Dyson Purifier (first generation) F indicator - Any suggestions? | Dyson Community
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After I changed the filter with a Dyson filter, the F indicator did not go away.

 

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Hi.

I am unsure which model you own. Google search results for this indicate:

An "F" on your Dyson Purifier after changing the filter on your 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.