Washer Smells Musty (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 musty washer is usually caused by mold or mildew buildup. Clean the drum, gasket, and drain pump to eliminate odors. Use a washing machine cleaner or white vinegar for a deep clean.

Confirm the symptom

Notice a musty or moldy smell from the washer
Smell is strongest after the washer sits idle
Smell lingers even after running a cleaning cycle

Tools and prep

Rubber gloves
White vinegar or commercial washing machine cleaner
Old towel or cloth
Soft brush or sponge
Microfiber cloth
Screwdriver (if needed for drain pump access)

Step-by-step troubleshooting

Turn Off and Unplug Washer
Do: Unplug the washer or turn off the circuit breaker to ensure safety.
Observe: Washer is powered off and cannot start unexpectedly.
Means: Prevents electrical hazards during cleaning.
Next: Clean the drum and gasket
Clean the Drum and Gasket
Do: Wipe the interior drum and rubber gasket with a mixture of water and white vinegar or use a commercial cleaner.
Observe: Visible mold or mildew begins to dissolve.
Means: Removes surface mold and mildew causing the odor.
Next: Scrub the drain pump filter
Scrub the Drain Pump Filter
Do: Locate and remove the drain pump filter (consult your manual for location). Clean it with a brush and vinegar or cleaner.
Observe: Filter is free of debris and grime.
Means: Clears blockages that trap moisture and cause odors.
Next: Run a cleaning cycle
Run a Cleaning Cycle
Do: Use a washing machine cleaner or add 2 cups of white vinegar to a hot water cycle. Run the cycle without any laundry.
Observe: Cycle completes without unusual noises or smells.
Means: Deep cleans the internal components and sanitizes the system.
Next: Dry the interior
Dry the Interior
Do: Leave the washer door and detergent drawer open to air dry after cleaning.
Observe: Interior is dry and no longer smells musty.
Means: Prevents future mold and mildew growth.
Next: Final inspection
Final Inspection
Do: Check all cleaned areas for remaining odors or dampness.
Observe: No lingering musty smell and all parts are dry.
Means: Confirms the odor issue is resolved.
Next: Done

Common causes

Cause	Likelihood	Difficulty	Part often needed
Mold and Mildew in the Drum Moisture trapped after cycles creates a breeding ground for mold.	Common	Easy	Washing machine cleaner
Clogged Drain Pump Filter Debris and lint in the filter trap moisture and cause odors.	Common	Easy–Medium	Drain pump filter (if replacement is needed)
Damp Detergent Drawer Residual water in the drawer promotes mold growth.	Sometimes	Easy	Detergent drawer (if replacement is needed)
Blocked Vent Hose (Front-Loaders) A clogged vent hose restricts airflow and traps moisture.	Sometimes	Medium	Vent hose (if replacement is needed)
Old or Stale Water in the Tub Standing water in the tub can develop odors over time.	Rare	Medium	Water inlet valve (if not draining properly)
Worn Seals or Gaskets Damaged seals can trap water and cause mold.	Rare	Hard	Rubber gasket or seal

Parts matching

If cleaning doesn't resolve the odor, consider replacing these parts:

Drain pump filter – if clogged and difficult to clean
Detergent drawer – if mold persists in the drawer
Rubber gasket – if damaged and trapping moisture
Vent hose – if blocked in front-load washers
Water inlet valve – if water isn't draining properly

Purchase parts specific to your washer model for compatibility.

When to call a professional

The musty smell persists after multiple cleaning attempts
You notice a foul odor coming from the drain pump that won't clear
The washer makes unusual noises or doesn't drain properly after cleaning
Mold or mildew is recurring despite regular cleaning

FAQ

How often should I clean my washer to prevent musty smells?

Clean your washer once a month using a commercial cleaner or white vinegar to prevent mold and mildew buildup.

Can I use bleach instead of vinegar to clean my washer?

Yes, but use it sparingly and ensure your washer is compatible. Bleach can be harsh on rubber components over time.

Why does my washer smell even after I clean it?

Persistent odors may indicate a deeper issue like a clogged drain pump or damaged seals that need professional attention.

Is it normal for my washer to smell after sitting for a few days?

No, a musty smell after sitting is a sign of mold or mildew and should be addressed promptly.

How do I clean the detergent dispenser to remove mold?

Remove the dispenser, soak it in a vinegar-water solution, and scrub with a soft brush to remove mold.