Thoroughly inspected 3 zone gas furnace with humidifier to solve water leak issue. Only occurs during winter months, with November 2022 being the first instance. Removed humidifier pad and flushed condensate drain. Found EZ trap float switch stuck. Possibility that water was back flowing past EZ trap, into evap coil pan and overflowing down through furnace into emergency drain pan. Freed stuck float switch, blew out and flushed condensate drain again. System draining properly. Tested humidifier with all three zones independently. System operating properly at this time.