dyson ball animal 2 sounds like an air raid siren on switch on and switch off. . when running there is no such noise and works correctly | Dyson Community
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As per title

Hi ​@Walace58 ,

Welcome to the Dyson Community, and thanks for letting us know about this.

This sounds like an unusual issue, and it’s not something we can troubleshoot via the Dyson Community forum.

To help pinpoint the cause, our Customer Care experts will need to guide you through additional troubleshooting checks when you have your Dyson vacuum available. They will then discuss repair or replacement options if necessary.

Visit Dyson.com and click "Support" to reach the right Customer Care team for your region.

We look forward to speaking with you!