Hello @Alison Gaskins
Thanks for reaching out. It's always nice to see our members engaging. I thought I'd just step in and add to the information given.
When continuous monitoring is active, and when the machine is in a standby state, users may hear a low humming sound. This is caused by the onboard sensors.
I have added the following link for further information and guidelines on this here
If you’ve not yet connected your machine to the Dyson App, please refer to our Connecting your Purifiers, Humidifiers and Heaters to the App article.
If the steps above do not resolve the matter, please get in touch via our WhatsApp channel and one of our teams will be happy to discuss the next steps. To do this, simply click on our Guides and manuals link, navigate to the ‘Contact us’ section of the page and select ‘Start a WhatsApp conversation’.
Happily, these links will help you.
Regards,