Dyson Cool not running after 60 seconds - Help! | Dyson Community
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Cool purifying fan , first generation, shuts down after 60 seconds.  reset does not solve the problem.  screen shows symbol for wireless with a blurry green A below and on the left side of the screen.

If there’s no help from their reset instructions, it could be a faulty power cable. If its one that plugs in the back, like a charger, you can order it from Dyson. The wired ones will need an engineer. Your best placed to give them a call to diagnose it. 

Resource:

'Power Cycling/Restarting/Resetting' the air treatment machine | Dyson Community

Visit Dyson.com for the contact details.