Ohio Rev. Code Ann. § 1312.05
(A) A residential contractor shall provide the owner with a good faith written response to any notice provided pursuant to section 1312.04 of the Revised Code. The response shall be provided within twenty-one days after the owner mailed the notice, delivered it by personal delivery, or transmitted it by telegram, facsimile, or electronic mail. In the response, the contractor shall offer to take one of the following actions:
(C)