Dishwasher Smells Bad Between Washes (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

To eliminate bad odors in your dishwasher, clean the filter and interior, run a vinegar cycle, and ensure proper drainage. Regular maintenance prevents buildup.

Confirm the symptom

Notice a foul smell from the dishwasher when opening it
Smell persists even after a wash cycle
Odor worsens if the dishwasher isn't used regularly

Tools and prep

Rubber gloves
White vinegar or dishwasher cleaner
Soft brush or sponge
Microfiber cloth
Old towel
Toothpick or small brush
Turn off power to the dishwasher at the circuit breaker for safety

Step-by-step troubleshooting

Clean the Filter
Do: Remove the bottom filter and rinse it under running water. Use a soft brush to scrub away debris.
Observe: Filter is clogged with food particles and grime
Means: Clogged filter is trapping organic material and causing odors
Next: Clean the interior
Clean the Interior
Do: Wipe down the interior walls, door seal, and spray arms with a damp cloth. Use a toothpick to clear any clogs in the spray arm holes.
Observe: Interior has residue or standing water
Means: Residue and stagnant water promote bacterial growth
Next: Run a vinegar cycle
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: Vinegar neutralizes odors and dissolves mineral buildup
Means: Mineral deposits and mildew are contributing to the smell
Next: Check for drainage issues
Check for Drainage Issues
Do: Inspect the drain hose for kinks or blockages. Ensure the air gap (if present) is clean and unobstructed.
Observe: Drain hose is clogged or kinked
Means: Poor drainage causes water to stagnate and smell
Next: Inspect the drain pump
Inspect the Drain Pump
Do: Listen for unusual noises when the dishwasher drains. Check for debris in the pump area (consult your manual for location).
Observe: Pump is noisy or not draining properly
Means: A faulty or clogged drain pump is causing water to remain in the dishwasher
Next: Final inspection
Final Inspection
Do: Ensure the dishwasher is drying properly after cycles. Check for any remaining damp areas or odors.
Observe: Dishwasher is dry and odor-free
Means: Problem resolved through cleaning and maintenance
Next: Complete

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Filter Food particles and grime trap moisture, promoting bacterial growth	Common	Easy	Dishwasher filter
Stale Water and Residue Standing water and detergent residue create a breeding ground for bacteria	Common	Easy	Dishwasher cleaner
Poor Drainage Blocked or kinked drain hose prevents proper water removal	Sometimes	Easy–Medium	Drain hose
Faulty Drain Pump A malfunctioning pump leaves water trapped in the dishwasher	Sometimes	Medium	Drain pump
Lack of Ventilation Inadequate drying causes dampness and mold	Rare	Medium	Ventilation system
Hard Water Deposits Mineral buildup fosters bacterial growth and bad odors	Sometimes	Easy	Water softener or dishwasher cleaner

Parts matching

Common parts needed to fix a smelly dishwasher:

Dishwasher filter (replace if damaged or excessively clogged)
Dishwasher cleaner (for vinegar or commercial descaling solutions)
Drain hose (replace if kinked or damaged)
Drain pump (replace if faulty)
Water softener (optional, for hard water areas)

Always check your dishwasher’s manual for recommended parts and compatibility before purchasing replacements.

When to call a professional

Persistent foul smell after multiple cleaning attempts
Dishwasher fails to drain properly despite clearing the hose
Unusual noises or error codes appear during operation
You suspect a damaged drain pump or internal component
You are unsure about disassembling parts or working with electrical components

FAQ

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 commercial dishwasher cleaner instead.

How often should I clean my dishwasher filter?

Clean the filter at least once a month to prevent buildup and odors.

Why does my dishwasher smell like rotten eggs?

A rotten egg smell often indicates bacterial growth due to stagnant water or a faulty drain pump.

Can hard water cause a smelly dishwasher?

Yes, hard water minerals can build up and trap bacteria, leading to odors. Use a water softener or descaling solution to help.

Is it normal for my dishwasher to smell after being unused for days?

A mild odor is normal, but a strong or persistent smell indicates a cleaning or drainage issue.