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CHAPTER 3:
If Your Smoke/CO Alarm Sounds
WHAT TO DO FIRST—IDENTIFY THE TYPE OF ALARM
Type of alarm: The Alarm is... This means... You should...
Carbon Monoxide CO Light:
Flashing RED
Horn: 4 beeps —
silence, repeating
The device has
detected carbon
monoxide
See “What To Do
If Carbon Monoxide
Is Detected.”(Page 11)
Smoke SMOKE Light:
Flashing RED
Horn: 3 beeps —
silence, repeating
The device has
detected smoke
See “What To Do If
Smoke Is Detected.”
(Page 12)
Problem... The Alarm is... This means... You should...
Low Battery BATTERY Light:
Flashing yellow
Horn: Chirps every
30 seconds
The battery in the
alarm is low
Install a new 9V alkaline
or lithium battery*.
*For a list of acceptable
replacement batteries, see
“Regular Maintenance.” (Pg. 15)
Service SERVICE Light:
Flashing yellow
Horn: Chirps three
times every 30
seconds
The device is not
working properly
See “Testing and
Maintenance.” (Page 14)