Hi there Jacqueline, it's Jack at Dyson.
If your Dyson cordless vacuum is pulsing on and off with the filter in place, the filter may need a wash. I'd also strongly recommend checking the bin inlet, wand and motorised floor tool for any blockages, following the steps shown in our video guide:
When you check the bin inlet, make sure the bin inlet flap is able to open and close freely, and that no debris is jamming it in place.
I'm confident this will resolve the issue. If you'd like further assistance from our experts after giving this a try, please call the Dyson Customer Helpline on 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU). We'll be able to talk you through some simple diagnostic checks when you have your machine fully charged and easily to hand.
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