There are items stuck under the overfill float. A faulty water inlet valve can cause the float switch to trip open. The dishwasher will cause the float switch to trip if the water inlet valve is open. The water inlet valve should be replaced if this happens. A faulty float switch is a third cause for the error code. To check the resistance through the overfill float switch, unplug the dishwasher. The dishwasher tub should be empty if you want to measure resistance. The float switch should be replaced if you measure infinite resistance.
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