Dishwasher Has Bad Smell: How to Fix It
Quick answer
To fix a smelly dishwasher, clean the filter, check for food debris, and run a cleaning cycle with vinegar or a dishwasher cleaner. Regular maintenance prevents odors.
Confirm the symptom
- Dishwasher emits a foul odor when running
- Smell comes from the drain area
- Odor is noticeable even when the dishwasher is empty
Tools and prep
- Plastic scraper — For removing debris from the filter
- White vinegar — Natural cleaner for removing buildup
- Microfiber cloth — For wiping interior surfaces
- Dishwasher cleaner — Commercial cleaner for tough odors
Disclosure: We may earn a commission from qualifying purchases via affiliate links. Learn more.
Prep & safety
- Unplug the dishwasher to ensure safety before cleaning.
- Remove any dishes or debris from the dishwasher interior.
Step-by-step troubleshooting
Locate and Remove the Filter
Do: Find the filter at the bottom of the dishwasher and remove it.
Observe: Filter is clogged with food particles and debris.
Means: Clogged filter is causing the odor.
Next: Clean the filter thoroughly.
Clean the Filter
Do: Use a plastic scraper and warm water to remove debris from the filter.
Observe: Filter is now clean and free of debris.
Means: Filter is no longer a source of odor.
Next: Rinse and reinsert the filter.
Wipe Interior Surfaces
Do: Use a microfiber cloth and white vinegar to wipe down the interior walls and door.
Observe: Interior surfaces are clean and free of residue.
Means: Surface buildup is removed, reducing odor sources.
Next: Run a cleaning cycle.
Run a Cleaning Cycle
Do: Place a cup of white vinegar in a dishwasher-safe cup on the top rack and run a hot water cycle.
Observe: Vinegar neutralizes odors and removes buildup.
Means: Interior is sanitized and deodorized.
Next: Check for lingering smells.
Check the Drain
Do: Inspect the drain area for trapped food particles or mold.
Observe: Drain is clogged or has visible mold.
Means: Drain blockage is causing the odor.
Next: Clean the drain thoroughly.
Clean the Drain
Do: Use a plastic scraper or brush to remove debris from the drain and surrounding area.
Observe: Drain is clear and free of debris.
Means: Drain is no longer a source of odor.
Next: Run another cleaning cycle.
Use a Dishwasher Cleaner
Do: Follow the instructions on a commercial dishwasher cleaner tablet or powder.
Observe: Cleaner dissolves buildup and neutralizes odors.
Means: Interior is thoroughly cleaned and deodorized.
Next: Plug in the dishwasher and test it.
Test the Dishwasher
Do: Plug in the dishwasher and run a normal cycle with a load of dishes.
Observe: Dishwasher runs without emitting a foul odor.
Means: The odor issue is resolved.
Next: Complete
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Clogged filter | Food particles and debris trapped in the filter cause odor. | High | Low | Filter |
| Food buildup in drain | Trapped food in the drain leads to mold and odor. | High | Low | Drain components |
| Interior mold or mildew | Moisture and residue create mold, causing bad smells. | Medium | Low | None |
| Hard water residue | Mineral buildup traps odors and affects cleaning. | Medium | Low | Water softener |
| Faulty drain pump | A malfunctioning pump can cause water to stagnate and smell. | Low | High | Drain pump |
| Improper ventilation | Poor airflow in the kitchen can trap odors from the dishwasher. | Low | Medium | Ventilation system |
Parts matching
Replace parts if they are damaged or worn out. Ensure compatibility with your dishwasher model.
- Filter: match the model number from the dishwasher manual
- Drain components: ensure the size matches the drain opening
- Drain pump: verify compatibility with your dishwasher brand and model
Consult your dishwasher's manual for specific part numbers and installation instructions.
Disclosure: We may earn a commission from qualifying purchases via affiliate links. Learn more.
When to call a pro
- If the odor persists after multiple cleaning attempts
- If the drain pump is suspected to be faulty
- If you notice water leakage or electrical issues
- If the dishwasher does not drain properly after cleaning
FAQ
How often should I clean my dishwasher filter?
Clean the filter every 1-2 months to prevent odor and buildup.
Can I use bleach to clean my dishwasher?
Avoid using bleach as it can damage the dishwasher and leave harmful residues. Use vinegar or a commercial cleaner instead.
Why does my dishwasher smell even after cleaning?
Persistent odors may indicate a deeper issue like a faulty drain pump or hard water problems.
Is it normal for my dishwasher to have a slight smell after use?
A mild odor is normal, but a strong or foul smell indicates a problem that needs attention.