Unit malfunction Replace battery.
If “Err” continues,
unit has malfunc-
tioned. Replace
immediately. Unit will
not respond CO
No display alternating
with display of CO
concentration every 60
seconds.
4 quick beeps,
5 seconds
silence,
repeating
every 60 secs
Alarm condition
powered on battery
backup. Dangerous
concentrations of
CO detected
Refer to “What to do
When the Alarm
Sounds” (inside front
cover).
Replace battery
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