Haw. Code R. § 12-41-22
A hearings officer may withdraw from a proceeding when ever disqualification is deemed necessary. Any party may request the hearings officer, at any time and before filing of the report, to withdraw on grounds of personal bias or prejudice, by filing promptly upon the discovery of the alleged facts a timely affidavit setting forth in detail the matters alleged to constitute grounds for disqualification. If, in the opinion of the hearings officer, the affidavit is filed with due diligence and is sufficient on its face, the hearings officer shall be disqualified and withdraw from the proceeding. If the hearings officer is not disqualified and shall not withdraw from the proceeding, it shall be so ruled upon the record, setting the grounds for the ruling, and the hearings officer shall proceed with the hearing or, if the hearing has closed, shall proceed with the issuance of the report.
Haw. Code R. § 12-41-22