Standing water in a KitchenAid dishwasher usually means the drain path is blocked or the drain pump is not moving water. A few checks at the sump, the sink connection, and the air gap will tell you whether this is a simple clearing job or a failed part.
Turn off the circuit breaker that feeds the dishwasher, and the breaker that feeds the garbage disposal if the two share a circuit at the sink. Close the shutoff valve on the dishwasher supply line under the counter. Water and 120-volt power sit together inside this appliance, and the sump, the drain pump, and the wiring are all within reach once the lower access panel comes off. Confirm the power is dead before you put a hand inside.
The basic checks are safe to do yourself: pull the filter, look for debris, clear the air gap cap, and follow the hoses for kinks. Anything beyond that, such as pulling the drain pump, replacing a check valve, or touching wiring, is work for a qualified technician. If water has been standing for several days, or you see water spreading under the cabinet, stop and call for service instead of running the machine again.
KitchenAid dishwashers pass wash water through a filter in the sump before it drains, and many models add a hard-food chopper that grinds soft debris so it can wash away. Grease, starch, and hard-water scale coat the filter screen and slow the flow. When the filter clogs, the machine finishes the wash but cannot push the water out during the drain portion of the cycle.
Lift out the lower rack, remove the filter assembly, and rinse it under hot running water. Check the chopper area for a jammed object. A piece of bone, a pistachio shell, or a shard of glass can stop the chopper from turning and hold debris in place above it. Reinstall the filter only after it seats fully; a filter that sits crooked lets debris reach the pump.
When the control board calls for a drain, the pump moves water out through the drain hose. KitchenAid uses two designs. Many models have a separate drain pump, while others use a reversing wash pump that spins one direction to wash and the other direction to drain. On a separate pump, a failed motor means silence at the drain step. On a reversing pump, a jammed impeller stops the reversal and leaves water in the tub.
Listen during the drain portion of the cycle. A hum with no water movement points to a jammed impeller. Nothing at all points to a dead motor or a control that is not sending the command. Glass, seeds, and hard food debris are the usual impeller jams. Clearing the impeller is a repair rather than a cleaning step, because the pump has to come out of the sump.
The check valve is a flapper or a ball that lets water leave the sump and keeps it from flowing back in. When it sticks open, dirty water returns to the tub after the drain ends and you find a shallow pool the next morning. When debris wedges it shut, water cannot leave the sump at all and the tub holds the previous load's wash water.
You can often see the check valve once the filter and the lower spray arm are out. Look for a flapper held open by grease or a ball seat packed with debris. Clean the area as far as the manufacturer's manual allows. If the valve is warped, cracked, or will not seat after cleaning, it needs replacement, which means opening the sump.
If a disposal was installed or replaced and the dishwasher drain hose was connected to it, the plastic knockout plug inside the disposal's dishwasher inlet may still be in place. That plug blocks the hose completely. The dishwasher runs a full cycle, the drain pump pushes against a sealed port, and the water stays in the tub. This is a common reason a dishwasher stops draining after a kitchen remodel.
To check it, turn off the breaker feeding the disposal, disconnect the dishwasher hose from the disposal inlet, and look inside the port with a flashlight. The plug is a molded plastic disc that you knock loose with a large screwdriver or a punch, then retrieve from inside the disposal chamber. Wear gloves, and confirm the disc came out whole before you reconnect the hose with its clamp seated tight.
Most San Diego kitchens have a countertop air gap between the dishwasher and the disposal. Its job is to keep dirty sink water from siphoning back into the dishwasher. The air gap has a cap and internal passages that clog with grease and food particles. When it clogs, water rises in the gap or backs into the dishwasher instead of draining. Twist off the cap, clear the passages, and check the hose that runs from the gap to the disposal.
The drain hose itself can kink behind the cabinet or sag so that it holds water. Confirm the hose runs with a high loop, is not crushed against a wall, and is clamped tightly at both ends. A hose pushed too far into the disposal, or one with a sag, will slow or stop drainage. Replace a hose that has hardened or cracked.
If the filter is clean, the air gap and the hose are clear, and the pump is still silent or still humming without moving water, the fault is inside the machine. That can be a failed drain pump, a stuck check valve, or a control board that is not sending voltage at the drain step. A diagnostic visit identifies the real failure before any part is ordered, and it gives you a firm quote.
Book a $95 dishwasher diagnostic and find out what is holding the water in.
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