Support for your Dyson V12 Detect Slim™ vacuum

Here you can find helpful tips and advice, how-to videos, your user manual and more.

User manual

Download the user manual for your Dyson V12 Detect Slim™ vacuum cleaner.

Register your machine

Register to activate your guarantee for instant access to how-to guides, user manuals, and more. You can also receive tailored support, straight to your inbox.

Getting started

Watch the quick-start video

Our video shows you how to assemble and set up your vacuum, so it's ready to use.

Charge fully before first use

It's important to fully charge the battery before using your vacuum for the first time. This helps the battery monitoring system's algorithm more accurately calculate remaining run time.

Getting to know your LCD screen

How the graph works

As you vacuum, a piezo sensor counts and measures the microscopic particles picked up. Results are displayed in a graph on-screen, with particles ranked into four sizes, from 0–500 microns (µm) and above.¹

¹Best accuracy achieved in Auto mode. Auto ramp feature in Auto mode only. Testing based on average in home usage according to Dyson internal test data. Microscopic dust is defined as particles less than 100 microns.

Yellow bar

>10µm – particles as small as allergens and pollen

Orange bar

>60µm – particles as small as microscopic dust and skin flakes

Pink bar

Microscopic particles representing dust mites and fine sand

Purple bar

>500µm – particles as small as sugar granules

Powerful cleaning, measured in microns

The graph is available in all power modes, with all accessories. Like our famous transparent bin, it shows how much dust you've removed after every clean. To reset the graph, charge for 30 minutes, or remove the battery for 15 seconds.

How do I know I've achieved a deep clean?

When lots of dust is being vacuumed, the graph rises quickly. But as less and less dust is picked up, it slows down, letting you know you've achieved a thorough deep clean.

FAQs about the particle count graph

Why would I change the motor sensitivity? And how do I do that?

In Auto mode, the motor – which controls suction power – intelligently reacts to the amount of dust detected to provide a deeper clean, automatically. More dust, more power. Adjusting the motor sensitivity in the settings menu affects how responsive your machine is to the level of dust detected. Set to ‘High’, and your machine will react more often, and provide more suction power, when a smaller concentration of dust is detected. Set to ‘Low’, and suction power will react less often, and to larger amounts of dust. To change the motor sensitivity, hold the selection button beneath the LCD screen to enter the settings menu. Then tap the button to scroll through to the motor sensitivity settings. Hold to select, then choose your preferred setting.

Does the particle count graph work with all cleaner heads, tools and accessories?

Yes. The graph works independently of the attachments, and can be used with all cleaner heads, tools and accessories.

Can I reset the screen to see the dust levels in a different room?

To reset the particle count, either charge your machine (the count will reset after 30 minutes of charging) or remove the click-in battery for 15 seconds before replacing. The vacuum can be purged of any residual dust in the cleaner head or wand by activating suction away from any surface for 10 seconds.

Why can the vacuum filter down to 0.3/0.1 microns but only detect particles down to 10 microns?

While we can measure particles as small as 0.1 microns in the lab, it’s not yet possible to fit these measurement technologies into a vacuum cleaner. What we can't yet detect with our piezo sensor, we can filter out. Our advanced filtration captures 99.99% of particles as small as 0.3 microns.

Your LCD screen also displays

Second-by-second run time

Remaining run time is shown on screen in a second-by-second countdown, which constantly updates in real time, according to the power mode you select.

Maintenance alerts

To help maintain performance, your vacuum will remind you when it's time to recharge the battery, or clean the filter. It'll even help you clear any blockages.

Settings, alerts and notifications

To enter the settings menu, hold the selection button. Tap the button to scroll through the options, hold to select. Pull the trigger at any time to start vacuuming.

Select language

Choose your preferred language.


Turn screen and audible maintenance alerts on/off.

Particle count

Switch the particle count graph on/off. When the graph is turned off, the LCD screen shows power mode and remaining run time during cleaning.

Motor sensitivity

In Auto mode, suction power is automatic. More dust, more power. Set motor sensitivity to 'High', and auto suction reacts more often, to lower amounts of dust. Set to 'Low', and it reacts less often, with higher concentrations of dust.

Battery empty

Please charge your battery. Your machine will stop when the charge has been depleted. When run time is low, your machine will pulse three times to alert you.

Filter not sealed

The filter section is not fully interlocked. The on-screen animation shows you which sections to look at.

Airways blocked

A blockage has been detected. Watch the animation to see which airways to check. Your machine will also pulse seven times to alert you.

Filter wash

Your filter needs cleaning. Follow the advice further down the page to wash your filter.

Boost advice

If you use Boost mode frequently, this message will appear, to help you conserve battery life.

Getting to know your power modes

Your vacuum has three power modes, each designed for different tasks. Change power mode quickly by tapping the selection button.

Auto/Med mode

The optimum balance of power and run time. Med mode applies when a non-powered tool is attached.

Eco mode

Maximum run time, for longer cleans all around your home.

Boost mode

For the toughest tasks. Designed for quick, intensive cleaning of ground-in dirt.

Intelligent suction power

Dyson recommends Auto mode for the best experience. In Auto mode, suction power automatically increases when higher concentrations of dust are detected. Once the dust is removed, power returns to normal to conserve the battery.2

2Suction optimisation works in Auto mode only.

FAQs about power modes and LCD screen

What's the difference between Auto and Med mode?

Both modes provide the optimal balance of power and run time. Auto mode works with all cleaner heads and the Dyson Hair screw tool, and automatically adjusts suction power to match the level of dust detected. Med mode is displayed instead of Auto mode when non-powered tools are attached, e.g. the Crevice tool.

How do I change the screen’s language?

Hold the selection button to enter the settings menu. Hold the ‘Select language’ option to view the languages available. Tap the button to scroll through the list. When you reach your preferred language, hold the button to select. If you select the wrong language, release the button before the countdown ends. To confirm the language, hold the button until the countdown ends.

Does the screen use up the battery?

The LCD screen only uses up to 1.5 watts of power, which won't noticeably impact run time.

Getting to know your cleaner heads

You can use two different Dyson-engineered cleaner heads with your Dyson V12 Detect Slim™ vacuum.

Laser Slim Fluffy™ cleaner head

25cm-wide cleaner head engineered with soft nylon and anti-static carbon fibre filaments to remove dust from hard floors and narrow gaps. With a low profile to reach further under furniture.

Direct drive cleaner head

Drives stiff nylon bristles into carpets to capture ground-in dirt. The motor is integrated into the cleaner head brush bar for powerful, uninterrupted edge-to-edge cleaning.

FAQs about cleaner heads

Does the laser work across all floor types? What about lighting or sunlight?

The laser is optimised to work on any smooth, hard floor – including white surfaces and wood laminate. The laser effect is visible in up to roughly 500 lux ambient light – about the same as a well-lit kitchen space. Direct sunlight is in the order of 10,000+ lux and not possible to outshine.

Why use a green laser?

The human eye has evolved to be more sensitive to green light than any other colour, helping to enhance contrast and revealing more invisible dust.

Is the laser safe for children and pets?

Yes. The laser is Class 1 – the safest there is in all conditions.

Can I turn the laser on and off?

Yes. The laser can be turned on or off using a slide button on the cleaner head.

Do I need to provide any special care to maintain the laser's performance?

The laser can be wiped clean with a microfibre cloth.

Is the laser waterproof?

It is not waterproof.

Why is the laser only on the hard floor Dyson Laser Slim Fluffy™ cleaner head, not on cleaner heads engineered for carpets?

This is a hard floor only technology. The laser effect does not work on carpet, and would not be useful on the Direct drive cleaner head.

Will disabling the laser extend run time?

No. The laser uses roughly 1W of electrical power, far too tiny to have a noticable impact on run time.

Powerful 3-in-1 cleaning

In just one click, your vacuum transforms to a mattress cleaner. It can also be used as a handheld cleaner, with a choice of accessories to clean hard-to-reach areas all around your home.

Dyson-engineered accessories

Our accessories add even greater versatility. Each can be attached to the wand for cleaning up high, or directly to your machine for handheld cleaning.

New hair screw tool

Picks up long hair and pet hair. Fast. Anti-tangle conical brush bar spirals hair off and into the bin. Motor-driven cleaning for small spaces.

Light pipe crevice tool

Crevice tool with LED lights lets you reach into dark, narrow spaces and see where you’re cleaning.

Reach-under tool

Bends to comfortably reach down low. Engineered to clean further under furniture by adjusting the wand angle up to 90°.

Crevice tool

Engineered for precise cleaning around tricky edges and into hard-to-reach narrow spaces.

Mattress tool

Removes dust, dirt and allergens from mattresses, futons and upholstery.

Stubborn dirt brush

Stiff nylon bristles dislodge ground-in dirt from coarse carpets, high traffic areas and car interiors.

Up-top adaptor

Bends and locks at different angles. Fits any compatible tool for effective cleaning in high, hard-to-reach areas of your home.

How to set up your wall dock

You can use the wall dock to store your vacuum, so it's always on hand and ready to use. Watch how.

Getting the best from your battery

Charging the battery

You can charge your battery on or off the machine, and on or off the wall dock.

Changing batteries

If you have an additional battery, you can achieve 120 minutes of run time in Eco mode. Swap batteries quickly by pressing the red battery release button, and sliding the battery off your machine. Your extra battery clicks into place.

Charge between cleans

It can take up to 4.5 hours to fully charge your battery. When the green tick is displayed, charging is complete.

Leave it charging

Your battery is designed to be left plugged in, so it's always ready to use.

Looking after multiple batteries

If you have an additional battery, we recommend fully charging it soon after purchase, and alternating batteries regularly to prolong battery health.

Storing your batteries

If you're not using your batteries, we recommend storing them with a charge of 30%.

FAQs about the battery

How long does the battery take to fully charge?

A full charge takes up to 4.5 hours.

How will I know if the run time is getting low?

Run time is displayed on the LCD screen, and your machine will pulse three times to alert you if it's getting low.

Can I charge my batteries on and off my machine?

Yes, your swappable battery packs can be charged on or off your machine, on or off the dock.

What's the best way to use an additional battery?

We recommend alternating your batteries regularly to prolong battery health.

Can I leave my vacuum on charge?

Yes, the battery is designed to be left on charge, to ensure your vacuum is ready for the next use.

Should I charge my vacuum after every use?

We recommend charging your machine after every clean to maximise run time.

Maintaining your machine

How to clean your vacuum

Cleaning removes dust build-up and helps optimise performance. The filter and brush bar in the Dyson Laser Slim Fluffy™ cleaner head can be washed, and the bin and tools wiped clean.

Why it's important to clean your filter regularly

The filter captures microscopic dust, which can accumulate and affect performance. Help maintain suction by washing the filter at least once a month, or more frequently if used heavily.

How to clean your filter

1. Remove your Dyson filter
Remove your filter by unscrewing the post-motor filter from the machine.
2. Remove excess dust
Tap your filter lightly on the side of the sink or in the bin, to remove any loose dust and debris.
3. Rinse filter
Wash your filter with warm tap water – gently rubbing it with your hands. Don't use detergents.
4. Give it a firm shake
Fill your filter with warm tap water. Cover the open ends with your hands and shake firmly to remove the dirt. It's important not to agitate the filter media, i.e. the pleated elements. Repeat until the water runs clear, and then firmly shake the filter to remove all excess water.
5. Leave to dry for 24+ hours
After washing your filter, leave to dry for at least 24 hours in an area with plenty of airflow, such as beside a fan or open window. When drying, position the filter with the larger end on the surface. Your filter must be completely dry before you put it back into the machine, or it could damage the motor. Don't dry in a tumble dryer, microwave or near a naked flame.

Don't overfill the bin

Overfilling the bin can reduce suction and affect the accuracy of the particle count. To maintain suction, empty as soon as debris reaches the MAX marker.

Removing blockages

Your LCD screen will alert you if there's a blockage in your machine's airways. On-screen animation shows you which airflow pathways to check.

Washing the Dyson Laser Slim Fluffy™ brush bar

You can wash your Laser Slim Fluffy™ cleaner head's brush bar in warm water.

FAQs about maintenance

How will I know if there’s a blockage in my vacuum?

Your machine will pulse seven times to alert you if there’s a blockage. You can follow the animated guide on your LCD screen to clear it.

How often should I clean the filter?

The LCD screen on your machine will remind you when it's time to clean your filter. This will usually be around once a month, but may be more frequent if you use your machine more heavily. After cleaning the filter, always leave it to dry for at least 24 hours. You must ensure it's completely dry before refitting. We recommend following the cleaning instructions and cleaning by hand. The filter is not suitable for dishwasher use.

Does this vacuum connect to the Dyson Link app?

Your machine works independently and doesn't currently connect to the Dyson Link app.

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