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Why Is My RV Carbon Monoxide Detector Beeping?

It’s colorless, odorless, can make you sick or kill you — and it could be inside your RV right now. We’re talking about carbon monoxide (CO), the potentially deadly gas produced by several RV systems and appliances. If you have an RV carbon monoxide detector that’s beeping, you may be concerned.

Let’s take a closer look at what you need to know in this situation.

My RV Carbon Monoxide Detector Is Beeping…Now What?

If your RV carbon monoxide detector is beeping, your first concern shouldn’t be making it stop. It should be addressing whatever issue is causing the beeping in the first place. Even in a best-case scenario, your detector is having problems that might prevent it from detecting hazards. In the worst case, your RV may already contain dangerous carbon monoxide gas.

How to replace an RV CO/Propane Gas Alarm

What Is Carbon Monoxide?

Carbon monoxide is a highly toxic gas made up of one carbon atom and one oxygen atom. It is produced by the incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, oil, and wood. When inhaled, CO reduces the blood’s ability to transport oxygen, leading to oxygen deprivation in the body’s tissues and organs. This is why having an RV carbon monoxide detector is so essential.

How Does an RV Carbon Monoxide Detector Work?

These crucial little devices are actually relatively simple from a mechanical perspective. The primary sensor can work in one of three ways: biomimetics, metal oxide semiconductors, or electrochemical sensors

Biomimetics uses a gel that changes color as it absorbs carbon monoxide. The detector monitors this color and alerts if the carbon monoxide hits a certain threshold. Metal oxide semiconductors, on the other hand, take advantage of CO’s tendency to lower electrical resistance in circuits. If enough carbon monoxide is present to change the functioning of a circuit, your alarm goes off.

Electrochemical systems are the least common. They work using electrodes immersed in a chemical solution. These can often instantly reveal the presence of carbon monoxide and are primarily found in professional settings. 

Pro Tip: Is the beeping in your rig driving you crazy? These 10 Common Beeps and Alarms Your RV Makes may be the source of your madness.

RV Carbon Monoxide and Propane Detector
CO detectors are often installed on cabinetry near the floor of a camper.

Why Does My RV Carbon Monoxide Detector Keep Beeping?

A few common issues are responsible for the vast majority of carbon monoxide detector warnings. Let’s look at the obvious and not so obvious reasons your CO detector keeps chirping at you.

Carbon Monoxide

The worst and most serious reason why your RV carbon monoxide detector is beeping is CO gas. If that’s the case, you should get yourself, any fellow campers, and any pets out of the RV as soon as possible. This alert is a good thing in some ways. Your detector is working as intended and saving you from a potentially deadly situation.

After you vacate the RV, shut off the propane and make sure nothing is burning. Generator fumes that have blown back into the RV are a common culprit for setting off CO detectors too. If your generator is running when the detector goes off, shut it off immediately and get outside.

Low Battery

If your RV systems are functioning correctly, the most likely culprit for beeping is a low battery. Since your RV may not always have a continuous power supply, your detector relies on batteries. But they don’t last forever. Your specific detector will usually indicate how to tell if the batteries are low. If they are, you should replace them as soon as possible.  

Alarm Malfunction

RV carbon monoxide detectors aren’t perfect. Manufacturers take steps to ensure that if the system is malfunctioning, you’ll know. Consult your device’s manufacturer for potential ways to troubleshoot or reset your detector. These are somewhat complex devices, so it’s essential to pay attention to the specific ways to resolve your malfunction and ensure your device is working once again.

RV Carbon Monoxide and propane detector
This unit detects carbon monoxide and propane.

Replacement Necessary

Eventually, you’ll need to replace your carbon monoxide detector. Again, consulting any documentation from the manufacturer will help. Generally, a CO detector lasts about seven years. Many will start to beep or chirp occasionally when their life is at its end. This is a surefire way to get you to replace it.

We personally have experienced multiple CO detectors start to beep due to the end of life.

Error Notification

A variety of other issues could also cause errors. Whether it’s an issue with placement or any number of other things, your detector will make sure you know. If there’s an error, address it as soon as possible.

How Does Carbon Monoxide Get Into an RV?

Unfortunately, many different RV systems and other everyday items could create carbon monoxide issues. Some of the most common are built-in generators with improper ventilation and portable ones set too close to an open window. 

Pro Tip: Thinking about buying an RV with an onboard generator or installing one yourself? Find out Onboard RV Generator vs. Portable: Which Is Better?

portable RV generator
Always set your portable generator in an open area away from your RV windows to prevent fumes from entering your rig.

Additionally, many rigs have heating and cooking systems that use propane gas. Gas-powered water heaters can also be a carbon monoxide risk if damaged or not properly maintained. Even smaller, portable camp stoves can produce enough CO to cause health risks. Problems with any one of these systems or appliances could lead to carbon monoxide poisoning.

What Are the Symptoms of Carbon Monoxide Poisoning?

Carbon monoxide gas is invisible and odorless. Without a functioning detector, you may not know about an issue until symptoms begin. These include headache, dizziness, weakness, an upset stomach, chest pain, or confusion. In extreme cases, victims can lose consciousness and eventually die. While all of these symptoms could also describe other conditions, don’t take a chance if it might be CO gas.

How Do I Prevent Carbon Monoxide in My RV?

Carbon monoxide poisoning is a serious issue. But there’s no need to be afraid if you take a few simple, common-sense precautions.

Commonly Missed RV and Vehicle Maintenance Items | Preventing Catastrophic Failure and Breakdowns

Get and Maintain an RV Carbon Monoxide Detector

It should be obvious by now, but an RV carbon monoxide detector can be a true friend for all RVers. These small, affordable devices are hard at work 24/7, ensuring you and your fellow campers are safe. And they require very little maintenance or upkeep.

While any detector will work, getting one with a readout can be helpful to determine why they are beeping. They read out in PPM or parts per million. This feature is very helpful to determine if your stove or water heater leaks any CO into your living space.

Safe-T-Alert by MTI Industries 35-742-BL Dual...
  • Double-Duty Alarm Detects Both Gas Leaks And Co Gas...
  • Reliable 12V Power Means No Missing Or Dead Batteries To Replace....
  • Flush Mount

Pro Tip: Some RV carbon monoxide detectors also detect propane leaks. Learn how to Avoid Disaster With an RV Propane Detector.

Do Not Use Portable Camping Stoves or Grills in Your RV

Portable camping stoves or grills can be convenient but don’t use them indoors or in poorly ventilated areas. Even small amounts of residual carbon monoxide gas can build up over time. Always use any grills outside your rig. Set up in a location and manner that allows for adequate ventilation.

Properly Ventilate When Using Gas

When functioning properly, your RV’s gas systems shouldn’t pose any significant CO risk. Still, when using gas inside your rig, make sure you’ve got good ventilation. Appliances like generators, water heaters, or furnaces should have dedicated venting systems. However, cracking a window or opening a door while cooking can provide additional protection. 

Fantastic Fan
Vent fans, like the Fan-Tastic or MaxxAir units, can help keep your RV ventilated.

Don’t Ignore Your RV Carbon Monoxide Detector

If your RV carbon monoxide detector is beeping, don’t ignore it. No matter what it’s trying to tell you, it’s important and could even be a matter of life and death. Whether it’s a problem as simple as replacing batteries or as dangerous as a major CO gas leak, you’ll rest easier at night knowing your trusty detector is watching your back.

When was the last time you checked the carbon monoxide detectors in your RV? Drop a comment below.

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About Tom Morton

Tom, a Pacific Northwest native, is our technical genius. Born in Washington and raised in Alaska before settling in Michigan. He's the man who keeps our operation running, both figuratively and literally.

With a background in Electrical Engineering, Tom specializes in RV solar systems and lithium batteries. He made history as the first documented individual to use a Tesla battery module as an RV battery. Tom has personally assisted countless RVers with system installations and has educated thousands more through his videos and articles.

Cinematography is another of Tom's passions, showcased in his work on the Go North series. You can see his camera skills on display in The RVers TV show on Discovery Channel and PBS where he also stars as a co-host.

Tom's mechanical expertise extends beyond RVs to boats, planes, and all things mechanical. He's renowned for taking on maintenance and repair projects single-handedly and is often spotted underneath RVs, making him the technical backbone of our endeavors.

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Thursday 29th of June 2023

Great Article. We just replaced our unit with the unit by SafeT you refer in the article. I like that it also detects gas leaks! Keep up the good work

Samantha Nichols

Sunday 29th of May 2022

Thank you for your article. It will definitely help me a lot.

Samantha Nichols

Wednesday 18th of May 2022

I bought First Alert to replace the CO alarm in the RV. I was researching the model I had and didn't want to pay more than $70 for it so I researched alternatives and this model popped up on RV forums to buy. It's smaller than we had, but I prefer the smaller size better. It came with the battery already installed, so all I had to do was try to pull the protective plastic tab and it worked right away. I press the test button and everything seems to be working fine. I will be and will use this as a backup from now on. I'm glad Amazon carries these at an honest price.

Dalton Bourne

Sunday 17th of October 2021

I used this MTI Industries’ 35-742-BL Dual RV LP/CO Alarm and it's an excellent choice. I can install easily.  This device can detect both gas leaks and CO gas at the same time. It has a plug-in 12V power source, so I won’t ever need to replace any dead batteries. Besides that, this product can withstand the rugged environment of an RV and function at any temperature between 40 F and 158 F. Therefore, I feel fine when I travel.

Dalton Bourne

Monday 18th of October 2021

This Carbon Monoxide Detectors is fitted with everything a rig owner could want and does its jobs effectively.