According to the site, the citation was because "the facility staff failed to maintain comfortable and safe temperatures inside the facility during the time a local, excessive heat warning had been issued by the National Weather Service."
A Class I violation, as defined by the Department of Health and Senior Services, is:
"A violation which presents either an imminent danger to the health, safety or welfare of any resident or a substantial probability that death or serious physical harm would result. This is the most severe classification of State deficiencies. If an inspection results in any Class I violations, inspectors will revisit the facility within 20 days."