24 CFR §28.30

1. (a)The respondent may file a written response to the complaint, in accordance with § 26.30 of this title, within 30 days of service of the complaint. The response shall be deemed to be a request for a hearing. The response must include the admission or denial of each allegation of liability made in the complaint; any defense on which the respondent intends to rely; any reasons why the penalties and assessments should be less than the amount set forth in the complaint; and the name, address, and telephone number of the person who will act as the respondent's representative, if any.
2. (b)Failure to respond. If no response is submitted, HUD may file a motion for default judgment in accordance with § 26.41 of this chapter.