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What does F mean on Dyson purifier?

Flashing "F" on your Dyson Purifier after changing the filter on your TP01 Pure Cool? Don't worry, and this just means you need to reset the filter indicator light. Here's how: make sure your cleaner or purifier is turned ON, then press and hold the "Standby ON/OFF" button for 6 seconds using the remote control.
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