How do I reset the filter indicator after replacing the filter unit?
Press and hold the 'Standby ON/OFF' button on the remote control for 6 seconds after reassembling the machine to reset the filter indicator. A clockwise-rotating loading pattern will appear on the LED display, and once complete, the machine will return to normal usage. (Page 7)
From the official Dyson Pure Cool AM11 Air Purifier manual, page 7
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