Run a short drain-only cycle and listen for the drain pump motor humming or running.

Check the sink garbage disposal — run and clear it, then remove the knockout plug if newly installed.

Inspect the air gap (if present) for debris and clean it out.

Remove and inspect the drain hose and pump inlet for clogs or foreign objects.

Dishwasher Not Draining

If your dishwasher leaves water in the tub after a cycle or won't pump water out at all, it's a common issue usually caused by a clogged drain, a failed pump, or a faulty air gap or check valve.

Fixing a dishwasher that won’t drain can often be done in an hour with basic tools — save on service calls and get your kitchen back to normal fast.

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Common Causes

Clogged dishwasher drain hose or trap
Blocked or broken garbage disposal connection
Failed dishwasher drain pump motor
Clogged or stuck air gap
Faulty check valve in pump assembly
Wiring or control board preventing drain cycle

Common Symptoms

Standing water remains in the tub after the cycle
Partial drainage leaving a few inches of water
Gurgling noises or slow draining
Error code related to drainage on display
Foul smells from trapped food and water
Dishwasher starts but never reaches drain step

Why This Happens: Dishwasher Not Draining

Most drainage failures come from a simple obstruction in the drain path. Food debris, grease, soap residue, or a clogged garbage disposal connection can block the hose, air gap, or pump inlet so water can’t escape. Mechanical failures are another common cause: the drain pump motor can burn out, an internal check valve can stick, or the air gap/float assembly can fail. Electrical issues like a faulty door latch, timer, or control board can also prevent the drain cycle from starting.

Best Parts to Check First

Dishwasher Drain Pump Assembly (universal / OEM equivalent)

Replaces the pump that expels water from the tub; a common wear item when the motor burns out or impellers break.

Dishwasher Drain Hose (6-ft corrugated / smooth)

Replacement drain hose between dishwasher and disposal or standpipe; used when collapsed, kinked or clogged.

Air Gap Assembly

Deck-mounted air gap prevents backflow from the sink/disposal and often clogs with debris; cleaning or replacement restores proper flow.

Check Valve / Inlet Valve (dishwasher pump check)

One-way valve inside or attached to the pump that stops backflow; replacement needed if stuck or broken.

Quick Diagnosis Guide

Run a short drain-only cycle and listen for the drain pump motor humming or running.
Check the sink garbage disposal — run and clear it, then remove the knockout plug if newly installed.
Inspect the air gap (if present) for debris and clean it out.
Remove and inspect the drain hose and pump inlet for clogs or foreign objects.

Quick Troubleshooting Steps

Turn off power to the dishwasher at the breaker and disconnect the water supply if needed.
Remove lower rack and filter, then clear any visible food debris from the tub and filter area.
Locate and test the drain pump by running a drain cycle while logging whether the pump runs or is silent.
Disconnect and inspect the drain hose for clogs — flush with water or a narrow brush; replace if kinked or collapsed.
Check and clean the air gap on the sink and the garbage disposal knockout plug if recently installed.
If the pump is noisy, not running, or impellers are damaged, replace the drain pump assembly.

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Store	Part Example	Price	Shipping	Restocking Fees	Action
PartsDiscount.com BEST VALUE	Dishwasher Drain Pump Assembly (universal / OEM equivalent)	$59.99	FREE	NO	Buy Now
AppliancePartsPros	Dishwasher Drain Pump Assembly (WPW10314787 or equivalent)	$74.99	Extra	Yes	-
RepairClinic	Dishwasher Drain Pump Motor Assembly (OEM fit)	$89.99	Extra	Yes	-
PartSelect	Dishwasher Drain Pump Kit (model specific)	$99.99	Extra	Yes	-

*Prices are examples and may vary based on specific model numbers.

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