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What does F mean on Dyson purifier?

You may see a flashing "F" on your Dyson Purifier after changing the filter on your TP01 Pure Cool. It won't go away after changing the filter until you also reset the filter indicator light. To do this, make sure your purifier is on, and then proceed to press and hold the 'standby ON/OFF' button for 6 seconds on the remote.

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