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BATTERY OPERATED CARBON MONOXIDE ALARM 

WITH SILENCE FEATURE

USER’S MANUAL

Model

CO400

Printed in Mexico
M08-0140-004   

P

06/07

IMPORTANT! 

PLEASE READ CAREFULLY AND SAVE.

This user’s manual contains important information about your Carbon
Monoxide (CO) Alarm’s operation. If you are installing this CO Alarm for use
by others, you must leave this manual—or a copy of it—with the end user.

TABLE OF CONTENTS

Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

Basic Safety Information  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
How Your CO Alarm Works  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Understanding Your CO Alarm  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Installation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Where to Install CO Alarms  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Where CO Alarms Should NOT Be Installed  . . . . . . . . . . . . . . . . . . . . .2
How to Install Your CO Alarm  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

If Your CO Alarm Sounds  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

If the Alarm Signal Sounds  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Using the Silence Feature  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Testing and Maintenance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Weekly Testing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Regular Maintenance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

What You Need To Know About CO . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

What is CO? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Symptoms of CO Poisoning  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Finding the Source of CO After an Alarm  . . . . . . . . . . . . . . . . . . . . . . .4
How Can I Protect My Family?  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Potential Sources of CO in the Home  . . . . . . . . . . . . . . . . . . . . . . . . . .5

Regulatory Information for CO Alarms  . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
General Limitations Of CO Alarms  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Troubleshooting Guide  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Limited Warranty  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

© 2007 BRK Brands, Inc., a Jarden Corporation company (NYSE: JAH)
3901 Liberty Street Road, Aurora, IL 60504-8122
All rights reserved.
Consumer Affairs: (800) 323-9005
www.brkelectronics.com  •  www.firstalert.com

INTRODUCTION

BASIC SAFETY INFORMATION

Dangers, Warnings, and Cautions alert you to important operating
instructions or to potentially hazardous situations. Pay special 
attention to these items.

THIS IS NOT A SMOKE ALARM! This CO Alarm is designed to detect
carbon monoxide from ANY source of combustion. It is NOT designed
to detect smoke, fire, or any other gas.

This CO Alarm is approved for use in single-family residences. 
It is NOT designed for marine use.

This CO Alarm will only indicate the presence of carbon monoxide gas
at the sensor. Carbon monoxide gas may be present in other areas.

The Silence Feature is for your convenience only and will not correct
a CO problem. Always check your home for a potential problem after
any alarm. Failure to do so can result in injury or death.

NEVER ignore your Carbon Monoxide Alarm if it alarms. Refer to 
“If Your CO Alarm Sounds” for more information. Failure to do so
can result in injury or death.

Test the CO Alarm once a week. If the CO Alarm ever fails to test 
correctly, have it replaced immediately! If the CO Alarm is not working
properly, it cannot alert you to a problem.

This product is intended for use in ordinary indoor locations of family
living units. It is not designed to measure CO levels in compliance
with Occupational Safety and Health Administration (OSHA) commer-
cial or industrial standards. Individuals with medical conditions that
may make them more sensitive to carbon monoxide may consider
using warning devices which provide audible and visual signals for
carbon monoxide concentrations under 30 ppm. For additional 
information on carbon monoxide and your medical condition contact
your physician.

HOW YOUR CO ALARM WORKS

GENERAL INFORMATION

This CO Alarm does not operate without working batteries.
Removing the batteries, or failure to replace them at the end of their
service life, removes your protection.

A CO Alarm measures the CO levels in the air. It will alarm if CO levels rise
quickly (if the heat exchanger on your furnace breaks, for example), or if CO 
is consistently present (a slow CO leak on a fuel-burning appliance). 

This Carbon Monoxide Alarm features a permanently installed sensor and an
85 dB alarm horn. It also has a silence feature to temporarily quiet the alarm
horn.

THE PARTS OF YOUR CO ALARM

1

1

Open door here

2

Test/Silence Button

3

POWER/ALARM Light (RED)

4

Battery Compartment

5

(Behind Cover) Alarm Horn: 85dB

audible alarm for test, alarm,
and unit malfunction warning.

2

3

4

1

5

Summary of Contents for First Alert CO400

Page 1: ...esence of carbon monoxide gas at the sensor Carbon monoxide gas may be present in other areas The Silence Feature is for your convenience only and will not correct a CO problem Always check your home for a potential problem after any alarm Failure to do so can result in injury or death NEVER ignore your Carbon Monoxide Alarm if it alarms Refer to If Your CO Alarm Sounds for more information Failur...

Page 2: ...nd garages In turbulent air like near ceiling fans heat vents air conditioners fresh air returns or open windows Blowing air may prevent CO from reaching the sensors Outside the Mobile Home In direct sunlight This CO Alarm is designed for use inside a single family home or apartment It is not meant to be used in common lobbies hallways or basements of multi family buildings unless working CO Alarm...

Page 3: ...re Removing the batteries removes your protection See If Your CO Alarm Sounds for details on responding to an alarm The Silence Feature is intended to temporarily silence your CO Alarm s alarm horn while you correct the problem it will not correct a CO problem While the alarm is silenced it will continue to monitor the air for CO When CO reaches alarm levels the alarm will sound repeating horn pat...

Page 4: ... appliances Make sure appliances are vented to the outside Do not grill or barbecue indoors or in garages or on screen porches 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 shared wall Keep windows and doors open slightly If you suspect that CO is esca...

Page 5: ... air in the vent pipes cold humid air with extended periods between cycles Negative pressure differential resulting from the use of exhaust fans Several appliances running at the same time competing for limited fresh air Vent pipe connections vibrating loose from clothes dryers furnaces or water heaters Obstructions in or unconventional vent pipe designs which can amplify the above situations 2 Ex...

Page 6: ...ot be liable for any incidental or consequential damages caused by the breach of any express or implied warranty Except to the extent prohibited by applicable law any implied warranty of merchantability or fitness for a particular purpose is limited in duration to the duration of the above warranty Some states provinces or jurisdictions do not allow the exclusion or limitation of incidental or con...

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