What should I do if the screen displays 'CHECK ATOMIZER'?
The 'CHECK ATOMIZER' error appears when there is no load or high resistance detected in the pod, and the device will stop working. This indicates a problem with the pod connection or compatibility—ensure the pod is properly installed and check that the connection pins are clean. (Page 6)
From the official Vaporesso Xros 4 Nano Pod Kit manual, page 6
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