Dishwasher Has a Smell (Troubleshooting Guide)

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Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

A smelly dishwasher is often caused by trapped food or mold. Clean the filter, run a vinegar cycle, and check for mold in the door gasket. Regular maintenance prevents future smells.

Confirm the symptom

Dishwasher emits a foul odor when running or sitting idle
Smell worsens after a cycle finishes
Dishes smell bad after being cleaned
Interior looks damp or has visible mold

Tools and prep

Rubber gloves
White vinegar or dishwasher cleaner
Soft brush or toothbrush
Clean cloth or paper towels
Flashlight
Plastic scraper (optional)
Turn off power at the circuit breaker before cleaning

Step-by-step troubleshooting

Check and Clean the Filter
Do: Locate the filter at the bottom of the dishwasher and remove it. Rinse it under running water to remove trapped food particles.
Observe: Filter has visible debris or is clogged
Means: Clogged filter is causing odor
Next: Clean the filter thoroughly and reinstall it
Clean the Door Gasket
Do: Inspect the rubber door gasket for mold or mildew. Wipe it with a vinegar-soaked cloth and dry thoroughly.
Observe: Mold or dampness is present on the gasket
Means: Mold growth is causing the smell
Next: Dry the gasket completely to prevent regrowth
Run a Vinegar Cycle
Do: Place a cup of white vinegar in a dishwasher-safe container on the top rack. Run a hot water cycle without dishes.
Observe: Odor reduces after the cycle
Means: Mineral buildup or mild odors were the cause
Next: Wipe down interior with a damp cloth after the cycle
Check for Standing Water
Do: Look for water pooled at the bottom of the dishwasher. Use a cloth to dry the area completely.
Observe: Standing water is present
Means: Moisture is fostering bacterial growth
Next: Ensure the dishwasher drains completely after each cycle
Inspect the Detergent Dispenser
Do: Open the detergent dispenser and check for old or clumped detergent. Clean out any residue with a damp cloth.
Observe: Old detergent or residue is present
Means: Stale detergent is causing the smell
Next: Replace with fresh detergent
Check the Drain Hose
Do: Inspect the drain hose for clogs or debris. Use a plastic scraper or brush to remove any blockages.
Observe: Clogs or debris are found in the hose
Means: Poor drainage is causing odor
Next: Clear the hose and ensure it's properly connected

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Filter Trapped food particles decompose and create odor	Common	Easy	Dishwasher filter (if damaged)
Mold in Door Gasket Moisture in the gasket promotes mold growth	Common	Easy	None (cleaning usually fixes)
Mineral Buildup Hard water leaves deposits that trap odor	Sometimes	Easy	Dishwasher cleaner or vinegar
Standing Water Water sitting in the dishwasher fosters bacterial growth	Common	Easy	None (improve drainage)
Old Detergent Residue Stale detergent can smell and affect cleaning	Sometimes	Easy	Fresh detergent
Clogged Drain Hose Debris in the hose prevents proper drainage	Sometimes	Easy–Medium	None (cleaning usually fixes)
Malfunctioning Drain Pump Failed pump doesn't remove water, leading to odor	Rare	Hard	Drain pump assembly

Parts matching

Replace parts if cleaning doesn't resolve the smell:

Dishwasher filter (if damaged or worn)
Dishwasher cleaner or white vinegar for mineral buildup
Drain pump assembly (if standing water persists after cleaning)

Purchase OEM parts for compatibility and performance.

When to call a professional

Strong, persistent odor remains after multiple cleaning attempts
Standing water returns immediately after being removed
Dishwasher makes unusual noises or doesn't drain at all
You suspect a broken drain pump or electrical issue
You're unsure about handling electrical components or internal parts

FAQ

How often should I clean my dishwasher filter?

Clean the filter every 1–2 months to prevent clogs and odors.

Can I use bleach to clean my dishwasher?

Avoid bleach as it can damage rubber parts. Use vinegar or a dishwasher-specific cleaner instead.

Why does my dishwasher smell even after cleaning?

Persistent odor may indicate a deeper issue like a malfunctioning drain pump or hidden mold.

Is it normal for my dishwasher to have a slight smell after a cycle?

A mild smell is normal, but a strong or foul odor indicates a problem that needs attention.

Can hard water cause dishwasher odors?

Yes, hard water can leave mineral buildup that traps odors. Use a water softener or dishwasher cleaner to help.