What gases do carbon monoxide detectors detect?

Author: Willa Hickle  |  Last update: Tuesday, November 4, 2025

Answer: While a carbon monoxide detector is helpful to prevent carbon monoxide poisoning, you cannot rely on a carbon monoxide detector to detect a gas leak. A carbon monoxide detector will sense carbon monoxide, not raw fuel or gas fumes.

What other gases can set off a carbon monoxide detector?

Lead acid battery chargers produce hydrogen gas which sets off CO detectors. If you are charging your caravan or boat battery at home, this could set off your CO alarm. Once you have made sure that the alarm is false, it is safe to ignore the alarm in this scenario, but remain vigilant for other signs.

What kind of gas does a carbon monoxide detector detect?

Most CO detectors use a sensor with a defined, limited lifespan, and will not work indefinitely. CO is a colorless, tasteless, and odorless gas produced by incomplete combustion of carbon-containing materials. It is often referred to as the "silent killer" because it is virtually undetectable by humans.

What do carbon monoxide detectors pick up on?

These detectors are designed to measure the concentration of carbon monoxide in the air (in parts per million, or ppm) and sound an alarm if enough of the chemical is around long enough to become a problem. If detected over the course of a few hours, carbon monoxide at 70 ppm will trigger an alarm.

What makes a carbon monoxide alarm go off?

The carbon monoxide alarm going off could mean the gas is present in your home or office, or simply indicating the battery or alarm needs replacing. The deadly gas is a product of partial combustion of carbon-based compounds where there is not enough oxygen to create carbon dioxide (CO2).

Will a gas leak set off a carbon monoxide detector?

Can anything other than carbon monoxide set off a carbon monoxide detector?

In addition to this, some cheap carbon monoxide detectors can be set off by Hydrogen gas and some even claim that large quantities of petrol fumes can trigger false alarms.

What are two warning signs of carbon monoxide poisoning?

The most common symptoms of CO poisoning are headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion. CO symptoms are often described as “flu-like.” If you breathe in a lot of CO, it can make you pass out or kill you.

What if the carbon monoxide alarm goes off but no fire?

False or nuisance alarms are when your smoke detector or CO alarm goes off, but there is no presence of smoke or carbon monoxide in your home. However, if your smoke or carbon monoxide detector sounds indicating an emergency and you are not certain it is a nuisance alarm, evacuate the home and call 9-1-1.

What does 4 beeps mean on carbon monoxide?

What Does an Emergency Alarm Chirp Mean? This meaning is probably the most self-explanatory. When your carbon monoxide detector chirps 4 times in a row and pauses, this means it has detected unsafe levels of carbon monoxide. This means your entire household should evacuate immediately and seek fresh air.

Will my carbon monoxide detector detect a gas leak?

No, carbon monoxide (CO) alarms cannot detect natural gas leaks. They are designed to detect the presence of carbon monoxide, a poisonous gas formed during incomplete combustion of fuels like oil, gas, propane, and wood.

Should I call the fire department if the carbon monoxide alarm goes off?

If your CO detector goes off and you feel ill, leave the house and call 911 or the local fire department. If you do not feel ill, push your detector's reset button. If the alarm goes off again after a few minutes, open the windows, leave the house and call 911 or the local fire department.

What does 3 beeps mean on a first alert carbon monoxide detector?

1 beep every minute: This means that the alarm has low batteries and you should replace them. 3 beeps every minute: This means the alarm has encountered a malfunction and needs replacement. 5 beeps every minute: This means your alarm has reached the end of its life and needs to be replaced with a new alarm.

Can carbon monoxide detectors detect other things?

Many people believe the two gases to be the same thing because of the many properties that they have in common. A carbon monoxide (CO) detector cannot detect carbon dioxide (CO2), and a carbon dioxide detector cannot detect carbon monoxide.

Will opening a window help with carbon monoxide?

If you experience symptoms that you think could be from CO poisoning: DO GET FRESH AIR IMMEDIATELY. Open doors and windows, turn off combustion appliances and leave the house.

What things in a house give off carbon monoxide?

Carbon Monoxide sources in the home
  • Clothes dryers.
  • Water heaters.
  • Furnaces or boilers.
  • Fireplaces, both gas and wood burning.
  • Gas stoves and ovens.
  • Motor vehicles.
  • Grills, generators, power tools, lawn equipment.
  • Wood stoves.

How to tell if carbon monoxide is leaking?

What Are Signs of Carbon Monoxide in Your Home?
  1. Yellow or orange flames coming out of your gas appliances instead of the usual blue flame.
  2. Dark and sooty staining on or around gas appliances.
  3. Pilot lights that frequently blow out.
  4. Increased condensation on windows.
  5. Solid fuel fires burn much slower than usual.

What if the carbon monoxide detector goes off but then stops?

If you have a carbon monoxide detector chirping and then it stops, it's important to take the situation seriously, even if the alarm is no longer sounding. Even if the alarm has stopped, get everyone out of the home to a place with fresh air. Contact 911 or your local fire department to report the incident.

Can dogs detect carbon monoxide?

Carbon monoxide, commonly known as CO, is an odorless, colorless, and non-irritating gas. No pet can identify the gas because CO lacks any scent whatsoever. Exposure can lead to carbon monoxide poisoning in both humans and pets.

What can falsely set off a carbon monoxide detector?

Common causes of false alarms of carbon monoxide:
  • Close to cooking sources (10 feet minimum)
  • Close to sources of humidity (10-20 feet)
  • Near fireplaces.
  • Near water heaters.
  • Near furnaces.
  • Located in a poorly ventilated location like a garage, kitchen, or closet.

Does the fire department charge to check for carbon monoxide?

In most areas, the fire department does not charge to respond to carbon monoxide alarms or to check for the presence of CO in a residence. However, policies can vary depending on the jurisdiction or specific fire department. It's always a good idea to contact your local fire department for specifics on their policies.

Can your home have carbon monoxide without gas appliances?

Unless your house is all-electric (no gas appliances), the answer is yes. Carbon monoxide poisoning is often lethal and most homes have the potential for this tragedy.

Who can test my home for carbon monoxide?

Some municipal fire departments and utility companies will come to your home and check for carbon monoxide for free or at reduced rates. The main tool used in these tests is an electronic portable toxic multi-gas monitor.

What are the symptoms of gas leak exposure?

Symptoms from a natural gas leak may include:
  • headaches, sometimes severe.
  • dizziness.
  • fatigue.
  • nausea.
  • irregular breathing.
  • chest pains.
  • memory problems.
  • blurred vision.

Can you recover from carbon monoxide poisoning on your own?

If you have a mild case of CO poisoning, you'll feel better just by going outside and breathing fresh air. More severe cases may require treatment with pure oxygen or hyperbaric oxygen therapy (HBOT).

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