Direct answer: If your KitchenAid dishwasher is not draining, the usual cause is a blockage in the filter, sump, drain hose, air gap, or sink drain connection rather than a failed internal part.
Most likely: Start with the standing water, remove and clean the dishwasher filter, check the sump for debris, then inspect the drain hose path and the sink-side connection for a clog or kink.
A little water under the filter area can be normal. A tub full of dirty water at the end of the cycle is not. Reality check: most dishwashers that ‘need a pump’ really need a clog cleared first. Common wrong move: running cycle after cycle with food sludge still packed around the filter and sump cover.
Don’t start with: Don’t start by ordering a dishwasher drain pump. On most no-drain calls, the pump is trying to move water through a blocked path.
After the cycle, you see a small puddle down in the filter well but not a full tub of water.
Start here: Check your owner expectations first, then clean the dishwasher filter and make sure the water level is not rising above the filter plate.
The cycle ends and the bottom of the tub is covered with cloudy or greasy water.
Start here: Go straight to the dishwasher filter, sump debris check, and the sink-side drain path.
You hear the dishwasher try to drain, but the water level barely changes.
Start here: Look for a blocked dishwasher drain hose, clogged sink air gap if equipped, or debris jammed in the drain pump area.
Water may gurgle at the sink, back up through an air gap, or drain only after a long delay.
Start here: Inspect the sink drain connection and air gap first, because the restriction may be outside the dishwasher.
This is the most common cause when the machine finishes with dirty standing water and no obvious leak. Food labels, glass chips, bones, and grease collect where the drain path starts.
Quick check: Remove the lower rack, take out the dishwasher filter, and look for sludge or hard debris around the sump opening.
A dishwasher can sound like it is draining but move very little water if the hose is pinched behind the unit or packed with grease and debris.
Quick check: Follow the dishwasher drain hose from the machine to the sink connection and look for sharp bends, low spots full of gunk, or a crushed section.
If the dishwasher shares the sink drain or disposal connection, a blockage there can stop draining even when the dishwasher itself is fine.
Quick check: If you have an air gap on the sink, remove the cap and check for debris. Also inspect the dishwasher hose connection where it ties into the sink drain.
Once the filter and drain path are clear, a pump that only hums, clicks, or moves no water becomes more likely.
Quick check: After clearing the easy blockages, run a drain cycle and listen. A strong pump sound with no flow points back to a blockage. A weak hum or silence points toward the dishwasher drain pump or wiring.
A little water in the lowest sump pocket is normal on many dishwashers. You want to separate normal residual water from a true no-drain condition before taking anything apart.
Next move: If only a small amount remains down in the sump and the rest of the tub is clear, you likely do not have a major drain failure. If dirty water remains across the bottom of the tub, keep going with blockage checks.
What to conclude: This tells you whether you are chasing a normal condition, a partial restriction, or a full no-drain problem.
This is the highest-payoff check on a dishwasher that will not drain. Most homeowner no-drain calls end right here.
Next move: If the next drain cycle pulls the water out normally, the clog was at the filter or sump entrance. If the water level barely changes, the restriction is farther along the drain path or the dishwasher drain pump is not moving water.
What to conclude: A dirty filter or blocked sump starves the drain path right at the source and is far more common than a bad control or major internal failure.
A dishwasher can be perfectly fine and still not drain if the blockage is where the hose empties into the sink drain system.
Next move: If the dishwasher drains after clearing the sink-side connection, the machine itself was not the problem. If the sink-side connection is clear and the dishwasher still leaves water behind, inspect the dishwasher drain hose next.
Once the filter and sink connection are clear, the hose itself becomes the next likely restriction point.
Next move: If the hose was blocked or pinched and the dishwasher now drains strongly, you found the restriction. If the hose path is clear and the dishwasher still hums or leaves water, the dishwasher drain pump is the next likely failure point.
By this point you have ruled out the common blockages. Now you are deciding whether the dishwasher drain pump is jammed, weak, or not running at all.
A good result: If a new or cleared pump restores a fast, steady drain, the repair is complete.
If not: If a confirmed clear drain path and a working pump still do not solve it, stop there and have the dishwasher professionally diagnosed for wiring or control issues.
What to conclude: A pump diagnosis only makes sense after the easy restrictions are ruled out. That keeps you from buying the wrong part.
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Because washing and draining use different parts of the system. The dishwasher can fill and spray normally while the filter, sump, drain hose, air gap, or sink-side connection is clogged. That is much more common than a major electrical failure.
Yes. A small amount down in the lowest sump area can be normal. What is not normal is dirty water spread across the tub floor or water left high enough to cover the filter area after the cycle ends.
Yes. If the dishwasher drains through a disposal, a clogged disposal inlet or an unremoved knockout plug after a recent disposal install can stop the dishwasher from draining. Check that sink-side connection before blaming the dishwasher.
Suspect the dishwasher drain pump only after the filter, sump, drain hose, and sink-side drain path are clear. A weak hum, clicking, or no pump sound during the drain portion points more toward the pump. A strong pump sound with no water movement usually still points to a blockage.
No. Chemical drain cleaners can damage dishwasher parts, seals, and nearby plumbing, and they create a safety hazard when you open the drain path later. Stick with manual cleaning and blockage removal.
That usually means a partial restriction rather than a complete blockage. Grease in the dishwasher drain hose, debris in the filter or sump, or a clogged air gap are the usual causes.