Ill. Admin. Code tit. 20, § 1790.250
Absent a compelling reason, failure to appear at the time and place set for hearing shall be deemed a waiver of the right to present evidence unless otherwise reflected by order of the ALJ. After presentation by the nondefaulting party of proof that the defaulting party was given proper notice and the nondefaulting party has been given an opportunity to present evidence that would have been presented at the hearing in which the default occurred, the ALJ shall make his or her decision as required under Section 1790.630.