Ohio Rev. Code § 5313.05: Default of vendee.

When the vendee of a land installment contract defaults in payment, forfeiture of the interest of the vendee under the contract may be enforced only after the expiration of thirty days from the date of the default. A vendee in default may, prior to the expiration of the thirty-day period, avoid the forfeiture of his interest under the contract by making all payments currently due under the contract and by paying any fees or charges for which he is liable under the contract. If such payments are made within the thirty-day period, forfeiture of the interest of the vendee shall not be enforced.