The float in your dishwasher rises as the water level in the appliance increases. When the float reaches a certain level, it signals the float switch to turn the flow of water off. If the float becomes stuck and can not rise, the float switch will not be activated, and your dishwasher will overflow.

How do I fix my overflowing dishwasher?

Dishwasher Overflowing With Water? 7 Possible Fixes
Reduce the soap.Inspect the door gaskets.Unclog the bottom.Check the hose for a leak.Replace the water inlet valve.Fix the float assembly.Replace a broken wash arm.

Can dishwasher leak if overloaded?

Overloaded Machine

There is a fine line between full and overload. Additionally, overloading the dishwasher can actually make it leak. The water inside the machine is diverted from the tank bottom and splashes out under the door.