Whenever the alarm is operating, the green Power LED flashes every 30
seconds to indicate the unit is monitoring for CO. If the alarm senses
dangerous levels of CO, the red Alarm LED will flash and the alarm will
emit an audible alarm pattern.
5. Model 8LLCO Operating Characteristics
Operating and Alarm Characteristics
Function
LED Display
Alarm Sound
Unit Status
Recommendation
Normal
Operation
Green LED
flashes every 30
seconds
None
Normal DC
operation (sensing
no CO) and with
good batteries
None
Carbon
monoxide
alarm
Red LED flashes
with beeps.
4 quick beeps,
5 seconds
silence,
repeating
Alarm condition.
Dangerous con-
centrations of CO
detected
Refer to “What to
do When the Alarm
Sounds” (inside front
cover)
Low
battery
Red LED flashes
every 60 seconds
One quick
beep every
60 seconds
Unit batteries are not
capable of powering
the unit either because
of age, storage or the
voltage of the battery.
Error /
service
alarm
Red LED flashes
every 30 seconds
One quick
beep every
30 seconds
Unit is in error
condition
Error
Red LED
constantly on
Constant
alarm
Very low battery or
unit malfunction
Press and hold the test button for
5 seconds to perform a reset. If
unit continues to beep or alarm,
using a screwdriver slide the
switch on the back of the unit up
to the shut down position.
Unit will not respond to CO.
Normal
Test/Reset
function
Red LED flashes
with beeps.
4 quick beeps,
5 seconds
silence,
repeated once
Normal operation
when Test/Reset
button is pressed
CO not detected.
Alarm for test pur-
poses only
End of
unit life
indicator
Red LED flashes
two times
every 30 seconds
Two quick
beeps every
30 seconds
End of unit life
Replace unit immediately.
Using a screwdriver slide the
switch on the back of the
unit up to the shut down
position.
Unit will not respond to CO.
6. Model 8LLDCO (with digital display)
Operating
Characteristics
When the unit is first powered up, the green Operate LED flashes
once every 30 seconds and the digital display will show three “eights”
– indicating the alarm is in the start-up mode. The three “eights” will
remain for approximately 30 seconds. Then, the alarm will display “0”
and begin monitoring the air for CO and will continue to do so as long
as it receives power.
This alarm will display a “0” if CO concentrations between 0 and 30
PPM have been detected within the last 15 seconds.
If unit is cold, allow to warm up
above 20°C. If the unit is at room
temperature and is beeping/
flashing every 60 seconds the unit
needs to be replaced.
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