Normal Operating Characteristics
When you first power up the unit, the alarm will sound briefly to let you
know the unit is receiving power and that the alarm circuit is function-
ing.
You should see the green power light blink every 15 seconds when the
unit is on battery only power and on continuously when powered by
AC.
Within 20 seconds, your CO alarm will start monitoring for CO and will
continue to do so as long as it receives power.
When the alarm is unplugged or loses power and you have a good 9
volt battery installed, the alarm will automatically switch to its battery
backup mode and you will notice the following:
• The green power light will switch from being lit continuously to blink
every 15 seconds.
• If CO is detected while on battery backup, the alarm will produce a
pattern is continuous quick beeps for as long as the CO is present
or until the battery is depleted.
Note: When AC power is restored, the alarm will automatically switch
back to normal operating mode.
Low Battery Warning
If the 9 volt battery is missing, or if the battery’s power is low, the alarm
will beep as well as the red and yellow lights blinking once every 15
seconds. If this happens, you need to replace the battery.
When you have a low battery installed, you will notice the following:
• Red light blinks in unison with the alarm beeping every 15 seconds.
• The yellow light will blink once every 15 seconds.
When battery is depleted and the unit is not receiving AC mains power:
• Red light blinks in unison with the alarm beeping every 30-45 sec-
onds.
• The yellow light will flash approximately every 30-45 seconds.
• The green power light will not blink.
• Pressing the test button will not elicit any response.
The alarm will not detect CO if the battery is depleted. Replace the bat-
tery and plug the unit back into the AC outlet.
Constant exposures to high or low humidity may reduce battery life.
We recommend you replace your 9 volt battery at least every six
months.
Normal Operation
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