As you use your Nano, you'll see different colored lights on the LED indicator towards the middle of the unit. Here's what each one means:
SOLID WHITE
Your Nano is currently idle (it's plugged in, but not running).
PULSING BLUE
Your Nano is warming up to the desired temperature you've selected.
SOLID BLUE
Your Nano has reached the desired temperature you've selected.
FLASHING RED
Your Nano has experienced an error (see here for more information).
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