3 Beeps On a Carbon Monoxide Detector- Should I Be Worried?

A continuous or constant beep is a common sound from a carbon monoxide detector. It is the typical warning chirp and notifies you of potential danger.

Further, almost all carbon monoxide detectors produce this beep type when functioning correctly.

The first detector alert warns you to leave the room or area and go outside for fresh air. However, sometimes, the device produces three beeps.

So, let us discuss the question: 3 Beeps On a Carbon Monoxide Detector, what does it mean?

Three beeps on a carbon monoxide detector signify a malfunction with the alarm. Also, these chirps occur after every fifteen minutes, making them hard to ignore.

Therefore, contact the product manufacturer and get it checked immediately. In addition, remember that having a functional carbon monoxide alarm is advisable for enhanced safety.

The carbon monoxide detector also produces sounds like a pulsing or intermittent beep. This signal indicates dangerously high carbon monoxide levels, and it is prudent to take action.

Check out this write-up for more insight into the devices, how they relate to carbon monoxide levels, and interpret different beep types.

What Is a Carbon Monoxide Detector?

3 Beeps On a Carbon Monoxide Detector
A Carbon Monoxide Detector

A carbon monoxide (CO) detector detects CO gas to prevent poisoning. Further, it is a simple device with a few components, such as a silicon microchip and a sensor.

A plastic shell houses the silicon microchip, which sends an electrical charge to the carbon monoxide sensor. This sensor detects high CO levels, triggering the microchip’s alarm.

Carbon Monoxide detectors also have a test button, a power indicator light, and an LCD screen.

Moreover, device models with the LCD screen display the system status and CO gas levels during an alarm.

Furthermore, the device has power indicator lights, an LCD screen, and a test button that facilitates convenient handling.

The indicator also shows whether the unit is functional or requires a battery replacement.

Some CO detector brands make a chirping noise to indicate low battery levels. The test button also comes in handy during functionality tests.

So, test the device monthly and change or replace the batteries when necessary.

Generally, carbon monoxide detector units sound an alarm after sensing certain CO levels over time. In addition, you will observe different sensors in various alert types. They include

  • Biometric Sensor. This sensor features a gel that changes color after carbon monoxide absorption. Then, this hue triggers the alarm.
  • Electrochemical Sensor. The electrodes in a chemical formula sense electrical current change. This scenario lowers the electrical resistance, triggering the alarm.
  • Metal Oxide Semiconductor. The silica chip’s circuitry lowers electrical resistance after detecting CO, triggering the alarm.

Remember, once the carbon monoxide alarm device sounds, you need a CO-free space to silence the siren.

There are three primary carbon monoxide detector models on the market. Getting the most suitable device for your facility is prudent for maximum safety and protection. The types are as follows.

  • Battery-Operated Carbon Monoxide Detectors

These CO detectors are the most flexible and easiest to handle. Besides, they utilize a sensor technology that quickly detects carbon monoxide exposure.

You can install the detector anywhere and move it around since it does not depend on a fixed power source.

However, you must replace the batteries annually to guarantee enough operational energy.

  • Smoke/Carbon Monoxide Dual Detectors

Interestingly, some devices are all-in-one, thus detecting smoke and carbon monoxide. They are ideal for space-challenged facilities or households where you want to minimize visual clutter.

In addition, most smart carbon monoxide detectors are a smoke-CO combination and successfully identify either occurrence.

  • Hardwired or Plug-In Carbon Monoxide Detectors

You can wire CO detectors to the existing household current, plug them into an outlet, and expect optimal functionality.

Moreover, the devices are low maintenance as they do not use batteries. Even better, the sensor cycles itself, quickly purging and resampling for carbon monoxide.

Dangers of Carbon Monoxide Detectors Beeping

Learning why a carbon monoxide detector beeps is critical in determining the course of action. Although there are various reasons for the chirps, please pay attention to them and investigate the matter.

Evacuate the facility or premises and call the fire brigade and boiler technician if the CO detector beeps for the first time.

Conversely, sometimes, the unit’s alarm beeps constantly without a CO risk. Here, check why it is chirping and take the necessary action.

Most times, the issue is a simple malfunction or flat batteries. But a thorough check is advisable to guarantee it is not something more serious.

Ignoring a CO detector’s beeps may jeopardize your household, especially if the alert shows high carbon monoxide levels.

In addition, fix a faulty carbon monoxide detector as soon as possible. Otherwise, you may not detect a CO gas hazard early enough.

How to Use Carbon Monoxide Detectors Safely

Following the manufacturer’s instructions is the surest way to use a carbon monoxide detector safely and effectively. Here are a few expected guidelines.

  • Keep the unit at least six feet from a fuel or flame source. Otherwise, you will get multiple false alarms.
  • Install the device at least five feet from the ground or on the ceiling, keeping it six inches from the wall.
  • Drill holes and hang the mounting bracket to ensure a firm grip.
  • Use new batteries for optimal efficacy.
  • Test the detector by pressing and holding the test button. You should see lights and hear an alarm.
  • Attach the carbon monoxide detector to the installed bracket.

Smoke and CO detectors need regular maintenance to remain operational. Also, always check the battery level by pressing the text button. This way, you can replace the batteries on time.

In addition, replace the unit’s batteries at least annually. Otherwise, they may run out, compromising the detector’s functionality.

Carbon monoxide detectors also need replacement after their life span expires. Unlike smoke detectors that give a battery-low warning sign, CO detector units start chirping when it’s time to replace them.

Fortunately, the alarms also have a long lifespan, up to five years. Therefore, you’ll enjoy their services before thinking of a reinstallation.

Further, these detectors differ from standard smoke alarms, so most people must learn how and where to place them.

Thankfully, the Consumer Product Safety Commission gives some guidelines. For example, it recommends placing the unit on each home level and outside sleeping areas.

In addition, there should be a minimum number of detectors. For example, one should be in the hall, allowing all bedrooms to hear the warning.

Carbon monoxide poisoning is mild and won’t wake you up. Thus, ensure each room can hear the alert.

Also, remember that the carbon monoxide detector works best at roughly five feet from the ground. Here, it measures the air at a suitable height, especially the level that people are breathing it.

Revealing carbon monoxide sources is essential to ensuring the leak does not happen again. These include fuel-burning devices and flame sources such as gas dryers, vehicles, water heaters, furnaces, and fireplaces.

Sometimes, you’ll need the alarm in the kitchen. But please avoid mounting it over or near a flame-producing device such as a grill, stove, or fireplace. This way, you won’t have false alarms.

Finally, the International Association of Fire Chiefs advises homeowners to install a carbon monoxide detector in their basements. Laundry machines, furnaces, and water heaters are potential CO sources.

You can also consider the garage as vehicles are a common carbon monoxide producer.

How to Identify the Smell of Carbon Monoxide

CO is colorless with no smell, making it difficult to detect. Therefore, you’ll have to rely on carbon monoxide detectors.

In addition, exposure to high CO levels has various symptoms, such as dizziness and headaches.

Carbon monoxide originates from an incomplete process of liquid, solid, and gaseous fuels or appliances fueled with oil, natural gas, kerosene, wood, coal, and liquefied petroleum.

You can also produce the gas by running a non-electric machine or burning charcoal.

Typically, small amounts of carbon monoxide from home heating equipment do not build up inside as they are vented outside. But sometimes, the air circulating the heating systems and rooms is not adequately vented, or there’s a leakage causing CO buildup.

As a result, you experience carbon monoxide poisoning, leading to a blockage of normal oxygen delivery to the tissues.

Further, CO is hazardous and often called a ‘silent killer, as it is hard to detect until it is too late.

In addition, although many carbon monoxide poisoning victims recover with treatment, severe cases lead to permanent brain damage.

Thankfully, we have a few signs that show a carbon monoxide leak in your home or house.

  • Heavy condensation and dripping on the windows near the appliance show you’ve reduced moisture production. But it could also signify that the humidifier settings are very high.
  • Brownish-yellow or sooty stains around the leaking device.
  • Stuffy or stale smell, especially the odor of something overheating or burning.
  • Lacking an upward draft in the chimney flue.
  • Fumes, smoke, soot, or back-draft in a home from a fireplace, chimney, or fuel-burning equipment.
  • Some fallen soot in the fireplace.
  • The odor of unusual gases in the facility. Although CO is odorless, you may notice exhaust gases.
  • Solid fuel fires combust slower than usual.
  • A yellow burner flame instead of a transparent blue flame.
  • A frequently blowing out the pilot light.

You must act immediately after detecting a carbon monoxide leakage. Check out the above signs and symptoms of CO poisoning, such as tightness around the forehead, headaches, and increased heart pounding.

Generally, the first protective measure against carbon monoxide poisoning involves inspecting the home’s heating devices annually.

These devices include chimneys, vents, and gas appliances.

Lastly, install carbon monoxide alarms on every home level and test them regularly. Also, avoid using BBQs, charcoal fuel burners, or grills in unventilated spaces.

Common Causes of Carbon Monoxide Detectors Beeping

Carbon monoxide detectors beep for various reasons, including flat batteries, faulty units, and high CO levels.

Read this section for detailed information.

  • Cause One: Flat Batteries

This is among the leading causes of CO detector beeps. Also, low or flat batteries hinder the device’s functionality, so it gives a faint chirp to warn you.

Here, test the device to confirm that the batteries are flat. Press and hold the small test button and observe whether the alarm sounds.

Change the batteries if they are below par and check whether the chirps stop.

  • Cause Two: The Unit is Faulty

CO detectors from reputable brands are of good quality and have a five-year guarantee. Besides, these devices last for at least seven years before needing replacement.

However, only qualified technicians should replace the unit when it becomes faulty. Therefore, consult a professional when the detector beeps continuously for no reason.

  • Cause Three: High Carbon Monoxide Levels

Dangerously high CO levels trigger the detector’s alarm. Hence, do not assume the carbon monoxide leak is in your facility. Sometimes, it may be from the neighboring building.

In addition, move away from the facility if you notice carbon monoxide in the atmosphere. Then, call an emergency service to investigate the situation.

Remember, symptoms associated with CO poisoning include stomach pain, nausea, dizziness, and difficulty breathing.

Can Carbon Monoxide Be a False Alarm?

A carbon monoxide detector can give a false alarm due to its proximity to fuel-burning appliances, a low-quality device, and humidity exposure.

But still, it’s good to have the device, only minimize the triggers.

  • Trigger One: Fuel-Burning Appliances

Generally, a carbon monoxide detector alerts you of unsafe CO levels. Also, the gas is odorless and undetectable in mild degrees, making it easy to experience CO poisoning.

So, get the unit for enhanced safety and guaranteed peace of mind.

Further, even in excellent conditions, fuel-burning appliances, such as water heaters, portable gas heaters, and wood-burning stoves, produce mild CO levels. Thus, placing a carbon monoxide detector too close to them triggers a false alarm.

As a result, experts recommend placing the device 15 to 20 feet away from these appliances to minimize false readings.

  • Trigger Two: Humidity Sources

Exposure to high humidity and moisture sources affects the CO detector’s functionality. Also, although atmospheric moisture does not trigger the alarm, it may damage some device parts, causing a malfunction.

Please avoid placing these units in steam rooms, bathrooms, or near humidifiers. Instead, keep them at least ten feet away from humidity sources.

  • Trigger Three: Hydrogen Gas

Depending on the carbon monoxide detector’s design, it may be prone to interference from other gases, such as hydrogen. The gas also messes with chemical reactions, allowing the unit to do its job.

Further, lead acid batteries produce hydrogen that causes interference with the device, leading to a false alarm.

  • Trigger Four: Internal Malfunction

Working with a carbon monoxide detector is unpredictable when its batteries are flat or the unit needs replacement.

Moreover, a damaged part causes it to operate irregularly and trigger the alarm without CO presence. Thus, purchasing a new device is advisable, as fixing it is challenging. 

Fortunately, the CO detectors feature a different alarm pattern to show dysfunctional parts.

So, you have nothing to worry about.

Despite a signal being a false alarm, it is advisable never to ignore it. Besides, unsafe carbon monoxide levels come from appliances needing repair, replacement, or inspection.

Thus, follow the emergency guidelines and evacuate immediately.

In addition, wait for an expert to conduct a thorough safety inspection before reentering the facility.

You can refer to the manufacturer’s manual when in doubt. It gives you specific signals from your CO detector and how to interpret them. But generally, if the unit beeps continually, the alert is false, or something needs replacement.

Below are some alert sirens and what they mean.

  • Five Beeps Per Minute

This signal shows that the CO detector is old and needs replacement. Every product has a lifespan, even advanced technological products.

Thankfully, carbon monoxide detectors do not die immediately. Instead, they give the user a warning before they stop working.

Therefore, invest in a good quality product to protect your facility and install it before the other dies.

  • Four Beeps and a Pause 

These alerts signify that the facility has high carbon monoxide levels. Therefore, move away from the room and call for emergency assistance.

  • Three Beeps Every 15 Minutes

Three chirps after 15 minutes reveal that the carbon monoxide detector is incorrectly mounted or faulty. Therefore, inspect the CO device for faults and replace it with a compatible unit.

  • One Beep Per Minute

This beep shows that the device’s battery is running low. Hence, the CO detector alerts you that the batteries need replacing.

However, although this occurrence is not an emergency, replace these batteries as soon as possible.

How to Reduce Carbon Monoxide and Smoke Detector False Alarms

Smoke and carbon monoxide detectors can give false alarms for various reasons. Further, nuisance or false alarms occur when the device goes off without detecting CO in the facility.

However, evacuate the building and call 911 if the CO detector sounds, even when unsure of its validity.

Still, false alarms are frustrating, especially when cooking or in the middle of the night. Therefore, consider the installation and maintenance tips below to reduce these nuisance sirens.

  • Test the monthly smoke alarms and carbon monoxide detectors to confirm they operate efficiently.
  • Change the unit’s batteries semi-annually for battery-powered devices.
  • Clean the device at least once a month for better functionality.
  • Gently vacuum the alarm’s exterior using a household vacuum brush attachment. You can also use a can with clean compressed air. But please avoid using cleaners, water, and solvents as they damage the device.
  • Replace the CO detector immediately when contaminated by excessive dust, dirt, and grime.
  • Relocate the unit if it gives frequent unwanted alarms; perhaps it’s in an area susceptible to false triggers. These areas include furnace rooms, unfinished attics, and dirty, greasy, or dusty garages.
  • Keep the device at least ten feet from cooking appliances or air streams near kitchens. Air currents draw the cooking smoke to the smoke sensor, causing unwanted alarms.
  • Place the detectors ten feet from extremely humid regions, such as the sauna, dishwasher, utility room, shower, vaporizer, laundry room, or shower.
  • Install smoke and fire alarms 20 feet from combustion particle sources like water heaters, stoves, space heaters, kitchens, and poorly ventilated garages or furnace rooms.

Here’s How to Prevent False Alarm:

Frequently Asked Questions

The questions include:

  • What Is Carbon Monoxide?

CO gas is one part carbon and one part oxygen. It comes from incomplete combustion caused by carbon fuel sources such as gasoline, coal, natural gas, wood, and heating oil.

These energy sources are not hazardous when burned in an open space with excellent ventilation. The problem occurs in confined areas like garages, campers, kitchens, and basements.

Further, mild carbon monoxide levels are undetectable yet can lead to CO poisoning. Therefore, it is prudent to get a sensor for guaranteed safety.

  • Why Is Carbon Monoxide Dangerous?

CO is dangerous as it mixes with your red blood cells, starving your body of oxygen. Early symptoms of carbon monoxide poisoning include:

  • Vomiting
  • Nausea
  • Headache
  • Shortness of breath
  • Fatigue
  • Dizziness

Unfortunately, these symptoms are similar to cold and flu infections, making them easy to ignore. Therefore, having a carbon monoxide detector unit in your home is prudent to rule out CO presence possibilities.

In addition, the device is among the fastest methods to prevent carbon monoxide poisoning. It also works like fire and smoke alarms, making them easy to install and handle.

  • Which Carbon Monoxide Detector Should I Get?

Carbon monoxide detectors quickly sense CO and alert you as soon as possible. However, we have various brands in the market, requiring you to choose the most suitable one for your facility.

Some simple brands use a battery or plug into sockets. Also, they alert you with a clear siren, like the one on smoke detectors.

Moreover, these detectors are affordable and ideal for multi-room buildings requiring several units.

Most carbon monoxide detector sensors are ideal for detecting smoke and carbon monoxide. Thus, they are an excellent option as you use fewer sensors on your ceilings and walls.

Finally, smart devices connect with the smart home system and alert you through mobile applications. Although these models are pricey, they are a prudent investment for enhanced safety.

  • What Do I Do When My Carbon Monoxide Detector Goes Off?

First, gather everyone in the facility and move outside for fresh air. Walk calmly and do not panic.

Also, open as many doors and windows as possible to enhance air circulation. But it’s not mandatory to open every door or window. So, only focus on the ones along the way to reduce CO exposure.

Carbon monoxide detectors make different sounds. Hence, it is important to know the difference between the device’s end-of-life signal and an actual alarm.

Survey everyone’s condition and health, checking for flu-like symptoms suggesting CO poisoning. Then, call 911 immediately for urgent help.

Please avoid reentering the facility until the siren stops sounding or the emergency responder confirms it’s safe.

In addition, contact an expert to evaluate fossil fuel-burning appliances, especially stoves and heaters or any CO sources. This will prevent future problems.

  • How Many Carbon Monoxide Detectors Do I Need?

We do not have a specific law prescribing the number of CO detectors in a home or facility. It boils down to your personal preferences and budget.

For instance, you may stick with one detector on each home level or have one in every room and corridor.

Also, having a detector on every floor and elevator is advisable when working with a facility with multiple floors.

However, check out your area’s building and safety codes for more guidelines.

  • What Type of Sounds Should I Expect From my CO Detector?
  • This is a loud, Steady Alarm. Please do not confuse this signal with chirps or beeps, as it warns you of an emergency.

The unit produces this sound after detecting carbon monoxide in the facility.

Therefore, get the occupants to fresh air and call 911.

  • One Beep at 15-Minute Interval. This beep indicates that the detector’s battery is flat. Thus, replace it to keep the unit functional.
  • Three Beeps at 15-Minute Intervals. This chirp shows a malfunction, requiring contacting the product retailer or manufacturer.
  • Five Beeps at 15-Minute Intervals. This sound indicates that the unit has reached its end of life. Thus, it is prudent to install a new one.

Refer to the product manual for more information on the model to confirm the expected sound patterns.

  • Where Can I Position a Carbon Monoxide Detector?

Place the CO-detecting device in an area where everyone in the facility can hear it. For example, position it at least on each level, including the basement and garage.

Also, have one device near sleeping spaces and doors leading to attached garages.

Finally, follow the manufacturer’s directives for more guidance and tips beyond the above locations.

  • What Causes Consistently Chirping Smoke Alarms and CO Detectors?

Smoke alarms and carbon monoxide detectors may consistently chirp for various reasons. They include

  • Alarm Malfunction. The device beeps between the Red LED flashes. So, press and hold the test button for about two seconds and wait for the alarm to sound. If it does not sound, the unit has a system malfunction or a defective battery.
  • Low Battery. The alarm beeps for seven days every 30 to 40 seconds, but others chirp every 60 seconds. So, replace the battery and test the device.
  • Interference. This aspect occurs for wireless alarms when they receive interference from similar nearby systems. You’ll arrive at this conclusion if the smoke detector enters Full Alarm Mode without detecting smoke.

In addition, check for interference when you have not activated the unit’s test buttons, yet it sounds the alarm. You can also refer to the manufacturer’s directive on how to choose a different DIP switch pattern.

  • Hush Condition. Alarms with the Hush Feature beep every 30 to 40 seconds for seven minutes after activation.
  • End of Life Condition. Alarms with a sealed battery model chirp every 30 seconds to remind you to replace the unit.


  • What’s the Emergency Procedure If I Detect CO?

The first step is to switch off the fuel-burning appliance safely and quickly. Then, evacuate the room, leaving doors and windows.

Also, call 911 once everyone goes outside and encourage the first responders to treat victims. They can even identify the source of the gas.

Finally, contact your utility provider for follow-up. Only return to the facility when everything is clear.

  • How Do I Teach My Family to Respond Quickly in a CO Emergency?

First, learn how to install and handle a carbon monoxide detector. In addition, read the user manual for more insight into the device.

Educate children and all family members on the various beeping and chirping patterns to expect during an emergency. You can even create an escape plan and practice it frequently.

Finally, identify family individuals with disabilities and make special advance arrangements to rescue them during CO emergencies.

  • What CO Detector Features Should I Consider?

Most households have detectors for insurance and safety. Besides, smoke and carbon monoxide detector technology has advanced, guaranteeing enhanced safety measures.

In addition, it is prudent to have the most suitable device. For instance, the ionization smoke detector detects quick-flaming fires. 

However, these devices are not good at detecting slow and smoldering fires. They mistake steam and burnt food for a fire hazard, leading to false alarms.

On the other hand, photoelectric smoke detectors are perfect for detecting slow, smoldering fires. However, they respond slowly to quick flaming fires.

You can invest in dual-sensor smoke detectors, which sense quick and slow fires. In addition, the devices come with the following features.

  • Digital Carbon Monoxide Display. This feature adds an enhanced security layer, enabling you to evaluate the carbon monoxide level in a facility closely.

Further, the CO detector’s alarm goes off when the facility’s carbon monoxide level is 70 parts per million (PPM).

But remember, 30 PPM can harm children, pregnant women, and individuals with a heart condition.

  • Interconnecting Detectors. Some devices interconnect without wires, making them a sophisticated option.

In addition, when one detector goes off, the others also go off, ensuring the alarm is audible.

  • Hush Button. Sometimes, carbon monoxide detectors constantly chirp, making getting a device with a hush button feature prudent.

This button silences beeping sounds without turning off the detector.

  • How Do I Ensure My Smoke and Carbon Monoxide Detectors Work?

Unlike multiple primary appliances, smoke and carbon monoxide detectors have shorter life spans. 

Further, smoke detectors last up to ten years, whereas CO ones last up to five. But like other units, they are unpredictable and can break down early.

Fortunately, a well-functioning device only needs new batteries and a cleaning and care routine to last longer. So, check out the simple tips below.

  • Please do not wait for an annoying beep. Hence, replace the batteries annually and keep track of the replacement duration. Also, pick a day to inspect the detectors annually, as it is better to be safe than sorry.
  • Test the detectors routinely to confirm they are operational. For instance, check them weekly, as carbon monoxide is colorless, odorless, and harmful upon inhalation.
  • Ensure the carbon monoxide detector is in the correct location. For example, have the devices in enclosed areas, separate floors, and bedrooms. In addition, keep them ten feet from cooking appliances to minimize false alarms.
  • Keep the carbon monoxide detector away from doors, ducts, and windows as they decrease its efficacy. Moreover, these devices are touchier than smoke detectors, requiring you to keep them away from heat sources, humidity, dust, and extreme temperature conditions.
  • Clean the detector frequently using a vacuum hose or air compressor to prevent false alarms. Remember, a clean device only goes off when it’s supposed to, sparing you the stress of guessing what beep sounds mean.
  • Examine false alarms to correct issues such as an inappropriate location. The assessment will show whether the batteries are functional or need replacement.


Installing a carbon monoxide alarm in commercial and residential buildings is essential. It warns the occupants of this colorless, tasteless, odorless, and potentially fatal gas.

Further, homeowners should be proactive about having functional devices, as carbon monoxide leads to severe illnesses and death.

However, most users do not know the different sounds on the detector. In addition, a carbon monoxide alarm beep is alarming and confusing.

Thankfully, the discussion above gives you all the information you need on the devices. So…

3 Beeps On a Carbon Monoxide Detector

Three beeps from a carbon monoxide detector show the device is faulty or incorrectly installed. As such, replace the unit immediately and get a compatible detector.

Remember, a carbon monoxide alarm sound shows that something is wrong. The more beeps, the more serious the situation.

So, always inspect sources of carbon monoxide when the detector keeps beeping. Otherwise, just because the device stops sounding does not mean the home is clear of dangerous gas levels.

Leave a Comment

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.