Incident 46: Nest Smoke Alarm Erroneously Stops Alarming

Description: In testing, Google Nest engineers demonstrated that the Nest Wave feature of their Nest Protect: Smoke + CO Alarm could inadvertently silence genuine alarms.
Alleged: Nest Labs developed and deployed an AI system, which harmed Fire Victims.

Suggested citation format

Yampolskiy, Roman. (2014-01-21) Incident Number 46. in McGregor, S. (ed.) Artificial Intelligence Incident Database. Responsible AI Collaborative.

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Sean McGregor


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Full Description

On May 21, 2014, Google Nest, producer of smart home products, issued a recall for its Nest Protect: Smoke + CO Alarm due to concerns that the Nest Wave feature could inadvertently silence alarms. The Nest Wave feature is designed to allow users to silence spurious alarms, for example while cooking, by waving a hand near the unit that triggered the alarm. In lab conditions, however, Nest engineers demonstrated that the Wave feature could be activated erroneously, raising the potential that the device could silence genuine alarms.

Short Description

In testing, Google Nest engineers demonstrated that the Nest Wave feature of their Nest Protect: Smoke + CO Alarm could inadvertently silence genuine alarms.



AI System Description

The Nest Wave gesture detection function of the Nest Protect: Smoke + CO Alarm. The feature is designed to allow the user to silence spurious alarms with a gesture near the device.

System Developer

Nest Labs

Sector of Deployment

Activities of households as employers

Relevant AI functions


AI Techniques


AI Applications

gesture detection


United States

Named Entities

Nest Labs, Google Nest, Google

Technology Purveyor

Google Nest

Beginning Date


Ending Date


Near Miss

Near miss



Lives Lost


Data Inputs

Motion sensor data

Incidents Reports

Late last September it was rumored that a smart smoke/carbon monoxide detector would join the now Google-owned Nest line of smart thermostats and was later announced in early October to a great response.

The Nest Protect, which retails for $129 in both a wired and battery powered variant, intelligently interacts with an iPhone app called Nest Home with warnings about low batteries (if applicable) and when alarms are active or about to be active. It also features a handy dismissal gesture for silencing a screaming alarm.

Some users, however, are reporting a number of unprompted false alarms unrelated to cooking or other reasonable instances. One user even reported the alarm stubbornly going off for 30 minutes in the middle of the night with no sign of smoke and ignoring prompts to dismiss the alarm after an apparent glitch in the device…

Several users have echoed a similar experience on a Nest Community support thread reporting cases where the Nest Protect hardware had to be replaced to resolve the issue with startling false alarms. Customers on Amazon have also reported false alarms with Nest Protect hardware.

Such an occurrence could be very inconvenient, especially if the Nest Protect were to warn you of smoke or carbon monoxide presence via its app while you’re away from the home.

After two weeks of using the Protect, just before bed when the system did its nightly self-check, I heard a voice that said something to the extent that the unit had failed and it needed to be replaced. Shortly after the warning, the device started to chirp and I received a notice on my iPhone about the unit failing. It’s pretty easy to silence a false alarm, but the chirp because of a failed device cannot be silenced and it happened right before bed.

For its part, Nest has been readily replacing reportedly defective units for customers after reports of such issues suggesting it could be a hardware related issue (as a software issue would surely exhibit the same behavior), and it’s often expected that first rounds of products offer bugs and kinks. What’s not expected for users is a product designed to remove friction from a classic appliance to add more frustration on its own.

1 of my 4 Nest protect units had a false alarm last night. A little before midnight, all 4 units beeped and loudly announced “There is smoke in the entryway”. The family got out of the house and I tried to find the source of the smoke. There was none. I brought everyone back in, scared, as the alarm continued and attempted to wave the alarm off. No response. I finally got a broom out, just like the commercial and pressed the button. “This alarm cannot be silenced”.

We’ve reached out to Nest for comment on the reports of false alarms experienced by customers and will update if we hear a response.

Could a firmware update resolve the issue for existing users? Have you experienced any false alarms yourself? Sound off in the comments below.

Is the Nest Protect fire alarm giving users false alarms?

One of the cool features Nest's smart smoke alarm, the Nest Protect, introduced was the ability for users to wave their hand to turn off a faulty smoke alarm. Turns out, it's not working so hot.

In a statement today from Nest CEO and cofounder Tony Fadell, he says that in lab tests the wave function could accidentally get set off, which could prevent the alarm from sounding in the case of a real fire. The company is encouraging all current Protect owners to connect their device to Wi-Fi to get the update that will disable the feature.

The Palo Alto-based company, best known for its learning thermostat, has decided to halt sales of the Protect in the meantime until the issue has been resolved. The company is expecting on having the wave feature fixed in two or three months.

Fadell says that there haven't been any real life incidents of this problem occurring that the company is aware of.

"We're enormously sorry for the inconvenience caused by this issue," reads the letter from Fadell. "The team and I are dedicated to ensuring that we can stand behind each Nest product that comes into your home, and your 100% satisfaction and safety are what motivates us. Please know that the entire Nest team and I are focused on fixing this problem and continuing to improve our current products in every way possible. If you don’t want to keep your Nest Protect smoke alarm, we will give you a complete refund."

The smart smoke alarm was launched in October of last year and is Nest's second product after the thermostat. The smoke alarm had a bunch of cool features over traditional smoke alarms, including a smartphone app that kept you updated of any problems and it could talk to you to tell you what to do in the case of an emergency.

By Fadell's account himself, the Nest Protect has been selling well--even with the steep price tag of $129. In an interview last November, he told Forbes that the company had already "ten of thousands" already online after only being shipped a week earlier.

This bad news for the company also comes only a week after news broke that a class action lawsuit against Nest was filed that claims its thermostats do not actually save energy as marketed. The lawsuit claims that the base of the thermostat heats up and is unable to accurately get temperature readings. The complaint is seeking over $5 million from the company for hundreds of thousands of Nest users.

The company was bought by Google in January of this year for $3.2 billion.

Google's Nest Stops Selling Its Smart Smoke Alarm For Now Due To Faulty Feature

ReadWriteHome is an ongoing series exploring the implications of living in connected homes.

Nest Labs’ sudden decision Thursday to halt sales of its smart smoke and carbon monoxide detectors surprised users and drew mixed reactions. But what looks at first glance like a black eye was also the sharpest thing the company could have done.

CEO Tony Fadell posted an online notice to consumers warning them that its Nest Protect smoke detectors aren’t actually that smart after all. The company discovered a bug in its algorithm for the Nest Wave gesture, a convenience feature designed to let people disable their alarms by waving their hand. The glitch—which only affects the smoke detector, not the company’s flagship Nest thermostat—makes it possible for users to accidentally turn off the alarm, raising safety concerns.

See also: Nest Wants To Be The Hub Of The Connected Home

Press reaction has been harsh. The Verge called it “a big setback.” The Next Web lauded the newly Google-owned company for “handling the issue admirably,” though in the same sentence, it also said the incident was an “awkward smudge on the company’s record….”

Such brickbats miss the point. Nest’s commitment to disclosure and proactive fixes (at least this time around) deserves praise, particularly if it can help set a standard for other Internet of Things vendors as smart gadgets proliferate in the real world.

What Nest Did

Nest’s FAQ on the issue states plainly that no actual customers have reported the glitch; the issue was discovered in lab tests only. To minimize the risk of users randomly disabling their alarms, the company is issuing a software update that disables Nest Wave pending a fix; it’s also taken the extra precaution of halting sales and offering refunds to any customer who requests one.

These efforts stop short of a full-blown product recall, but Nest is clearly taking this matter seriously, no strong-arming required. Nest came out on its own to fess up about the problems.

Tech products are prone to bugs and other unexpected issues. It’s a fact of modern life. And users often have to complain—at times loudly and vigorously—just to get a response from the company responsible. We do this when our phones don’t work the way they should, and suffer through nonsense like “you’re just holding it the wrong way.” Or when companies’ mapping cars wind up hoovering up our Wi-Fi data. Or when smart home products aren’t locked down enough to guard against hacking.

Why That Matters

All of these irritations have actually happened. Examples like the last one, though, are particularly disconcerting because they can actually put people at risk in their own homes.

A couple of months ago, Belkin drew fire for vulnerabilities in its WeMo line of smart home products. The main issue involved security holes and other weaknesses, including weak encryption and insecure authentication. But Belkin made things much worse by allegedly choosing to ignore them once outside researchers informed it of the vulnerabilities.

That’s what officials at IOActive, the security firm that found the problems, told me. The security warning prompted a federally funded security agency to issue an advisory urging customers to immediately disconnect their WeMo devices.

Having problems is never good. But ignoring them is even worse.

Nest did the right thing in a difficult situation. And knowing the company cares about the integrity of its product—so much so that it’s willing to risk looking bad to resolve problems—should give it more credibility, not less. Because no product or service is flawless. And if you can’t expect perfection, at the very least, you want to know that the companies you trust to keep you safe and secure take the responsibility seriously.

Perhaps co-founders Fadell and Matt Rogers learned some things from their time at Apple. They certainly did after the Nest thermostat experienced reboots and battery problems last winter. Hopefully they’ll stay the course now as they begin life at Google.

Feature image courtesy of Nest.

Updated to acknowledge previous issues with Nest’s other product, the learning thermostat.

Why Nest’s Smoke Detector Fail Is Actually A Win For Everyone

Nest Labs–a startup recently bought by Google which brings high style and web smarts to mundane household devices–is recalling Nest Protect, a smoke and carbon monoxide detector, over concerns that its alarm might fail to go off in emergency situations. The Consumer Product Safety Commission estimates that 440,000 Nest Protect units are affected by the problem.

Wednesday’s recall news, though important, isn’t quite as big a deal as it sounds like: It’s more of a formality, as the CPSC is officially alerting consumers to measures which Nest took on its own back on April 3. And the “recall” doesn’t involve Nest owners having to send the detectors back for repair; they were designed all along to update their own software over Wi-Fi, a feature which makes this unexpected development less of a disaster.

The risk relates to one of the detector’s most clever features, “wave to dismiss.” If the alarm goes off because of something which isn’t actually dangerous–like a little smoke wafting from your oven as you cook dinner–you don’t need to frantically whip a towel through the air or stand on a chair to turn it off. Instead, you can merely wave your hand and a motion detector inside Nest Protect will shut off the alarm.

Here’s the rub: The company concluded that there was a chance that the feature might malfunction, causing Nest Protect to stay silent in a situation that really is dangerous. There are no known examples of any harm coming to people or property because of the problem, but Nest decided to issue a software update which temporarily disabled the feature while it worked on a permanent fix.

On April 3, Nest disclosed the discovery of the potential hazard, issued the software update which shut off wave-to-dismiss, halted sales of new units and offered a refund to any Nest Protect owner who was unable or unwilling to perform the update.

Why the delay before the CPSC’s recall notice? The agency had its own technicians examine Nest’s solution for the issue and approve it–a process which took a few weeks. It considers the formal notification it published today to be a recall, even though the resolution involves the smoke detector self-installing the update. (And as before, consumers can also return the unit for a refund.)

Nest, meanwhile, says it’s finishing a new version of “wave-to-dismiss” which will bring back the feature while eliminating the malfunction. It’ll be part of another software update which the company plans to push out in the next few weeks, whereupon it will also resume sales of Nest Protect.

MORE: How a Thermostat Can Save the World

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Nest is Recalling Its Smoke Detector (But Don't Send Yours Back)

Nest, the smart sensors and controls company recently acquired by Google for $3.2 billion in cash, just officially announced a massive recall of 440,000 Nest Protect smoke and CO detectors due to the possibility of complete failure to sound an alert when triggered by an actual fire or CO threat. This recall is for one of the company's primary bread and butter products that requires being connected to the Internet for updates. The trouble is, though most consumers would have specific reason to connect a Nest thermostat to the Internet, so they can control home climates remotely, some might not bother to connect a smoke detector and CO alarm product.

This recall comes on the heels of an announcement by the company in April that they would stop selling the product due to a faulty feature called 'Nest Wave.' Wave gives users the ability to silence an alarming unit during an alarm or test simply by vigorously waving their arm at it. It sounds convenient doesn't? How many times have you burned something in the kitchen and wished you could have shut that detector the heck up, as you flap your dish rag at it?

The defect, however, is actually intrinsic to this feature's design. If there is activity near the detector during an actual fire, it may never sound. Not good. The remedy is connecting the Nest Labs Smoke + CO alarm to the Internet for a firmware update that will disable this feature. Again, however, if your Nest alarm isn't connected, you'll never get the update, hence the manufacturer's recall.

This defect and recall is an interesting reminder of why we need to go cautiously and conservatively into this great opportunity with the "Internet of Things." On the surface, a smart detector that will shut its trap when you know things are safe, is a great convenience feature. On the other hand, triggering that off switch based on movement ended up to be a really bad idea. And of course, an IOT-connected safety product that isn't actually connected to the IOT is what you call an island - an island of broken, potentially very dangerous product.

I tend to be an early adopter of technology but when it comes to safety products, there is no substitute for tried and true field performance data over decades of actual use.

When The IOT Fails: Nest Recalls Over 400K Smoke Detectors


The repair is an automatic electronic update that disables the Nest Wave feature and is delivered automatically to devices connected wirelessly to the Internet and linked to a Nest account. Consumers should take one of the following actions:

Consumers who have not connected their Nest Protect devices to their wireless network and linked them to a Nest account should immediately do so. The devices will automatically receive the update that disables the Nest Wave feature. Customers should confirm that their devices have been updated by going to Nest Sense on their Nest account mobile or web application and ensuring that the button for Nest Wave is off and grayed out. Instructions on how to connect to a network and disable the feature are available at or by contacting Nest Labs.

Consumers whose Nest Protect devices are connected to their wireless network and linked to a Nest account should immediately confirm the receipt of an automatic repair that disabled the Nest Wave feature by going to Nest Sense on their Nest account mobile or web application and ensuring that the button for Nest Wave is set to "off" and grayed out. No further action is required and consumers can continue to use their devices.

Nest Labs Recalls to Repair Nest Protect Smoke CO Alarms

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