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CHAPTER 9: Troubleshooting Guide
Problem... If the CO Alarm... You Should...
The BATTERY light turns
YELLOW. It flashes and the
horn “chirps” twice a minute.
Low battery warning. Install a new 9V alkaline or lithium battery*.
Horn chirps and yellow service
light blinks three times every
30 seconds.
Device is not working
properly, and needs to be
replaced.
Units under warranty should be returned to
manufacturer for replacement. See “Limited
Warranty” for details. (Back Cover)
During testing, when you
press and hold the Test/Silence
button, the BATTERY light
turns YELLOW
Low battery Install a new 9V alkaline or lithium battery*.
Carbon Monoxide Alarm Only
CO alarm goes back into
alarm 4 minutes after you
press the Test/Silence button.
CO levels indicate a
potentially dangerous
situation.
IF YOU ARE FEELING SYMPTOMS OF CO
POISONING, EVACUATE your home and call 911
or the Fire Department. If not, press the Test/
Silence button again and keep ventilating your
home.
CO alarm sounds frequently
even though no high levels of
CO are revealed in an
investigation.
The alarm may be
improperly located. Refer
to “Where to Install This
Alarm.” (Page 5)
Relocate your alarm. If frequent alarms continue,
have home rechecked for potential CO problems.
You may be experiencing an intermittent CO
problem.
Smoke Alarm Only
Smoke alarm sounds when no
smoke is visible.
Unwanted alarm may be
caused by non-
emergency source like
cooking smoke.
Clean the alarm’s cover with a soft, clean cloth.
If frequent unwanted alarms continue, relocate
your alarm. Alarm may be too close to a kitchen,
cooking appliance, or steamy bathroom.
*For a list of acceptable replacement batteries, see “Regular Maintenance.” (Page 15)
If you have questions that cannot be answered by reading this manual, call Consumer Affairs at 1-800-323-9005.