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• Check for exhaust backflow from CO sources. Check the draft hood on an operating furnace
for a backdraft. Look for cracks on furnace heat exchangers.
• Check the house or garage on the other side of a shared wall.
• Keep windows and doors open slightly. If you suspect that CO is escaping into your home, open
a window or a door. Opening windows and doors can significantly decrease CO levels.
Silent - then
One long beep
Alarm Test
Blinks On in sync
with the cycle
of 4 beeps and
turns Off
Nuisance
Alarm
Horn sounds
when no hazard
is present
Blinks On
in sync with the
cycle of 4 beeps
Nuisance Alarm.
If there is no hazard present, verify the alarm is mounted
in the correct location (see User’s Manual, “AVOID THESE
LOCATIONS” section). Reset alarm as instructed below.
Silence Feature
The alarm has previously detected CO and had alarmed.
Follow the reset instructions below to remove the peak CO
level memory reading.
Off
HORN
ALARM AUDIBLE & VISUAL SIGNALS
New - Out
of Package
CONDITION
QUICK REFERENCE GUIDE / OPERATIONAL SUMMARY
3 chirps
approx every
60 seconds
Sensor
Trouble/Service
Alarm
Sensor Trouble/Service Alarm.
Reset the alarm as instructed below. If this does not clear the
problem, deactivate the alarm. See ALARM DEACTIVATION
section in the user’s manual. Replace alarm immediately. Alarm
will no longer detect CO.
Blinks on
approx every
2 seconds
Product
End-of-Service
Life Notification
2 chirps
approx every
60 seconds
Product End-of-Service Life Alarm.
Deactivate and replace the alarm immediately. See ALARM
DEACTIVATION section in user’s manual.
Alarm will no
longer detect CO.
Off
RECOMMENDATION
DC Power is
Present
Silent
Off and Blinks On
approx every 2
minutes
CO alarm
If a hazard is identified, please take all precautions when an
alarm sounds by calling an Emergency Service and getting
out of the home.
4 beeps,
5 second pause,
repeats
Originating
CO Alarm
Silent
To activate the alarm, remove the pull tab. The alarm will sound
one long beep to let you know it is powered. Press the Test/
Silence/Reset/Peak button. Test the alarm following installation
and weekly thereafter. The built-in test switch accurately tests
the alarm operation as required by ANSI/UL 2034 Standard for
Safety. If, at any time, you test the alarm and it does not perform
as described, replace it immediately.
The Test/Silence/Reset/Peak button has been pressed and
released. The test sequence lasts for approx 3 seconds after
the button is released.
None. The alarm is operating properly.
RED LED
4 beeps,
5 second pause,
4 beeps
DC power is present.
If a hazard is identified, please take all precautions when an
alarm sounds by calling an Emergency Service and getting
out of the home.
Off and blinks On
approx every
10 seconds for
approx 5 minutes
Blinks On
in sync with the
cycle of 4 beeps
Reset Alarm
- Press and Hold the Test/Silence/Peak/Reset button for approximately 10 seconds and release.
This will clear the CO Silence and Sensor Trouble/Service Alarm and Peak CO memory (on alarm models with the display screen).
