Ohio Rev. Code Ann. § 1335.02
(A) As used in this section:
(2) "Financial institution" means a ny of the following:
(B) No party to a loan agreement may bring an action on a loan agreement unless the agreement is in writing and is signed by the party against whom the action is brought or by the authorized representative of the party against whom the action is brought. However, a loan agreement need not be signed by an officer or other authorized representative of a financial institution, if the loan agreement is in the form of a promissory note or other document or commitment that describes the credit or loan and the loan agreement, by its terms, satisfies all of the following conditions:
(D) This section does not apply to any loan agreement in which the proceeds of the loan agreement are used by the debtor primarily for personal, household, or family purposes and either of the following applies: