It’s the classic story with so many appliances. Out of the box, your robot vacuum works great but over time, that peak performance degrades and a few months later, it starts underperforming so much you think it’s broken.
However, with robot vacuums, it’s very possible that your machine isn’t underperforming; you’re just unknowingly sabotaging it.
“A common misconception among consumers is that these devices are totally ‘set and forget,’ requiring zero upkeep once they start their rounds,” says Ryan Wu, the head of Narwal Americas, a global leader in robot vacuum manufacture. “Despite how sophisticated their automation has become, it’s important to give them a little TLC from time to time.”
Five common robot vacuum mistakes and how to correct them
The Spot+Scrub is the company’s first wet and dry robot vacuum but it comes with many of the features we expect from the top-tier models.
There are a number of common mistakes that many robot vacuum owners make without realizing it, some of which can dramatically impact your bot’s ability to do its job.
“Most issues show up as reduced pickup and inconsistent coverage. Restricted airflow (a full bin/base, clogged filter, or blocked pathway) can make a robot look like it’s cleaning while leaving debris behind,” said Ryan Hruska, SVP of Product Development, Robotics, at SharkNinja. “If your robot vacuum doesn’t have anti-hair wrap capabilities, that can also add resistance, which may increase wear over time. And if a robot struggles to dock or gets stuck repeatedly, you’ll often see more partial cleans and unnecessary battery drain.”
Here are some of the most common issues robot vacuums encounter, and how to fix (or completely avoid) them.
Mistake 1: Not setting up properly before the first run
We install and use the app each robot vacuum comes with, evaluating its ease of use and setup.
The first thing you want to do with any new device is start playing with it when you unbox it, especially something novel like a robot vacuum. Before you launch it blindly into your home, however, it’s important you do some initial setup.
“It’s critical that you set up the vacuum correctly before starting the first cleaning session,” Wu says. “Understanding the layout of homes — tight spaces, narrow hallways or small corners — greatly benefits cleaning performance. After unboxing the vacuum, users should allow it to complete an initial mapping run.”
Hruska concurs. He says one stumbling block is not completing a quick, robot-ready setup, “Leaving cords, small items, or fringe rugs in the robot’s path. Most robots, including ours, are designed to navigate around everyday obstacles, but a quick pickup helps ensure the most consistent clean.”
It’s also important to choose a good spot for the dock. “Placing the dock in a tight corner or under furniture can interfere with docking and recharging. Give the dock space so the robot can return and charge reliably.”
The Dreame X50 Ultra was able to use its lift arms to climb over the base of this chair that almost every other robot gets stuck on.
After the first run is complete and your bot has a sense of the area it’s supposed to clean, you can tweak it for optimal performance.
“Users can make customized adjustments within the app tailored to their specific home environment,” Wu says. “By regularly updating the layout and map, the robot always knows where it can and cannot go.”
This is especially important if you move some furniture around or add anything new that might impede your vacuum. It’s also essential after big changes to your home, like a remodel, or if you want to assign the robot a new area to clean.
Mistake 2: Treating it like a traditional vacuum
Cordless and robot vacuums can do a great job of cleaning your floors, but some are better on carpets.
Another common mistake is treating a robot vacuum the same way you treat a traditional upright or canister vacuum. Robot vacuums are intended for frequent light cleaning, not the deep cleans a traditional vacuum is used for.
If you run your robot vacuum too infrequently, it may lead to debris buildup that will overwhelm the machine’s brushes and dustbin. The same is true if you use it on big messes, like piles of pet hair, food spills or construction debris.
“Robots tend to perform best when they run regularly (daily or a few times a week),” Hruska says, “so they maintain floors instead of trying to tackle heavy buildup.”
We weigh the robot vacuum’s dustbin to see how much it’s picked up.
It may seem obvious but one of the most important things you can do to keep your robot vacuum running well is to frequently empty the dustbin. Unlike traditional vacuums, robot vacs tend to have much smaller dustbins, even if they also include bins on the dock. Even a partially full bin can seriously impact suction. For models with only onboard bins, you should empty them after each run for optimal performance.
Beyond that, focus on setting realistic schedules based on home size, pets and flooring. Homes with multiple pets or deep carpet will likely need more frequent runs than no-pet homes or those with hardwood flooring throughout.
Mistake 3: Ignoring hidden areas that need cleaning on the vacuum itself
Robot vacuum brushes have gotten better at not getting hair tangled around itself but sometimes you still need to help it out.
Even if you’re giving your machine an occasional once-over, there’s a good chance you’re not fully cleaning the most vulnerable parts of the vacuum.
“Beyond just emptying the dustbin, it’s crucial to regularly check and clean ‘hidden’ spots that keep everything running smoothly,” Wu advises. “When sensors are obscured or brush rolls are tangled, the robot’s navigation and suction power drop significantly. It’s recommended to check brushes, filters, sensors, and wheels every few weeks, or more frequently if there are long-haired pets at home, along with a process that includes simple tasks such as cutting away tangled hair. A quick five-minute tune-up is essential for longevity.”
Regular maintenance and cleaning can not only make your vacuum run better but it can also extend its life. For a complete overview on how to deep clean a robot vacuum, check out our guide.
Mistake #4: Neglecting digital health and firmware maintenance
The Roomba j7 Plus comes with a charging dock that also empties the robot’s dustbin. Dirt is collected in handy disposable vacuum bags.
It’s not just the physical robot that needs some regular TLC. A robot vacuum is a complex electronic device, so maintaining its digital health is just as vital.
“While robot vacuums typically receive automatic firmware and app updates in the background,” Wu says, “technical issues can sometimes interrupt this process. Failing to update can lead to persistent bugs or missed performance enhancements. Checking for firmware and app updates periodically helps ensure your device gets new features and continues to perform smoothly.”
Updating your bot’s firmware can not only fix bugs and mapping issues but also help the machine run more efficiently and extend its battery life. Similarly, app updates can help your vacuum map an area more precisely or even add new functionality that wasn’t available out of the box.
In some of our own testing at CNET Labs, we’ve seen robot vacuums improve their object avoidance capabilities after firmware updates.
Mistake #5: Not fully understanding mapping and navigation features
The Z70 can map the location of objects and will return after cleaning to pick them up.
In a similar vein, many owners don’t take full advantage of some of the features available in their bot’s app or the machine itself. One key example is mapping functionality. The difference — for instance — between quick mapping, which just builds a basic layout the bot can follow, or full mapping, which constructs a detailed, high-resolution map that may include tight or hidden spaces and optimizes navigation routes. Many models offer even more in-depth and specific mapping options.
Wu recommends owners “dig into their devices’ smart mapping and scheduling features, rather than just running the vacuum on a generic, whole-house cycle. By setting specific ‘No-Go Zones’ and scheduling high-traffic areas like the kitchen and hallways for more frequent cleaning than the guest room, consumers will get more efficient cleaning results.”
Many robot vacuums also include the ability to store maps for multiple floors and switch them before starting a run, or the option to label rooms or zones and set the machine to only clean a preset selection. Spending a few minutes checking out some of the functionality available can significantly improve your bot’s performance and efficiency.
Robot vacuums are low effort, not no effort
Shark’s newest robot vacuum uses UV light to detect old and dried stains on your floor.
As Hruska points out, if you do run into a problem, there’s no need to panic.
“If performance drops suddenly, start with the basics: check for airflow restrictions (bin/base/clogs), remove debris from the brushroll and ensure sensors are clear. Fortunately, most robots today include features like self-emptying bases and self-cleaning brushrolls to significantly reduce the frequency of hands-on maintenance.”
Many of the performance issues that crop up with robot vacuums stem from user mistakes. With the proper setup and regular maintenance, a robot vacuum can provide years of reliable service. It’s important to treat your bot as a smart device, not a disposable gadget. It’s also important to remember that as robot vacuums get smarter, digital maintenance may matter just as much as physical cleaning.
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