Use and Care Manual
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 C3010 Operating Characteristics
Operating and Alarm Characteristics
Function LED Display Alarm Sound Unit Status Recommendation
Normal
Operation
Green LED 
flashes every 30 
seconds
None Normal 
operation
Carbon 
monoxide 
alarm
Red LED flashes 
with beeps. 
4 quick beeps, 5 
seconds silence - 
continuous for first 
4 minutes then 2 
patterns once a 
minute there after
Alarm condition.
Dangerous concentra-
tions of CO detected
Refer to “What to do 
When the Alarm Sounds” 
(inside front cover)
Low 
battery
Amber LED flashes 
every second 
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
If unit is cold, allow to warm 
up above 68°F. If the unit is 
at room temperature and is 
beeping /flashing every 60 
seconds the unit needs to be 
replaced.
Error / 
Service alarm
Amber LED flashes 
every second green 
LED blinks error 
code every other 
30 seconds.
quick beep every 
30 seconds
Unit is in error 
condition
Error
 Constant 
Tone
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 
and Green LED 
on. Amber on at 
button press and 
temporal pattern
 4 quick beeps, 5 
seconds silence 
– repeated once 
(1st at reduced 
level,2nd at full 
volume )
Normal operation 
when Test/Reset 
button is pressed
CO not detected. Alarm 
for test purposes only
End of unit 
life indicator
Amber LED flashes 
every second and 
green LED blinks 
error code every 
other 30 seconds.
Sequence of two 
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 C3010-D (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.
None
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