Your problem may have been caused by a recent update to your router which affects some Roku models. If you received this update it changed the router's wifi connection parameters from b/g/n to g/n. This has been reported lately with equipment from Comcast/Xfinity and Cox, but there may be others.
Affected users report the Roku identifies the local network as available and rates the connection quality, but will not then connect. The fix is to switch the router configuration protocols from the g/n wifi that was set by the update back to b/g/n. If you don't have access to your router's configuration controls you may have to have your internet provider do it for you.
Step-by-step post from @AvsGunnar for Comcast/Xfinity users:
https://community.roku.com/t5/Network-Wireless-Wired-Connections/Error-014-30-stuck-for-three-days/m...
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
