Only the IRS can provide that information. If there was an error in your routing or bank account number or the bank rejected the deposit, then that would cause the IRS to mail your refund check. Please see the below TurboTax Help Article for information on contacting the IRS:
How do I contact the Internal Revenue Service (IRS)?
Once they have it set for a check, there is no way to change the method they are sending.
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