If the IRS had difficulty sending your direct deposit they will mail the check on the date posted in "where's my refund". This can happen even if your account information is correct in TurboTax.
Also, you may want to review previously-entered bank account info to double-check the account information and how you requested the refund to be sent, simply revisit the File section in TurboTax and step through
the screens (it's on the How Do You
Want Your Federal Refund? screen in the File section).
This
will show your routing and account number, or if you selected to have a paper
check mailed to you.
Here
is more information:
https://ttlc.intuit.com/replies/4083015
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