Roku error code 003 appears when you try to update the software on your Roku device. It is directly related to the software update process and usually occurs when there is a specific connection issue between your Roku device and Roku's servers.
3 Ways to Fix Roku Error Code 003 | Unable to Update Software
There are several possible causes for Roku error code 003, all of which have to do with a connection issue.
Each of these issues can be caused by different components, whether it's your router, Roku's settings, or Roku's servers. The best way to troubleshoot this issue is to investigate each possible cause.
The following troubleshooting tips start with the most basic solutions to fix Roku error code 003 and then work your way up to the more complex issues.
