Dishwasher Leaking From Pump – How to Diagnose and What Part Fixes It
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Understanding the Problem
A leak originating from the pump area (the sump at the bottom of the tub) is a common dishwasher failure. The dishwasher pump area contains the drain/circulation pump, seals, housing/sump and several hoses; any failed seal, cracked housing, loose hose clamp, or worn pump bearing can allow water to escape under the appliance. Leaks may appear while filling, during a wash cycle, or when the unit drains. Because the pump area is under the tub, you’ll typically need to pull the dishwasher out, remove the toe-kick or lower access panel, and inspect the sump/pump from underneath or inside the tub. Replacing a bad pump, pump seal, or sump gasket usually fixes the leak. In some cases the pump housing is cracked or a hose/clamp is damaged and needs replacement instead of the entire pump motor assembly.
Common Symptoms
Puddles under the dishwasher, water leaking from the front lower edge, leaks only during drain or wash cycles, unusual noise from the pump, or the dishwasher stopping mid-cycle.
Common Causes
- Worn or failed pump shaft seal/mechanical seal allowing water past the motor shaft.
- Cracked or damaged pump housing/sump body that leaks under pressure.
- Loose or cracked drain/discharge hoses or hose clamps causing leakage during drain.
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at PartsDiscount.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
Run a short cycle with the front kickplate removed and a towel under the pump area to pinpoint whether the leak occurs during fill, wash, or drain—this helps determine which pump/part is failing.
Frequently Asked Questions
Can I keep using the dishwasher if it's leaking from the pump?
You should stop using the dishwasher until you locate and fix the leak. Continued use can damage flooring, cabinetry, and the dishwasher’s electrical components. You can run a short test cycle with a bucket and towels in place to confirm the leak source, but avoid regular operation until repaired.
Is replacing the pump expensive and can I do it myself?
Parts cost varies: seals and gaskets are inexpensive ($10–$40); full pump assemblies range roughly $40–$200 depending on brand. Labor varies if you hire a technician. Many homeowners with basic tools and comfort removing the unit from under the counter can replace a pump or seal themselves — always disconnect power and water first and verify the correct replacement part for your model.
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