Carbon monoxide detector going off every 30 seconds

Consistently chirping smoke alarms

The following conditions could cause your smoke alarm to chirp consistently:

  • Low Battery – The alarm will chirp every 30-40 seconds (every 60 seconds for some alarms) for a minimum of seven days. Replace the battery when this occurs, then test your alarm.

  • Alarm Malfunction – The alarm will chirp between flashes of the Red LED. If this occurs, press and hold the Test button for a minimum of two seconds. If the alarm does not sound, your unit has a defective battery or other failure.

  • Hush Condition – If your alarm has the Hush feature, the alarm will chirp every 30-40 seconds for approximately seven minutes while the Hush feature is activated.

  • End of Life Condition (Sealed Battery Models Only) – The alarm will chirp every 30 seconds to indicate it is time to replace the alarm.

  • Interference (For Wireless Alarms Only) – If your smoke alarm enters into Full Alarm and there is no presence of smoke, and the test buttons have not been activated on any units, it is likely you are receiving interference from a similar nearby system. To correct this, refer to your user's manual on how to select a different DIP switch pattern.

Consistently chirping carbon monoxide alarms

The following conditions could cause your carbon monoxide alarm to chirp consistently:

  • Low Battery Condition – The alarm will chirp once every 60 seconds to indicate the batteries need to be replaced.

  • End of Life Warning – Seven years after initial power up, a Kidde CO alarm will begin chirping every 30 seconds. The chirp will not stop until the unit is powered off.

    • WARNING: The alarm will not respond to carbon monoxide in this condition.

  • Malfunction Condition – The alarm chirping every 30 seconds and could indicate a unit malfunction. Call our Product Support when this occurs at 1-800-880-6788.

  • Error Condition – The alarm will chirp every 30 seconds, indicating a very low battery or unit malfunction.

NOTE: For more information about your specific alarm, refer to your user's manual.

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Several things may be causing your alarm(s) to sound or chirp. It's important to understand the different audible signals from your alarm.

Continuous Four-Beep Alarm Pattern

When the carbon monoxide (CO) alarm senses a dangerous level of carbon monoxide, the unit will emit a loud alarm pattern. The alarm pattern is four short beeps – followed by five seconds of silence – followed by four short beeps.*

  • Your alarm may have detected carbon monoxide. Make sure that you know how to respond to a CO emergency.

  • You may be experiencing a nuisance alarm. Follow the procedure for nuisance alarms.

*NOTE: When the unit is disconnected from the 120V power supply and on battery backup, the alarm pattern will continue for the first five minutes after detecting carbon monoxide and then the cycle will repeat every minute.

Consistent Chirping

Several things could cause an alarm to chirp according to a regular consistent pattern. For more information, go to what causes consistent chirping?

If you only hear one chirp every 30 seconds, this may indicate that your alarm has one of the following conditions:

  • End-of-Life warning

  • Low battery warning (see your user's manual for more details)

  • Alarm malfunction

Random Intermittent Chirping

Several things could cause an alarm to sound briefly or chirp randomly without a regular pattern. For more information, go to what causes intermittent beeping or chirping?

One Long, Continuous Squeal

If you hear a long, continuous squeal, this may indicate that your alarm has one of the following conditions:

  • Tamper-resist warning: this can be activated, causing the unit to go into alarm if it has been unplugged or has come loose from the outlet. (See your user's manual for more details.)

  • Alarm malfunction

NOTE: For more information about your specific alarm, refer to your user’s manual.

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It's scary to think that an odorless, colorless, tasteless, invisible gas can kill you in your own home or office building. By learning about carbon monoxide poisoning and what to do when there might be an unhealthy dose of CO in your building, you can mitigate the risks associated with this silent killer. 

Carbon monoxide poisoning kills about 170 people in the United States every year. CO poisoning is more common in the winter months when windows are closed and heaters, fireplaces, and furnaces are in use. These deaths are 100% preventable. It starts by having carbon monoxide detectors installed in residential and commercial buildings. The second part of the equation is making people aware of what to do when the carbon monoxide alarm is going off.

Carbon monoxide detector going off every 30 seconds

So you've taken the legal and safety precautions and installed smoke and CO detectors. But what do you do when your detector starts beeping? Below are the steps you should follow immediately:

1. Get out of the building if you or anyone else are experiencing symptoms 

This is the most important step. Take a look at the list of common symptoms to learn what to look out for. 

Symptoms of Carbon Monoxide Poisoning

  • Fatigue and drowsiness
  • Headaches
  • Impaired judgement
  • Shortness of breath
  • Confusion
  • Low blood pressure
  • Rapid heartbeat
  • Chest Pain
  • Nausea and vomiting
  • High levels of poisoning can lead to loss of consciousness and muscular coordination, and ultimately, death. 

Note that pets typically become poisoned by carbon monoxide in the building before people do. They may become very weak or unresponsive, so be aware of this when checking for symptoms or exiting the building.

When your carbon monoxide detector is beeping, acting quickly is key. The more of the deadly gas you breathe in, the more likely you are to face serious health consequences. This is because the poisonous gas replaces the oxygen in your blood, which can result in long-term brain damage, organ damage, heart damage, and death. 

It's not uncommon for people to think they have symptoms of the flu, when in fact their life is in danger. At the end of the day, it's always better to be safe by seeking fresh air if your detector is going off. Remember that breathing in CO gas can affect people differently, and once you are unconscious, there is little chance of getting out unharmed.

2. Check Your CO Detector 

Many people have smoke alarms that also function as carbon monoxide detectors. Make sure you know what kind you have. The significance of different beeping might mean different things for different types of detectors. If your detector is low on battery, you will likely hear a short chirp every minute. 

To warn of dangerous CO levels, most detectors will beep 4 or 5 times in a row about every 4 seconds. Do not mistake dangerous levels of poisonous gas for a detector with low battery! Even if no one in the building is experiencing symptoms yet, if there's a chance your detector is signaling carbon monoxide, get everyone outside to fresh air.  

3. Call Emergency Services

As soon as you are outside the building, call the closest emergency service (911) or your local fire department. Check that your family members and any visitors have made it out of the building as well. If you notice someone might be missing, do not re-enter the building. You can let emergency services know who you think may still be inside. 

It's always a good idea to have an escape plan in place for carbon monoxide or fire emergencies. This will help everyone in the building be aware of what to do and where to meet when there is an emergency. 

4. Get a Carbon Monoxide Inspection

After a carbon monoxide emergency in your building, it's imperative that you have a professional pinpoint, repair, and if necessary, replace, the source of the CO leak. Carbon monoxide can leak from different ventilation, cooking, or heating appliances and sources such as:

Carbon monoxide detector going off every 30 seconds

  • chimneys and furnace systems
  • fireplaces
  • wood burning stoves
  • cigarette smoke
  • generators
  • central heating systems
  • boilers
  • gas ranges

When there is a carbon monoxide leak, it is typically because the appliance is damaged, installed improperly, or is being used incorrectly. CO poisoning is more common in the winter because people keep their windows closed in the colder months, and are more likely to use heating appliances. For instance, if a chimney becomes blocked, the fumes enter the home instead of getting released outside. It's the same dangerous effect that an idling car in a closed garage has. 

5. Frequently Test Your Carbon Monoxide Detectors 

Even if you had a false alarm, it's important to test your detectors regularly. For detectors that are plugged into an outlet, you should test them once a month. If your carbon monoxide detectors are battery operated, change the batteries at least once a year.

By rule of thumb, carbon monoxide detectors typically last 5-7 years before they should be replaced. Manufacturers highly recommend 5 years.

Carbon monoxide poisoning is not a topic to be taken lightly. Ensure that your tenants, family members, and friends are aware of the risks of carbon monoxide poisoning and what to do when their detectors are beeping by sharing this post. 

Carbon monoxide detector going off every 30 seconds
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Why is my carbon monoxide alarm going off every minute?

1 Beep Every Minute: Low Battery. It is time to replace the batteries in your carbon monoxide detector. 5 Beeps Every Minute: End of Life. This type of chirp indicates it is time to replace your carbon monoxide alarm.

Does a carbon monoxide detector go off continuously?

Does a carbon monoxide detector go off continuously? Most carbon monoxide detectors will continue to sound their alarm until the level of carbon monoxide in the air drops back to an undetectable level. Most detectors beep four times followed by a pause and continue to do this while carbon monoxide is present.

What can falsely set off a carbon monoxide detector?

A carbon monoxide (CO) detector false alarm may be caused by a few things including its proximity to fuel-burning appliances, exposure to humidity, or the low quality of the device itself. As the detector works to keep you and your home safe, the slightest environmental changes may cause more worry than peace of mind.

How many times will a CO detector go off?

To warn of dangerous CO levels, most detectors will beep 4 or 5 times in a row about every 4 seconds.