Dishwasher with overflow conduit

A dishwasher for treating dishes according to at least one cycle of operation, the dishwasher comprising:

• a tub at least partially defining a treating chamber and defining an access opening;
• a sprayer providing a spray of liquid into the treating chamber;
• a liquid recirculation system defining a recirculation flow path for recirculating the sprayed liquid from the treating chamber to the sprayer;
• an air supply system having a blower, an air supply conduit having an outlet and configured to provide air to the treating chamber, and an air return conduit having an inlet and configured to remove air from the treating chamber wherein at least one of the air supply conduit outlet or the air return conduit inlet are located in a lower portion of the treating chamber;
• a base pan located outside the treating chamber and fluidly coupled to the at least one of the air supply conduit outlet or the air return conduit inlet;
• and
• a float mechanism located in the base pan and configured to detect liquid in the base pan during the over fill event;
• and
• wherein the at least one of the air supply conduit or the air return conduit is configured to function as an overflow conduit to remove liquid from the treating chamber when the liquid is a predetermined amount above a normal operating condition, which is indicative of an over fill event.