430 ILCS 135/15: Violation.

(a) Willful failure to install or maintain in operating condition any carbon monoxide alarm required by this Act is a Class B misdemeanor.

(b) Tampering with, removing, destroying, disconnecting, or removing the batteries from any installed carbon monoxide alarm, except in the course of inspection, maintenance, or replacement of the alarm, is a Class A misdemeanor in the case of a first conviction and a Class 4 felony in the case of a second or subsequent conviction.