N.C. Gen. Stat. § 87-23

(1) The Board shall have power to revoke or suspend the license of or order the reprimand or probation of any plumbing, heating, or fire sprinkler contractor, or any combination thereof, who is guilty of any fraud or deceit in obtaining or renewing a license, or who fails to comply with any provision or requirement of this Article, or the rules adopted by the Board, or for gross negligence, incompetency, or misconduct, in the practice of or in carrying on the business of a plumbing, heating, or fire sprinkler contractor, or any combination thereof, as defined in this Article. Any person may prefer charges of such fraud, deceit, gross negligence, incompetency, misconduct, or failure to comply with any provision or requirement of this Article, or the rules of the Board, against any plumbing, heating, or fire sprinkler contractor, or any combination thereof, who is licensed under the provisions of this Article. All of the charges shall be in writing and investigated by the Board. Any proceedings on the charges shall be carried out by the Board in accordance with the provisions of Chapter 150B of the General Statutes.

(2) The Board shall adopt and publish guidelines, consistent with the provisions of this Chapter, governing the suspension and revocation of licenses.

(3) The Board shall establish and maintain a system whereby detailed records are kept regarding complaints against each licensee.