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Why is my vacuum cleaner whistling?

by Vax Expert

What does it mean if your vacuum cleaner starts to make a whistling noise and what can you do to stop it? Our Vax Expert is back with some suggestions how you can make your vacuum cleaner sound healthy and happy once more…

Vax Expert says:

If your machine starts to whistle it’s unlikely that it’s because it’s happy in fact, it’s probably very unhappy! The usual reasons for this happening are either that the air-bleed valve has activated or a seal is leaking or missing. There are so many different machine designs that it is impossible to cover all the possible reasons why this whistling has started, however I am going to provide a broad explanation and some possible fixes.

First we need to find out where the whistling is coming from. To do this, check the machine as follows:

1. Remove the hose from the machine. Did the whistling stop? If it did, then replace the hose again ensuring it is attached securely. Does the whistling return? If it does, then see if you can identify where the noise is coming from.  If the noise is coming from the point where the hose connects to the machine then it is possible that the seal is defective, contact the machine’s manufacturer to see what can be done.

2. Remove the dirt bin from the machine. Did the whistling stop? If it did, then you need to clean the filters. You should always refer to your user guide for how to do this. If you have a Vax machine you can find yours online here. You should also check that the seals on the dirt bin and the connections points on the machine are intact.

3. Is the noise coming from a small hole on the machine or dirt bin? Then it’s more than likely that the air-bleed valve has activated.

Air-bleed valve

The  air-bleed valve is spring loaded and will open when the air pressure is increased, such as when there is a blockage in the machine, caused by blocked, dirty filters or a blockage in the hose.

When the suction on the machine is reduced like this you will notice the machine’s motor will become louder. This is because it is working harder to try and keep the suction high. This may be good for cleaning but it is not good for the motor and as a result the bleed valve will activate. Ultimately, the machine will overheat and then cut-out.

The valve should not be touched, instead the reason for its activation should be found.

If following the above does not sort out the whistling then the best route to follow is to contact your vacuum cleaner’s manufacturer and they can guide you through the options available to you.

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