Full blockage on the 3-in floor drain is causing backups into the three-quarter inch pipe and intermittent shutdown of the drain safety float switch Clear blockage in the 3-in floor drain with 60psi house water pressure Power flush and freshwater flush the ¾ inch drain pipe from the air coil to the floor drain and reset drain safety switch Clean as much water as possible from the floor, the remainder will dry naturally. Tenants did not detect any water on the carpet in any other adjacent rooms Recommend homeowners consult professional sewer cleaning company