ST. PAUL — Cleanup continued Tuesday after a heating system failure caused water damage and disrupted operations at the Minnesota Department of Health’s laboratory.

The department said the failure happened early Monday, causing heating coils within the air handler system to freeze and water to leak on several floors. Damage could top $1 million.

Crews have stabilized heat in the building and begun repairing broken parts of the heating system, the department said. Crews also are removing damaged building materials and repairing electrical equipment. The heating system is expected to be fully restored Wednesday.

Officials said the infectious disease and newborn screening labs may be able to reopen Wednesday. But the second-floor environmental lab sustained the worst damage and will take longer to repair.