Error 103 occurs because the banking credentials in QuickBooks Online are wrong. If you changed the sign-info recently you can refer to the steps below to fix QuickBooks Banking Error 103: • Step 1: Open QuickBooks Online and select ‘Banking.’ • Step 2: Search for the account that generated the banking error. • Step 3: Click on the edit icon and go to the ‘Edit sign-in info’ option. • Step 4: Enter the new bank credentials and then press ‘Update.’ If you find that the error persists even after your update the sign-in info you can call the Quickbooks toll free number and ask for assistance. Professional tech support experts will give you advanced solutions to help you fix Error 103 as soon as possible.