Make sure you check for sudsy water. Cancel the cycle if you see excessive suds. 3 minutes is how long the drain pump will run for. If the drain pump can't drain the sudsy water, you can use a wet/dry shop vacuum to remove the water. If the detergent dispenser is damaged, you should replace it. Do not use dishwasher detergent in the dishwasher. Excess suds can be caused by using regular dish soap in the dishwasher. If you don't see a lot of suds, you should check the water fill level in the tub. The overfill float mushroom should not be affected by the water level. If the water level is too low, look for bowls or containers that flipped over during the cycle that could hold water. Load items so they don't flip over and cause low water level. The low water level could be caused by a faulty water inlet valve if you didn't find bowls or containers flipped over. To shut the water supply valve, unplug the dishwasher. The water supply line needs to be disconnected from the water inlet valve. If the screen on the water valve is blocked, it can cause the valve to stick open and cause flooding in your kitchen. If the screen is clear, place the end of the water supply line in a shallow pan and open the valve to see if the water comes from the supply line. If there is a problem with the dishwasher's water supply, you should have a professional fix it. If the water flows okay, check the wiring connections on the water inlet valve and connect any loose wires or replace the wire harness if necessary. The water inlet valve may need to be replaced if the wires are okay.
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