Why is my Dyson going on an off when I'm holding the on button?

"Machine is pulsating

There's  a troubleshooting guide for a ""pulsating"" machine: https://www.dyson.co.uk/support/journey/...

""The machine is designed to pulsate. This is an audible feature that indicates a restriction of airflow and prevents damage to the motor. This is usually caused by a blockage within the machine or a clogged filter.When the machine is pulsating, it will switch on and off in quick succession. Make sure the machine is cool before running through the following checks.""

Here are the recommend steps to sort out the problem:

1. Open the bin

Press the bin base release button to empty bin and leave the bin base open.

(if that doesn't solve the problem proceed to step 2)

2. Check for any obstruction of :

cleaner headwandbin inlet & flap

(if that doesn't solve the problem proceed to step 3 - but you better do the next steps outside in the garden ... )

3. Remove the bin

“Using the Combination tool, brush away any dust around the shroud of the cyclone.Once cleared of any dust, press and hold the trigger for 10 seconds.”

(if that doesn't solve the problem proceed to step 4 -  this really better outside in the garden ...!!! )

4. Remove the pre-filter

“Pull the pre-filter out of the top of the cyclone and place the palm of your hand over the hole where the filter is usually positioned.Press and hold the trigger for 10 seconds” (better with Max.Power!)Take care: there might be clouds of fine ‘moon-dust’ blown out of the machine ...

If that doesn't help, Dyson recommends to contact support …

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The motorhead does not rotate or only works irregularly?

Check ***Dyson v6 Absolute Main Body Replacement***There are two little metal tabs sitting above the lever of the bin and are meant to make electrical contact to the wires running around the bin and down the wand to the motorhead to power the rotating brush.Those metal-tabs tend to get bend and/or their ends might have become dislocated out of their brackets.Best to follow the steps of removing the Main Body from the Cyclone to get them metal-tabs back in place."