Quick answer
A smelly dishwasher is often caused by trapped food particles or mold. Clean the filter, rinse aid dispenser, and interior to eliminate the odor. Run a hot water cycle with vinegar or a dishwasher cleaner.
Confirm the symptom
- Dishwasher emits a foul or musty odor
- Smell is strongest after a cycle ends
- Dishes smell bad after washing
- Odor persists even when empty
Tools and prep
- Rubber gloves
- White vinegar or dishwasher cleaner
- Microfiber cloth
- Spoon or small brush
- Old towel
- Warm water
- Turn off power to dishwasher at circuit breaker or unplug
- Turn off water supply if deep cleaning is needed
Step-by-step troubleshooting
- Clean the FilterDo: Remove the filter from the bottom of the dishwasher and rinse it under warm water. Use a brush to scrub away food debris.Observe: Filter is clogged with food particles and grimeMeans: Clogged filter is causing odorNext: Proceed to clean the drain
- Clean the DrainDo: Locate the drain hose and use a towel or brush to remove any debris. Check for standing water and dry it thoroughly.Observe: Drain is blocked or has standing waterMeans: Poor drainage leads to mold and odorNext: Clean the interior
- Clean the InteriorDo: Wipe down the interior walls, door, and seals with a vinegar solution or dishwasher cleaner. Pay attention to crevices and the door gasket.Observe: Interior has residue or mold buildupMeans: Mold and residue contribute to bad smellsNext: Run a cleaning cycle
- Run a Cleaning CycleDo: Place a cup of white vinegar in a dishwasher-safe container on the top rack. Run a hot water cycle without dishes to clean and deodorize.Observe: Odor improves or disappears after the cycleMeans: Effective cleaning has occurredNext: Monitor for recurring odor
- Check the Rinsing Aid DispenserDo: Remove the dispenser and clean it with warm water and vinegar. Ensure it is free of clogs and debris.Observe: Dispenser is clogged or has residueMeans: Clogged dispenser can cause odorsNext: Reassemble and test
- Reassemble and TestDo: Reinstall all cleaned parts and restore power and water supply. Run a normal cycle with dishes to check for lingering odor.Observe: Dishwasher operates without odor after cleaningMeans: Problem resolved through cleaningNext: Maintain regular cleaning schedule
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Filter Food particles trapped in the filter decompose and cause odor. | Common | Easy | Dishwasher filter |
| Mold and Mildew Moisture trapped in seals or interior promotes mold growth. | Common | Easy–Medium | Dishwasher cleaner |
| Clogged Drain Standing water in the drain leads to bacterial growth and odor. | Common | Easy | Drain hose |
| Unclean Rinsing Aid Dispenser Residue in the dispenser can emit a bad smell during cycles. | Sometimes | Easy | Rinse aid dispenser |
| Hard Water Deposits Mineral buildup can cause a musty smell and affect cleaning efficiency. | Sometimes | Easy–Medium | Descaler or vinegar |
| Faulty Door Seal A damaged seal can trap water and food particles, causing odor. | Rare | Medium | Door seal replacement |
Parts matching
If parts need replacement, look for these common dishwasher components:
- Dishwasher filter
- Rinse aid dispenser
- Drain hose
- Door seal
- Dishwasher cleaner or descaler
- Vinegar (for DIY cleaning)
Check your dishwasher’s manual for specific part numbers and compatibility before purchasing replacements.
When to call a professional
- Odor persists after multiple cleaning attempts
- You notice a foul smell from the drain pipe or garbage disposal connection
- Dishwasher leaks water or makes unusual noises during cleaning
- You suspect a broken pump or internal component
- Mold or mildew is extensive and difficult to clean
- You are unsure about electrical or plumbing repairs
FAQ
How often should I clean my dishwasher?
Clean the filter and interior every 1–2 months to prevent odors. Use a vinegar or dishwasher cleaner cycle monthly.
Can I use bleach to clean my dishwasher?
Avoid using bleach as it can damage rubber seals and leave harmful residues. Use vinegar or a dishwasher cleaner instead.
Why does my dishwasher smell like rotten eggs?
A rotten egg smell often indicates a bacterial buildup in the drain or filter. Thoroughly clean these areas and run a vinegar cycle.
Is it normal for my dishwasher to have a slight smell after a cycle?
A mild odor is normal if the dishwasher is drying properly. A strong or lingering smell indicates a cleaning issue.
Can hard water cause a bad smell in the dishwasher?
Yes, hard water deposits can lead to a musty smell. Use a water softener or descaler to address this issue.