Ohio Rev. Code § 124.49
All promotional appointments in a fire department may be for a probationary period to be fixed by the rules of the civil service commission and not to exceed six months. No promotion shall be deemed final until the appointee has satisfactorily served his probationary period. At the end of the probationary period the appointing authority shall transmit to the civil service commission a record of the employee's service, and if such service is satisfactory the appointee shall continue in his promoted rank. If at the end of the probationary period the appointee's service is unsatisfactory, he shall be reduced to the rank held at the time he was appointed to the higher rank. In all cases of unsatisfactory probationary periods in the fire department, the appointing authority shall, at the end of the probationary period, furnish the employee with a written notice of unsatisfactory probation and a detailed statement of the basis for such finding. Within ten days thereafter such employee may appeal from the decision or order of the appointing authority to the municipal or civil service township civil service commission, and the commission shall hear, or appoint a trial board to hear, such employee's appeal within thirty days from its filing with the commission. An appeal to determine the sufficiency of the cause of demotion may be had from the decision of the commission to the court of common pleas of the county in which the municipality or township is situated. The appeal shall be taken within twenty days from the decision of the commission.
R.C. §124.49