BRK electronic CO5120B

Questions and Answers

S
Stephanie GoodwinJul 25, 2025
What to do if BRK electronic CO5120B Carbon Monoxide Alarm goes back into alarm after pressing Test/Silence?
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  Christopher HunterJul 26, 2025
  If your BRK electronic Carbon Monoxide Alarm goes back into alarm 4 minutes after you press the Test/Silence button, it means that CO levels are still potentially dangerous. Refer to Chapter 3 “If Your CO Alarm Sounds” for details on how to respond to an alarm. If anyone is feeling ill, evacuate your home immediately and call 911.
L
lindsay94Aug 1, 2025
Why does BRK electronic Carbon Monoxide Alarm sound frequently with no high CO levels?
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  Diana BurkeAug 1, 2025
  If your BRK electronic Carbon Monoxide Alarm sounds frequently even though no high levels of CO are revealed in an investigation, the alarm may be improperly located. Relocate your alarm. If frequent alarms continue, have your home rechecked for potential CO problems, as you may be experiencing an intermittent CO problem.
D
Denise WatsonAug 6, 2025
What to do if my BRK electronic Carbon Monoxide Alarm red light is off?
- C
  Calvin HudsonAug 6, 2025
  If the red light is OFF and the unit will not alarm when you press the Test/Silence button on your BRK electronic Carbon Monoxide Alarm, check the AC power supply. Make sure the power connector is securely attached to the alarm. Also, ensure a fresh 9V battery is installed to power the battery back-up.
A
Amanda JacksonAug 12, 2025
Why is my BRK electronic CO5120B chirping and the red light flashing?
- C
  collinsmatthewAug 12, 2025
  If your BRK electronic Carbon Monoxide Alarm's red light flashes and the horn “chirps” once a minute, replace the battery in the battery back-up.
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Michele MillerAug 19, 2025
What does it mean when my BRK electronic Carbon Monoxide Alarm chirps 3 times?
- M
  markbushSep 12, 2025
  If your BRK electronic Carbon Monoxide Alarm sounds 3 quick “chirps” once a minute, and the red light flashes quickly three times, it indicates a unit malfunction. Units under warranty should be returned to manufacturer for replacement. See Chapter 8 “Limited Warranty” for details.

Summary

Introduction to CO Alarms

BASIC SAFETY INFORMATION

Dangers, Warnings, and Cautions alert you to important operating instructions or potentially hazardous situations.

HOW YOUR CO ALARM WORKS

The Cover Of Your CO Alarm

Identifies the main components of the CO alarm unit, including the test/silence button and indicator light.

Malfunction Warning

Informs the user that the unit performs self-diagnostic tests and should be replaced if it malfunctions.

Basic Operation

During An Alarm

Explains the horn and light patterns when the CO alarm is activated.

Low Battery Warning

Explains the audible and visual indicators for a low battery condition.

CO ALARM SPECIFICATIONS

Required Alarm Levels

Specifies the CO concentrations and time durations that trigger an alarm.

Installation Guide

WHERE TO INSTALL CO ALARMS

Provides recommendations for the placement of CO alarms in single-level and multi-level homes.

WHERE NOT TO INSTALL CO ALARMS

USING THE OPTIONAL LOCKING FEATURES

The Battery Compartment Lock

Details the process for locking the battery compartment to prevent unauthorized access.

TO UNLOCK THE BATTERY COMPARTMENT

ELECTRICAL SHOCK HAZARD WARNING

Critical warning about electrical shock hazard when removing the unit from the mounting bracket.

The Mounting Bracket Lock

TO DEACTIVATE THE BRACKET LOCK

Provides instructions on how to deactivate the lock between the alarm and bracket.

HOW TO INSTALL YOUR CO ALARM

Before you begin installation

Pre-installation steps including finding and using self-adhesive labels for emergency contacts.

Activating the battery back-up

The Parts Of This CO Alarm

Identifies and labels the various components of the CO alarm unit.

SINGLE-STATION INSTALLATION

ELECTRICAL SHOCK HAZARD WARNING

Critical warning about turning off power before installation to prevent electrical shock.

INTERCONNECTING MULTIPLE CO ALARMS

WARNING ABOUT AC;DC ALARMS

Explains how interconnected AC and AC/DC alarms behave and potential issues.

Interconnected Unit Requirements

If Your CO Alarm Sounds

Immediate Alarm Response Steps

Provides a numbered sequence of immediate actions to take when the CO alarm activates.

Testing Interconnected Alarms

Stresses the need to test each alarm individually in an interconnected series for proper function.

Using the Silence Feature

WARNING: DO NOT Disconnect Power

Warns against disconnecting power to silence the alarm, advising the use of the feature instead.

The Latching Alarm Indicator

Interconnected Alarms Indicator

Explains how the latching alarm indicator functions for interconnected units.

Testing and Maintenance

Weekly Testing Procedure

Details the procedure for weekly testing of the CO alarm using the test button.

Regular Maintenance Tasks

Outlines routine maintenance tasks to keep the CO alarm in good working order.

What You Need To Know About CO

What is CO?

Explains what Carbon Monoxide is, how it's produced, and its common sources.

Symptoms of CO Poisoning

Lists the symptoms associated with mild, medium, and extreme CO exposure.

Potential Sources Of CO In The Home

Transient CO Problems

Discusses temporary CO issues caused by external conditions and their difficulty in investigation.

How Can I Protect My Family?

Prevent CO Problems and Reduce Risk

Provides actionable steps for preventing CO issues through appliance maintenance and usage.

Underwriters Laboratories Inc. UL2034

What Levels of CO Cause an Alarm?

Explains the UL2034 defined alarm points based on CO concentration and time.

Troubleshooting Guide

CO Alarm Condition Guide

A table correlating alarm conditions with their meaning and recommended actions.

LIGHT AND HORN PATTERNS (AC POWER ON)

LIGHT AND HORN PATTERNS (AC POWER OFF)

WARNING: Battery Failure During AC Outage

Crucial warning about alarm failure if battery is dead or missing during AC power outage.

General Limitations Of CO Alarms

CO Alarms Are Not Foolproof

Points out that all electronic devices have limitations, including CO alarms.

Limited Warranty