Roku error code 003 is mostly associated with Software related issues. So, if you have not updated the latest software of the Roku device then it is most likely to show this error on your screen.
While many times you may also come across this error if there is a network-related issue.
There is you think these two are the reason for the Roku error 003 then make sure to update the software to the latest version. Are you thinking of how to fix Roku error code 003?
So, here are the steps that you need to follow to update the software of the Roku device.