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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.

The light flashes (RED) and the horn sounds 3 quick
“chirps” every minute.

MALFUNCTION SIGNAL.

CO Alarm needs to be

replaced.

CO Alarms under warranty should be returned to 
manufacturer for replacement. See “Limited
Warranty” for details.

PROBLEM...

THIS MEANS...

YOU SHOULD...

The light continues to flash (RED) and the horn
“chirps” once every minute.

Low battery warning.

Install 2 new AA batteries

*

.

LIMITED WARRANTY

BRK Brands, Inc. ("BRK") the maker of BRK

®

brand and First Alert

®

brand products, warrants that for a period of five years from the date of purchase, this product

will be free from defects in material and workmanship. BRK, at its option, will repair or replace this product or any component of the product found to be defective
during the warranty period. Replacement will be made with a new or remanufactured product or component. If the product is no longer available, replacement may
be made with a similar product of equal or greater value. This is your exclusive warranty.

This warranty is valid for the original retail purchaser from the date of initial retail purchase and is not transferable. Keep the original sales receipt. Proof of purchase
is required to obtain warranty performance. BRK dealers, service centers, or retail stores selling BRK products do not have the right to alter, modify or any way
change the terms and conditions of this warranty.

This warranty does not cover normal wear of parts or damage resulting from any of the following: negligent use or misuse of the product, use on improper 
voltage or current, use contrary to the operating instructions, disassembly, repair or alteration by anyone other than BRK or an authorized service center. 
Further, the warranty does not cover acts of God, such as fire, flood, hurricanes and tornadoes or any batteries that are included with this unit.

BRK shall not 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 consequential damages or limitations on how long an implied warranty lasts, so 
the above limitations or exclusion may not apply to you. This warranty gives you specific legal rights, and you may also have other rights that vary from state to
state, or province to province.

How to Obtain Warranty Service:

Service: 

If service is required, do not return the product to your retailer. In order to obtain warranty service, contact the Consumer Affairs Division at 

1-800-323-9005, 7:30 AM to 5:00 PM, Central Standard Time, Monday through Friday. To assist in serving you, please have the model number and date 
of purchase available when calling.  

For Warranty Service return to: 

25 Spur Drive, El Paso, TX 79906

Battery:

BRK Brands, Inc. makes no warranty, express or implied, written or oral, including that of merchantability or fitness for any particular purpose, with 

respect to battery.

6

TROUBLESHOOTING GUIDE

CO Alarm sounds frequently even though no high 
levels of CO are revealed in an investigation.

The CO Alarm may be improperly located. Refer to
“Where to Install CO Alarms.”

Relocate your alarm. If frequent alarms continue, 
have home rechecked for potential CO problems. 
You may be experiencing an intermittent CO problem.

If you have any questions that cannot be answered by reading this manual, call Consumer Affairs at 1-800-323-9005.

*For a list of acceptable replacement batteries, see “Page 4: Regular Maintenance.”

First Alert

®

is a registered trademark of the First Alert Trust.

Printed in Mexico   M08-0140-004   

P

06/07

For your records, please record:

Date Purchased: _______________Where Purchased: ___________________

Date Installed: ____________/____________Month/Year

Replacement date is five years after installation:

_____________/____________Month/Year

NOTE: End of Life Signal — Once the unit reaches the end of its 
lifecycle, the MALFUNCTION SIGNAL will sound once a minute to 
indicate the need to immediately replace the Alarm.

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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