Ohio Rev. Code § 3123.032: Notice becomes final determination if no request for hearing.

(A) If an obligor who has received a default notice under section 3123.03 of the Revised Code fails to make a timely request for an administrative hearing under section 3123.04 of the Revised Code, the default notice becomes a final and enforceable determination by the child support enforcement agency that identified the default of both of the following:

(1) The obligor is in default under the support order.

(2) The amount of the arrearage owed as a result of the default.

(B) If an agency's determination becomes final and enforceable under this section, the agency shall take further action as required under section 3123.06 of the Revised Code.