What to do if you receive an error that your code is already claimed in your account.

Troubleshooting for game crashes with error "The application encountered an unexpected error"

If you receive errors when loading your hero, try the following steps to solve the problem

Troubleshooting for error 1016 in Diablo III

Information about the error "There was a problem retrieving items from the store. (Code 396009)."

What to do if you can't save your communication preferences in the Account Management page.

Troubleshooting steps for crash problems

Information regarding steps you can take if your email address is already in use on an account.

Information about this error when redeeming a code on your Battle.net account

How to troubleshoot connection issues between Battle.net and Steam