Dyson Pure Cool Noisy When Off – Why And What To Do?

A Dyson Pure Cool purifying fan can have operational difficulties like any appliance. For instance, it isn't quiet even when you've turned it off. If you have a Dyson Pure Cool air purifier and want to know why this happens, stay on this page as we have researched the answer. Here is what the experts say.

A Dyson Pure Cool purifying fan has a continuous monitoring option that always runs. Because of this, the purifying fan continues working to maintain airflow even when it is switched off and creates a low humming noise.

You can turn off the continuous monitoring option by selecting Manual mode through the remote control or the Dyson Link application on your mobile phone.

The Dyson Pure Cool purifying fan aims to maintain quality air in your room. Hence the continuous monitoring option.

Read further to know more about the continuous monitoring option and basic troubleshooting for other strange noises you may encounter with your Dyson Pure Cool.

black color bladeless purifying tower fan is on the floor of the living room to create fresh air ambient in the summer - Dyson Pure Cool Noisy When Off - Why And What To Do?

The Continuous Monitoring Option On Dyson Pure Cool

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The Continuous Monitoring Option on Dyson Pure Cool purifying fan is a feature that enables the fan to gather data even when the unit is turned off. The data include air quality, temperature, and humidity.

The purifier's sensors have small fans which maintain airflow for continuous monitoring. The information gathered will then be displayed on the unit's LCD screen and the Dyson Link application.

Through this option, you can monitor the current air quality and temperature inside your room even when the purifier is off. 

How To Turn The Continuous Monitoring Option Off

There are two ways to turn off the continuous monitoring option.

Select Manual Mode

The Continuous Monitoring Option runs only when the purifier is in Auto mode. To turn off the option, locate the Auto button on the remote control and press it for five seconds. This should enable the Manual mode.

Click here to see this Dyson Pure Cool remote control replacement on Amazon.

Access The Dyson Link Application

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Open the Dyson Link application on your mobile phone and go to the settings. Look for the "Collect Data When In Standby" option and turn it off. The icon should turn gray. Click "Done" to save the changes.

Other Noises In A Dyson Pure Cool

Other Noises In A Dyson Pure Cool - London, UK - Circa January 2022 Shallow focus of the OLED display of an air purifier showing the Air Quality Level

You may hear certain noises from your Dyson Pure Cool air purifier. Some of these noises are normal, and others may indicate problems that may worsen if left unchecked.

You may encounter the following sounds while the fan is running. Some cases can be resolved with simple troubleshooting. However, when the noise persists, it is best to contact Dyson customer service for further help.

High-Pitched Noise Related To Continuous Monitoring Option

When the Continuous Monitoring Option is on, there are instances when the air quality indicator light shows green, but the fan still creates a high-pitched noise. This indicates that the fan is working hard to maintain good air quality. 

This could be due to airflow leaks such as open windows or doors where dirty air gets inside constantly. When the purifier is in "Auto" mode, it can self-adjust to accommodate changes in the air condition.

If you wish to reduce the noise, close the windows and doors so the fan stabilizes, and make sure to address other airflow leaks. You can also change the airflow direction to face backward or set the fan to "Manual" mode while lowering the airspeed. 

Constant Humming

A constant humming noise is normal. This noise is created every time the thermostat works to maintain the required temperature setting.

Whining Or Whistling Noise

A whining or whistling noise is created when the purifying fan's loop amplifier is not installed correctly. To stop the noise, remove and refit the loop amplifier properly. Make sure there is no gap between the loop and the main body of the fan. 

If the noise persists, contact Dyson customer service. This may indicate a more serious problem inside the fan.

Clicking Noise

A clicking sound is created as the fan's motor adjusts direction when the purifier switches its airflow from front to rear. This is normal and is not an indicator of anything wrong with the fan.

However, when the noise occurs when the fan is oscillating, this may indicate obstruction at the base of the fan. Check the base and remove any debris that could block the oscillation.

Buzzing Noise

A buzzing noise is common. This is caused by the particulates accumulated in the filter or the intake holes. When this happens, the fan's motor struggles to work, making the buzzing noise.

Make sure to clean the filter regularly and replace the filter if necessary. If yours doesn't have a filter, clean the inside of the fan.

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How To Clean The Filter Of A Dyson Pure Cool?

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Cleaning the filter regularly prevents unnecessary noises caused by dust and other dirt blocked by the filter. It is also integral for the fan's peak performance. To clean the filter, follow these steps:

  1. Unplug the fan from the power outlet.
  2. Remove the filter from the main body of the purifier.
  3. Rinse the filter under cold running water. Do not use any cleaning agent. Gently squeeze the filter until the water runs clear.
  4. Give the filter at least 24 hours to dry completely. Do not use any drying appliance or hot surfaces. Instead, leave the filter in a warm area and let it dry naturally.
  5. When the filter is completely dry, place it back in the purifier properly.

How To Replace The Filter Of A Dyson Pure Cool?

The Dyson Pure Cool air purifier has a layer of filters that block different harmful organisms present in the air. When the non-washable carbon filter needs replacing, an empty bar will be indicated on the LCD screen.

To replace the carbon filter, do the following steps:

  1. Unplug the appliance from the power source.
  2. Slide down the buttons located on either of the shrouds. This should remove the shrouds together with the glass HEPA filters.
  3. Press the tabs on both sides of the filter to remove the carbon filters. Dispose of the carbon filters properly.
  4. Install the new carbon filter.
  5. Place back the shrouds. Push until you hear a click.
  6. Plug the appliance back into the power outlet.
  7. Switch the appliance on. Then, press and hold the oscillation button on the remote control. This should reset the carbon filter level. Once the default screen is displayed, the purifier is ready to use.

Click here to see this Dyson Pure Cool carbon filter replacement on Amazon.

Why Is A Dyson Pure Cool Too Loud?

The intensity of noise created by the purifying fan depends on your airspeed level. The higher the airspeed, the louder the fan is going to be.

Technically, levels 1- 4 create silent humming. However, the sound becomes more audible when you reach level 5.

You can set your Dyson Pure Cool to a lower fan speed at night to keep the room quiet while you sleep. The night mode can also do this for you automatically.

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What Is Night Mode In A Dyson Pure Cool?

The night mode is a feature that adjusts the fan to the desired setting at night to give you a better sleeping experience. You can customize the night mode setting using the Dyson link application. 

If the purifier is set to Auto mode, the fan dims the display screen and sets the fan's airspeed to levels 1-4, reducing the noise it creates. 

In manual mode, if the current airspeed is at level 5 or higher, activating the night mode will set the airspeed to level 4. Furthermore, if the current airspeed is below level 4, the purifier will stay on that level unless changed.

PENANG, MALAYSIA - 25 APR 2019 Dyson Pure Cool Purifying Tower Fan on store shelf.

In Closing

Noises can occur in your Dyson Pure Cool air purifier as the fan works hard to maintain quality air. Some of these noises are normal, and others may indicate serious problems with your fan.

The humming noise you hear, particularly when you turn the fan off, is most likely because of the continuous monitoring option. The sound is normal and is not something to worry about.

For more tips about operating a Dyson Pure Cool air purifier, visit the following posts.

How To Control A Dyson Fan Without A Remote

Dyson Fan Not Rotating- What To Do?

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