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Dyson HEPA Big + Quiet Formaldehyde
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Please select the appropriate option

Looking after your purifier

To always get the best performance from your Dyson air purifier, it's important to regularly clean it and check for blockages.

Cleaning your purifier

If your machine is dusty, wipe it with a damp, lint-free cloth.

Troubleshooting image

Check the sensor

Check the sensor inlets on the left hand side of the conic amplifier for dust and debris.

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Check for dust

Look for dust and debris in the outer cover and in the conic amplifier.

Brush

Use a soft brush to remove the dust and debris.

Troubleshooting image

Don't use detergents

Don't use detergents or polishes to clean your machine.

Is there anything else we can help you with?

Please select the appropriate option

Switch off the machine

Press and hold the power button to switch off your machine.

Turn the machine back on

Press the power button on the screen to switch on your machine.

Has this resolved the problem?

We're glad the problem's been solved.

Please let us know if there's anything else we can help you with.

We need a little more information to help us solve your issue.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen. Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

Check the machine settings

The machine has three airflow speeds. Use Airflow speed 1 for a low fan speed and Airflow speed 2 for a high fan speed. When set to Airflow speed 0, the display screen will remain on and the machine will continue to monitor air quality but there will be no airflow.

Press the power button

If the display is working but there is no airflow, please check that the machine is not set to Airflow speed 0. Press the power button to cycle through to airflow speeds 1 and 2.

Has this resolved the problem?

Check the machine settings

The machine has three airflow speeds. Use Airflow speed 1 for a low fan speed and Airflow speed 2 for a high fan speed. When set to Airflow speed 0, the display screen will remain on and the machine will continue to monitor air quality but there will be no airflow.

Press the power button

When the purifier is switched on, it will resume at the same airflow setting that was set previously. Press the power button to cycle through airflow speeds.

Has this resolved the problem?

Looking after your purifier

To always get the best performance from your Dyson air purifier, it's important to regularly clean it and check for blockages.

Cleaning your purifier

If your machine is dusty, wipe it with a damp, lint-free cloth.

Troubleshooting image

Check the sensor

Check the sensor inlets on the left hand side of the conic amplifier for dust and debris.

Troubleshooting image

Check for dust

Look for dust and debris in the outer cover and in the conic amplifier.

Brush

Use a soft brush to remove the dust and debris.

Troubleshooting image

Don't use detergents

Don't use detergents or polishes to clean your machine.

Has this resolved the problem?

Reset the machine

Press and hold the power button to switch off your machine.

Troubleshooting image

Switch on the machine

Press the power button on the screen to switch on your machine.

Has this resolved the problem?

Waiting for data to stabilise

When the purifier is first switched on, it will take approximately 8-10 for the data to stabilise and the CO₂ readings to be displayed.

Has this resolved the problem?

Reset the machine

Press and hold the power button to switch off your machine.

Troubleshooting image

Switch on the machine

Press the power button on the screen to switch on your machine.

Has this resolved the problem?

Looking after your purifier

To always get the best performance from your Dyson air purifier, it's important to regularly clean it and check for blockages.

Cleaning your purifier

If your machine is dusty, wipe it with a damp, lint-free cloth.

Troubleshooting image

Check the sensor

Check the sensor inlets on the left hand side of the conic amplifier for dust and debris.

Troubleshooting image

Check for dust

Look for dust and debris in the outer cover and in the conic amplifier.

Brush

Use a soft brush to remove the dust and debris.

Troubleshooting image

Don't use detergents

Don't use detergents or polishes to clean your machine.

Has this resolved the problem?

Real-time reporting

The LCD screen displays the power mode setting and the CO₂ level in the room - reporting it in real-time.

Low CO₂

CO₂ is at a safe level.

Troubleshooting image

Medium CO₂

CO₂ is building up. It may be advisable to take preventative measures.

Troubleshooting image

High CO₂

CO₂ has built up to a level of concern. It's advisable to take action like opening a door or a window.

Troubleshooting image

Positioning the purifier

When placing the machine, ensure there are at least a few feet of clearance on all sides so that the air can circulate effectively. Place away from air vents and windows.

Looking after your purifier

To always get the best performance from your Dyson air purifier, it's important to regularly clean it and check for blockages.

Cleaning your purifier

If your machine is dusty, wipe it with a damp, lint-free cloth.

Troubleshooting image

Check the sensor

Check the sensor inlets on the left hand side of the conic amplifier for dust and debris.

Troubleshooting image

Check for dust

Look for dust and debris in the outer cover and in the conic amplifier.

Brush

Use a soft brush to remove the dust and debris.

Troubleshooting image

Don't use detergents

Don't use detergents or polishes to clean your machine.

Has this resolved the problem?

Increase the airflow speed

Press the power button to increase the airflow speed to Airflow speed 2.

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Open a window

If you find that your purifier is always reporting a high level of CO₂ and never medium or low, opening a door or window may help to lower the level.

Has this resolved the problem?

We need a little more information to help us solve your issue.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen. Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

We need a little more information to help us solve your issue.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen. Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

We need a little more information to help us solve your issue.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen. Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

We need a little more information to help us solve your issue.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen. Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

We need a little more information to help us solve your issue.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen. Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

Looking after your purifier

To always get the best performance from your Dyson air purifier, it's important to regularly clean it and check for blockages.

Cleaning your purifier

If your machine is dusty, wipe it with a damp, lint-free cloth.

Troubleshooting image

Check the sensor

Check the sensor inlets on the left hand side of the conic amplifier for dust and debris.

Troubleshooting image

Check for dust

Look for dust and debris in the outer cover and in the conic amplifier.

Brush

Use a soft brush to remove the dust and debris.

Troubleshooting image

Don't use detergents

Don't use detergents or polishes to clean your machine.

Has this resolved the problem?

Check the electrics

Check that the household electrics are on.

Check the plug and power cord for signs of damage.

Try the machine in a different plug socket.

Troubleshooting image

Has this resolved the problem?

Do not attempt to use the machine until the power cord has been replaced.

We need a little more information to help us solve your issue.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen. Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

Check the electrics

Check that the household electrics are on.

Check the plug and power cord for signs of damage.

Try the machine in a different plug socket.

Troubleshooting image

Has this resolved the problem?

Press the power button

Press and hold the power button to switch off your machine.

Has this resolved the problem?

Unplug the machine

Remove the plug from the socket and plug it in again.

Press the power button

Press the power button on the screen to switch on your machine.

Switch off the machine

Press and hold the power button to switch off your machine.

Has this resolved the problem?

Replacement parts

Main body

Choose the part you'd like to replace.

  • Conic amplifier
  • Outer cover
  • Carbon filter
  • HEPA filter
  • Main body
  • Castor wheel

Please check if your machine is under guarantee or purchase replacement parts below - your part will then be delivered to you. Your machine comes with complimentary parts when covered under your guarantee policy. To check if yours is still under guarantee, visit MyDyson

Apologies. We can’t help you online.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen.

Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

Unplug the machine

Press and hold the power button to turn off the machine. Unplug the machine.

Troubleshooting image

Remove the conic amplifier

Slide the release button on the back of the conic amplifier into the unlock position. Lift the conic amplifier off the machine.

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Lift the conic amplifier out of the box and place it on the top of your machine.

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Rotate the conic amplifier until it clicks securely into place.

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Plug in and press the power button.

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Were you able to fit your part?

We need a little more information to help us solve your issue.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen. Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

Please check if your machine is under guarantee or purchase replacement parts below - your part will then be delivered to you. Your machine comes with complimentary parts when covered under your guarantee policy. To check if yours is still under guarantee, visit MyDyson

Apologies. We can’t help you online.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen.

Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

Unplug the machine

Press and hold the power button to turn off the machine. Unplug the machine.

Troubleshooting image

Remove the conic amplifier

Slide the release button on the back of the conic amplifier into the unlock position. Lift the conic amplifier off the machine.

Troubleshooting image

Remove the outer cover

Lift the outer cover off the base of the machine.

Remove the carbon filter

The carbon filter is wrapped around the central body of the machine. Pull each of the four clips towards you to release the filter.

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Replace the main body

Remove your replacement main body from any packaging. Place the carbon filter on the base of the machine.

Attach the carbon filter

Wrap the carbon filter around the central body of your machine, fit the clips into position and push each one to secure the filter.

Troubleshooting image

Refit the outer cover

Place the outer cover back in position on the base of your machine.

Refit the conic amplifier

Place the conic amplifier on your machine and rotate it until it clicks securely into position.

Switch on the machine

Plug in and press the power button.

Troubleshooting image

Were you able to fit your part

Apologies. We can’t help you online.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen.

Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

Unplug the machine

Press and hold the power button to turn off the machine. Unplug the machine.

Troubleshooting image

Remove the conic amplifier

Slide the release button on the back of the conic amplifier into the unlock position. Lift the conic amplifier off the machine.

Troubleshooting image

Remove the outer cover

Lift the outer cover off the base of the machine.

Remove the filter

The carbon filter is wrapped around the central body of the machine. Pull each of the four clips towards you to release the filter. Dispose of the filter in accordance with local regulations.

Troubleshooting image

Install a new filter

Remove your replacement filter from any packaging. Place the filter on the base of the machine.

Wrap it around the main body

Wrap the filter around the central body of your machine, fit the clips into position and push each one to secure the filter.

Troubleshooting image

Refit the outer cover

Place the outer cover back in position on the base of your machine.

Refit the conic amplifier

Place the conic amplifier on your machine and rotate it until it clicks securely into position.

Switch on the machine

Plug in and press the power button.

Troubleshooting image

Were you able to fit your part?

Apologies. We can’t help you online.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen.

Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

Unplug the machine

Press and hold the power button to turn off the machine. Unplug the machine.

Troubleshooting image

Remove the conic amplifier

Slide the release button on the back of the conic amplifier into the unlock position. Lift the conic amplifier off the machine.

Troubleshooting image

Remove the outer cover

Lift the outer cover off the base of the machine.

Remove the filter

The HEPA filter is located within the outer cover. Press the filter release buttons located on the inner rim and lift the outer cover off the filter. Dispose of the filter in accordance with local regulations.

Troubleshooting image

Install a new filter

Remove your replacement filter from any packaging. Place the filter on the base of the machine.

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Refit the outer cover

Place the outer cover over the filter and press down until it clicks securely into position.

Refit the conic amplifier

Place the conic amplifier on your machine and rotate it until it clicks securely into position.

Switch on the machine

Plug in and press the power button.

Troubleshooting image

Were you able to fit your part?

Please check if your machine is under guarantee or purchase replacement parts below - your part will then be delivered to you. Your machine comes with complimentary parts when covered under your guarantee policy. To check if yours is still under guarantee, visit MyDyson

Apologies. We can’t help you online.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen.

Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

Unplug the machine

Press and hold the power button to turn off the machine. Unplug the machine.

Troubleshooting image

Remove the conic amplifier

Slide the release button on the back of the conic amplifier into the unlock position. Lift the conic amplifier off the machine.

Troubleshooting image

Remove the outer cover

Lift the outer cover off the base of the machine.

Separate the HEPA filter from the outer cover

The HEPA filter is located within the outer cover. Press the filter release buttons located on the inner rim and lift the outer cover off the filter.

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Reassemble the machine

Place the filter on the base of the machine. Place the outer cover over the filter and press down until it clicks securely into position.

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Refit the conic amplifier

Place the conic amplifier on your machine and rotate it until it clicks securely into position.

Switch on the machine

Plug in and press the power button.

Troubleshooting image

Were you able to fit your part?

Please check if your machine is under guarantee or purchase replacement parts below - your part will then be delivered to you. Your machine comes with complimentary parts when covered under your guarantee policy. To check if yours is still under guarantee, visit MyDyson

Apologies. We can’t help you online.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen.

Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

How to remove a wheel

To remove a wheel, gently lever it from the castor.

The new wheel can be pressed straight into the existing castor so that it clicks into place.

How to replace the castor

If the castor needs to be replaced, it can be removed with a Pozidriv screwdriver.

The castor is held in place by a single screw. Remove the wheel to reveal the screw.

Were you able to fit your part?

Serial number location

The serial number can be found on the base of the machine.

Troubleshooting image

Please select the next step

Please select the appropriate option

Do not plug in or attempt to use the machine in this condition.

We need a little more information to help us solve your issue.

Please contact our Customer Support Team by calling 1-866-314-8881 or by clicking the Live Chat button in the bottom right corner of your screen. Dyson Supersonicᵀᴹ hair dryer Professional edition owners should call 1-866-861-2565.

Quick start guide

Please follow the steps in the video.

Find the text version of the step-by-step guide instead, under "Is there anything else we can help you with?"

Owner support online

Find this video and more on the Getting started page

Is there anything else we can help you with?

Assembling your machine

Use both hands to lift your machine out of the box, by its base.

Your machine comes with a HEPA filter, carbon filter and permanent catalytic filter. These are already installed in your machine.

Lift the conic amplifier out of the box and place it on the top of your machine.

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Rotate the conic amplifier until it clicks securely into place.

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Plug in and press the power button.

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Is there anything else we can help you with?

We're glad the problem's been solved.

Please let us know if there's anything else we can help you with.

Please open the PDF for the user guide.

Is there anything else we can help you with?

Switching on your machine

Press the power button on the screen to switch on your machine.

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Airflow speed 1

Press the power button again for Airflow speed 1.

Airflow speed 2

Press the power button a second time for Airflow speed 2.

Cycling through the settings

Keep pressing the power button to cycle through idle (Airflow speed 0), Airflow speed 1 and Airflow speed 2.

Switching off your machine

Press and hold the power button to switch off your machine.

Is there anything else we can help you with?

Real-time reporting

The LCD screen displays the power mode setting and the CO₂ level in the room - reporting it in real-time.

Low CO₂

CO₂ is at a safe level.

Troubleshooting image

Medium CO₂

CO₂ is building up. It may be advisable to take preventative measures.

Troubleshooting image

High CO₂

CO₂ has built up to a level of concern. It's advisable to take action like opening a door or a window.

Troubleshooting image

Is there anything else we can help you with?

Where to position your purifier

Your machine is fitted with wheels to make it easier to move.

Position your machine on a level floor.

When placing the machine, ensure there are at least a few feet of clearance on all sides so that the air can circulate effectively. Place away from air vents and windows.

For the most effective purification, position your machine on the edge of the room with the conic amplifier pointing to the furthest point, along the wall.

Troubleshooting image

You can also position your machine facing diagonally across the room.

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Is there anything else we can help you with?

Serial number location

The serial number can be found on the base of the machine.

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Is there anything else we can help you with?

Changing the carbon filter

Please follow the steps in the video.

Find the text version of the step-by-step guide instead, under "Is there anything else we can help you with?"

Unplug the machine

Press and hold the power button to turn off the machine. Unplug the machine.

Troubleshooting image

Remove the conic amplifier

Slide the release button on the back of the conic amplifier into the unlock position. Lift the conic amplifier off the machine.

Troubleshooting image

Remove the outer cover

Lift the outer cover off the base of the machine.

Remove the filter

The carbon filter is wrapped around the central body of the machine. Pull each of the four clips towards you to release the filter. Dispose of the filter in accordance with local regulations.

Troubleshooting image

Install a new filter

Remove your replacement filter from any packaging. Place the filter on the base of the machine.

Wrap it around the main body

Wrap the filter around the central body of your machine, fit the clips into position and push each one to secure the filter.

Troubleshooting image

Refit the outer cover

Place the outer cover back in position on the base of your machine.

Refit the conic amplifier

Place the conic amplifier on your machine and rotate it until it clicks securely into position.

Switch on the machine

Plug in and press the power button.

Troubleshooting image

Is there anything else we can help you with?

Changing the HEPA filter

Please follow the steps in the video.

Find the text version of the step-by-step guide instead, under "Is there anything else we can help you with?"

Unplug the machine

Press and hold the power button to turn off the machine. Unplug the machine.

Troubleshooting image

Remove the conic amplifier

Slide the release button on the back of the conic amplifier into the unlock position. Lift the conic amplifier off the machine.

Troubleshooting image

Remove the outer cover

Lift the outer cover off the base of the machine.

Remove the filter

The HEPA filter is located within the outer cover. Press the filter release buttons located on the inner rim and lift the outer cover off the filter. Dispose of the filter in accordance with local regulations.

Troubleshooting image

Install a new filter

Remove your replacement filter from any packaging. Place the filter on the base of the machine.

Troubleshooting image

Refit the outer cover

Place the outer cover over the filter and press down until it clicks securely into position.

Refit the conic amplifier

Place the conic amplifier on your machine and rotate it until it clicks securely into position.

Switch on the machine

Plug in and press the power button.

Troubleshooting image

Is there anything else we can help you with?

Unplug the machine

Press and hold the power button to turn off the machine. Unplug the machine.

Troubleshooting image

Remove the conic amplifier

Slide the release button on the back of the conic amplifier into the unlock position. Lift the conic amplifier off the machine.

Troubleshooting image

Remove the outer cover

Lift the outer cover off the base of the machine.

Lay the main body of the machine on its side to access the castor wheels.

How to remove a wheel

To remove a wheel, gently lever it from the castor.

The new wheel can be pressed straight into the existing castor so that it clicks into place.

How to replace the castor

If the castor needs to be replaced, it can be removed with a Pozidriv screwdriver.

The castor is held in place by a single screw. Remove the wheel to reveal the screw.

Is there anything else we can help you with?

Unplug the machine

Press and hold the power button to turn off the machine. Unplug the machine.

Troubleshooting image

Remove the conic amplifier

Slide the release button on the back of the conic amplifier into the unlock position. Lift the conic amplifier off the machine.

Troubleshooting image

Remove the outer cover

Lift the outer cover off the base of the machine.

Lay the main body of the machine on its side to access the castor wheels.

How to remove a wheel

To remove a wheel, gently lever it from the castor.

With the wheel removed, clear away any dirt or debris from both the wheel and castor.

​Once cleared, press the wheel back into the castor until it clicks into place.

Is there anything else we can help you with?