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I was alerted on my Dyson phone app.
Sorry, there was a problem. Please try again later.Hi there, this is Tia from Dyson! Great question! The HP04 purifying fan will alert you when it's time to change the filter. When the filter is full, the display will flash the filter symbol to remind you which filter needs changing. You may also see this information by tapping on the the filter replacement indicator within "settings" on the Dyson Link app. Thanks for your support of Dyson technology! Best wishes, Tia Dyson Customer Support
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