From the KY Landlord Tenant Guide
Right to Terminate Lease. If the tenant refuses to comply with the provisions of the lease or the Landlord/Tenant Act, the landlord is entitled to give the tenant written notice specifying the violation and stating that the lease will terminate after fourteen days unless the offense is resolved. The tenant must be given a chance to rectify the situation and prevent termination of the lease. If the tenant makes the necessary repairs or pays damages within the allowed time, the lease shall not be terminated. If the violation reoccurs within six months, the landlord has the same recourse; however, in this case, the landlord is not required to give the tenant a second chance to undo the damages and may terminate the lease upon fourteen days' written notice.
In the special case when rent is overdue, the landlord must give the tenant written notice granting him only seven, and not fourteen, days in which to pay. If the rent is still unpaid after the seven days, the landlord may terminate the lease at this time (KRS 383.660).
The landlord's right to terminate the lease (when the tenant is in violation of any of the lease's provisions), is lost whenever the landlord accepts a rent payment with full knowledge of the tenant's violation. For example, the tenant may, in violation of a "no pet" clause, have a cat on the property. Once the landlord collects the rent with full knowledge of the cat's presence he may never terminate the lease claiming that the "no pet" clause has been violated (KRS 383.675).
In some situations, the landlord may prefer not to terminate the lease when a tenant refuses to remedy a situation in which the tenant's action has put the health and safety of others in jeopardy. If the tenant has failed to have the damage properly repaired, the landlord is entitled to hire someone to repair any damage at the tenant's expense fourteen days after the landlord has given the tenant written notice describing the problem. The landlord must give the tenant an itemized bill for the cost of the repair, and may collect the amount due with the next rental payment (KRS 383.665).