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Low Battery Warning
If the 9 volt battery is missing, or if the battery’s power is low, an “Lb”
message will display which blinks alternately with the current CO read-
ing every second. If this happens, you need to replace the battery.
When you have a low battery installed, you will notice the following:
• A blinking dot will be displayed and the sounder will chirp every 15
seconds.
• The yellow LED will blink once every 15 seconds.
• The display will alternate between “Lb.” (low battery) and CO reading
while chirping.
When battery is depleted and the unit is not receiving AC mains power:
• A blinking dot will be displayed and the sounder will chirp approxi-
mately every 30 seconds.
• The yellow LED will flash approximately every 30 seconds.
• 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.
How to Test Your CO Alarm
You should test the alarm once a week, following the directions listed
below. If at any time you test the alarm and it does not perform as
described, have it replaced immediately.
Turn to “How to know if your alarm is malfunctioning” section for a
description of the characteristics of a malfunctioning alarm and what
you should do if a malfunction occurs.
Observe the alarm weekly to make sure the red dot is blinking, indicat-
ing normal operation.
If the dot is not blinking, unplug the alarm for three minutes, and then
plug it in again. This will clear the alarm for restart. If the dot does not
resume blinking, your alarm may be malfunctioning.
To test the alarm, press the Test/Reset button. If the unit is operating
properly, you should notice the following:
The unit will beep and the yellow LED will flash acknowledging the but-
ton was pressed and the self test has started. The display indicates
three eights, then displays a number (usually around 200). You should
then hear 8 seconds of quick beeps. The unit will then show the three
eights for several seconds. It will then return to monitoring for CO.
Familiarize yourself and household members with the alarm pattern
described above for a CO event.
Normal Operation
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