Ill. Admin. Code tit. 56 § 2605.310
Any party failing to appear at a Hearing shall waive its right to present evidence. If the Hearing Officer determines that proper notice was given, the Hearing Officer shall grant affirmative relief to the party appearing or enter an order dismissing the Petition for Hearing or Notice of Charges, with prejudice. A party fails to appear if the party does not appear at the time, date, and place designated for the Hearing; a party fails or refuses to proceed with the Hearing; or a party failed to notify the Department of a change of address, and a notice of the Hearing, sent to the party's last known address, was returned as "undeliverable", "unclaimed", "refused", "moved", or "no forwarding address" or any other type of returned mail, via postal or electronic method.
Ill. Admin. Code tit. 56, § 2605.310