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Support for your Dyson Purifier Humidify+Cool Autoreact

Dyson Purifier Humidify+Cool Autoreact PH3A (White/Nickel)

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Getting started

Watch our getting started video to help you get up and running quickly.

Dyson Purifier Humidify+Cool ready to be assembled

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Using your machine

  • Watch how to use the Auto modes

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    Auto purify and humidify

    When both Auto modes are selected, your machine constantly monitors your air quality, automatically adjusting airflow to reach and maintain the most comfortable humidity level.

  • Watch how to use Airflow modes

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    Airflow modes

    You can use your remote control to change airflow modes. Choose between Fan mode, Backwards airflow mode mode and Breeze mode. Watch the video to learn more about each airflow mode.

  • Watch how to use Night mode

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    Night mode

    For quiet times or when sleeping, turn on Night mode using your remote control. Your machine will then use its quietest settings, with a dimmed display.

  • Watch how to use the Sleep timer

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    Sleep timer

    To turn your machine off automatically after a selected amount of time, press the Sleep timer button on your remote control. Then select the amount of time you want your machine to run for.

Helpful tips for best performance

Understanding your LCD screen icons

The icons on the built-in-LCD screen show you which pollutants are present, reporting them in real time. They also tell you about humidity and filter life, and will alert you when it's time to run a Deep clean cycle.

  • Indoor Air Quality Index (AQI)

    Shows your air quality over the last 12 seconds, or over the last 24 hours. 

  • Particulate matter PM2.5

    Your machine is sensing microscopic particles smaller than 2.5 microns, including smoke, bacteria and allergens.

  • Particulate matter PM10

    Your machine is sensing particles smaller than 10 microns, including pollen, dust and pet dander.

  • Volatile Organic Compounds (VOCs)

    Your machine is detecting gases released from a wide range of sources, such as aerosol sprays and air fresheners. 

  • Nitrogen Dioxide (NO₂)

    Your machine is detecting oxidising gases such as NO₂ released by combustion. Includes cigarette smoke, candles and car emissions.

  • Indoor temperature

    Shows the room's temperature.

  • Relative humidity info screen

    Shows the current humidity level in your room.

  • Humidification dial

    Shows the current room humidity in grey, and the target humidity level in blue. 

  • Humidifying to 50% target

    Shows your machine is humidifying to reach the set 50% target.

  • Humidifying to Auto target

    Shows your machine is humidifying to reach the Auto target.

  • Humidification target met

    Shows your humidification target has been met. 

  • Humidification target lower than room humidity

    Shows your target humidity is less than the current room humidity.

  • Filter life

    Shows how much filter life remains on your combination filter, so you know when to replace it.

  • Evaporator status

    Indicates how full the evaporator is with build-up, and how soon a Deep clean cycle is required.

  • Refill tank

    Shows it's time to refill the water tank.

Understanding pollutant levels

When a pollutant causes the air quality to drop, the relevant icon will appear on the LCD screen. The colored bar on the left of the screen will indicate how much of the pollutant is present, and will continually update as your machine purifies the air. 

  • Good

    When the green section of the colored bar is highlighted, your machine is detecting a very low level of the type of pollutant. 

  • Fair

    When the yellow section of the colored bar is highlighted, your machine is detecting a moderate level of the type of pollutant. 

  • Poor

    When the orange section of the colored bar is highlighted, your machine is detecting a high level of the type of pollutant. 

Very poor

When the red section of the colored bar is highlighted, your machine is detecting a very high level of the type of pollutant. 

Extremely poor

When the dark red section of the colored bar is highlighted, your machine is detecting an extremely high level of the type of pollutant. 

Severe

When the purple section of the colored bar is highlighted, your machine is detecting a severe level of the type of pollutant. 

Maintaining your machine

How to run a Deep clean cycle

The monthly Deep clean cycle removes limescale from your machine's water system. Your machine's LCD screen will let you know when it's time. You'll need 150g of citric acid, then follow the steps in our video guide or user manual.

Play the video. How to maintain your machine.

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Information icon

We recommend only using citric acid when running a Deep clean cycle. It's a safe, natural cleaning agent, and is widely available.The cap on the water tank contains power connections. When you fill the tank or run a Deep clean cycle, make sure the cap is completely dry before refitting.

 

 

It's quick and easy to run a Deep clean cycle

You can run a Deep clean cycle in nine simple steps. After pressing the Deep clean cycle button on the front of your machine, start by following steps one and two.

  • Remove the filter covers and water tank

    Push down on the release buttons to remove the filter covers. The inner door will spring open. Push down the water tank release buttons. Slide the water tank out of your machine and unclip the cap.

  • Remove the evaporator

    Remove the evaporator from your machine, place it in the water tank and refit the cap.

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After completing steps one and two, take the water tank to the sink and follow steps three to nine – as shown on your water tank's sticker.

 

  • Prepare the cleaning solution

    Remove the cap and evaporator. Fill the water tank halfway to the Max level with cold tap water. Add 150g of citric acid and shake gently until all the citric acid has dissolved. Place the evaporator back in the tank and fill to the Max level with cold water.

  • Replace cap and secure clips

    Make sure you wipe off any excess water to avoid drips.

  • Start the Deep clean cycle

    Slide the water tank into your machine. When prompted by the LCD screen, press the Deep clean cycle button. The Deep clean cycle will start and a countdown timer will appear.

  • Remove the water tank

    When the LCD screen shows the Deep clean cycle is complete, push down the water tank release buttons. Slide the water tank out of the machine and carry to the sink.

  • Rinse the evaporator and water tank

    Unclip the cap, take the evaporator out of the water tank and rinse under a cold tap. Wipe away any excess water. Rinse the water tank under a cold tap. Wipe the inside of the water tank to remove any excess solution and any debris.

  • Fill the water tank with cold water

    Refill the tank to the Max level, wipe off any excess water and replace the cap.

  • Reinsert the evaporator and water tank

    Push the evaporator back into your machine, close the inner door and replace the filter covers. Slide the water tank back into your machine.

  • How to change your filter

    Find out how to monitor and replace your combination filter in our video guide.

  • How to replace your filter

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Frequently asked questions

How can Auto mode help me achieve the most comfortable humidity level?

The most comfortable humidity level varies depending on the temperature. In Auto mode, your machine constantly monitors air quality, automatically adjusting airflow to reach and maintain the most comfortable humidity level.

How often does the filter need to be changed?

The combination filter needs to be changed every 12 months, based on 12 hours’ use a day.

How long can my machine humidify for?

With a full tank, your machine can humidify continuously for up to 36 hours in fan mode 1.

Can I switch off humidification?

Yes. The machine works as a purifier humidifier fan, or just a purifier fan.

How often should I run a Deep clean cycle?

This depends on the water hardness where you live. The machine prompts you to run the cycle once a month in hard water areas. It prompts you less often in softer water areas. 

Will the humidifier overheat if it runs out of water?

No. It has a sensor to detect if it’s out of water. The screen alerts you to refill your water tank when needed.

Where should I place my machine?

Your machine is engineered to purify and humidify single rooms, so you should use it where you spend the majority of your time at home. 

 

When placing the machine, make sure there's at least a few feet of clearance on all sides, so that the air can circulate effectively. Place away from radiators, drafts or air vents. Turn air conditioning off, and keep doors and windows closed during use. 

Should I change the fan speed for different times of the day?

If you need a quieter environment, set your machine to fan speeds 1-4, or consider selecting Night mode. Your machine will then use its quietest settings, with a dimmed display.

Should I change the fan settings in different seasons?

Increasing airflow will create a cooling effect using purified air, so you may find it beneficial to change your purifier's speed settings as the temperature changes. For personal cooling, use settings 4-10. In colder periods, enable Backwards airflow mode. It projects air through the back of the machine, to avoid unwanted cooling.

Does the LCD display stay on throughout the night?

If you're concerned by the brightness of your purifier's LCD display, consider enabling Night mode using your remote control. During operation, a small moon icon indicates that your purifier is on, but the main display turns off after 10 seconds to help avoid sleep disturbance.

How do I know when my purifier humidifier fan is in Auto mode?

If Auto mode is enabled, AUTO will be illuminated on your machine's LCD display. When purifying the air, AUTO will be in white. When the air in the room is purified, it will turn green and your purifier will remain idle until pollutant levels rise.

How long should my machine be turned on for?

Your purifier humidifier fan's auto mode is designed to manage the air quality in your home without you having to operate the machine – so it's only on when it needs to be. If you or someone in your home suffers from allergies or respiratory illnesses, we particularly recommend using Auto mode.

Should I keep my windows open or closed?

Your purifier works most efficiently in a sealed environment – opening the windows can allow more pollutants to enter the air in your home, which means your machine will take longer to work.

Replacement parts

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  • Machine Information

    Helpful tips to get the most out of your machine and keep it working at its best.

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