my ninja air fryer af101 just beeped and says END on the screen but the food isn't done, what's wrong?

The END display is a timer notification, not a cooking completion sensor. The food likely needs more time.

1. Press the START/PAUSE button to resume cooking.
2. Use the TIME up and down arrows to add more cook time.
3. Press START/PAUSE again to continue.

If that didn't work: The unit may have entered standby mode after 10 minutes of no input, shutting off the heating element. Press the Power button to turn the unit back on, reselect your function and temperature, set a new time, and press START/PAUSE.

Heads up: Always use a food thermometer to check internal temperatures. The beep and END display only mean the timer you set has finished.