Why is my dishwasher leaking? Causes and fixes

By: Reliable Parts • July 2026

A leaking dishwasher is most often caused by a worn door gasket, a failed pump or motor seal, or a loose hose under the tub. Water at the door points to the gasket or a spray arm; water under the unit points to the pump seal, hoses, or inlet valve. The wrong detergent forces suds past the door seal. Identify your dishwasher’s model number to order the correct replacement parts.

Need step-by-step instructions for your specific brand and model? Visit our DIY Repair Guide and filter by appliance and brand.

Most common causes

1. Worn or damaged door gasket — the tub seal hardens, tears, or picks up debris and lets water seep out the door edges.
2. Failed pump or motor seal — the shaft seal on the circulation or drain pump wears out and drips from the motor area under the tub.
3. Loose or split hoses — the drain hose, circulation hoses, and their clamps loosen with heat cycling and vibration.
4. Leaking water inlet valve — the valve or its fitting seeps whenever the water supply is pressurized, even between cycles.
5. Cracked or blocked spray arm — a damaged arm or clogged nozzles blast water at the door seam instead of upward.
6. Wrong detergent or overdose — regular dish soap or excess detergent creates foam that pushes water past the door gasket; a usage issue, not a part failure.

Step-by-step diagnosis

1. Confirm it isn’t a suds problem. If anyone used hand dish soap, or foam is visible at the door, run a rinse cycle with no detergent and a cup of white vinegar in the tub, then switch to a measured dose of dishwasher detergent.
2. Watch the door edges during a wash cycle. Water tracking from the sides or bottom of the door implicates the gasket or spray pattern. Inspect the tub gasket for tears, hardening, and trapped food, and wipe it clean before condemning it.
3. Check the spray arms. Remove them, clear clogged nozzles with a toothpick, and look for cracks - a cracked lower arm sprays a jet directly at the door seam. Confirm nothing in the racks blocks the arms’ rotation.
4. Remove the kick panel and run a cycle with a flashlight on the underside. Follow the drip upward to its highest wet point - leaks travel along hoses and the frame, so the wet spot on the floor rarely sits under the actual source.
5. Inspect the drain hose, circulation hoses, and clamps under the tub. Tighten loose clamps and replace hoses that are cracked, bulged, or hardened.
6. Check the pump and motor seal. Water dripping from the motor housing or the pump-to-tub interface during wash means the shaft seal has failed. Depending on the model, replace the seal kit or the pump assembly.
7. Check the water inlet valve and the float. A valve that weeps at its body or fitting needs replacement, and a stuck float or failed float switch overfills the tub until water finds the door seam. Verify the fill level sits below the heating element.

Replacement parts to consider

Common parts for a leaking dishwasher: door gasket, pump and motor seal kit, drain hose, water inlet valve, spray arm, float switch, hose clamps. Enter your dishwasher’s model number on reliableparts.com for the exact parts for your specific model.

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