Dishwashers depend on a timed cycle that involves the timely release of adequate amounts of water to wash your dishes and then the draining of that water to avoid flooding. If your dishwasher has recently stopped draining properly, you might've ended up with a mess of stagnant water either on your kitchen floor or pooled at the bottom of the dishwasher.
There are a couple problems that can potentially cause your dishwasher to stop draining properly. You might be able to diagnose the problem on your own, but if you don't have professional experience, you might want to leave the more complicated fix in the hands of an appliance repair professional or a plumber, depending on the problem.
The dishwasher has a filter that is meant to catch food particles in the water that drains out to prevent blocks further down the line. The filter needs to be emptied and cleaned regularly, or the food particles could block the exit route for the water, and you could be left with pooling water.
Consult your owner's manual to find the location of your filter. The filter is usually on the bottom or floor of the dishwasher tub under where the lower spray arm is located. You might need to manually rotate the spray arm out of the way to access the filter. Or the filter might be on the rear wall of the tub located between the two racks.
Take out the filter, dump any food into the trash, and then rinse out the filter using the sprayer on your kitchen sink. If the filter looks sandy or otherwise caked with mineralization, you can soak the filter in a demineralizing cleaner according to package directions then rinse with a kitchen spray.
Water Inlet Valve
The water inlet valve is a sensor inside the dishwasher that allows water into the tub from your home's water supply when the time is right. When enough water is inside, the valve shuts off so you don't end up with excess water. A clogged or malfunctioning valve can let in more water than necessary, which won't have the time to drain out by the time the unit finishes cleaning your dishes.
The water inlet valve can be tested using a multi-meter, but that only ensures that the device has continuity. Call in an appliance repair technician to ensure that the part is working properly.
There's also a chance that your water inlet valve is working but the water pressure coming into the supply line is too strong. If you've noticed that water pressure around your home has been intensifying, call in a plumber to check for signs of a problem in your lines. A blockage in one area can intensify the pressure in other areas.
For more information, contact Jerry's Appliance Service or a similar company.