The error code 2002-3005 is received when powering up the Nintendo Switch console, or when coming out of sleep mode.
What to Do:
Restart the console by holding down the POWER Button for three seconds, then select "Power Options" > "Restart."
If Nintendo Switch is not responding, hold down the POWER Button for twelve seconds to force the console to shut down, then power it back it on.
Is the error still being displayed?
Continue using the console and monitor the situation.
Is a microSD Card inserted in the console?
Power off the Nintendo Switch console and remove the microSD card.
Power on the console again and download the software directly to the system memory.
If, after completing the above, the Error Code does not appear continue using the console and monitor the situation.
Situation Not Resolved
If you would like further assistance with the Nintendo Switch console, please contact Nintendo Customer Service.