Washer Smells Like Rotten Eggs When Running (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 washer smelling like rotten eggs often indicates a problem with bacteria growth, usually due to moisture and lack of ventilation. Start by cleaning the washer with a specialized cleaner or white vinegar. If the smell persists, check the drain pump, hoses, and water supply for blockages or issues.

Confirm the symptom

Unpleasant rotten egg smell when the washer is running
Smell is strongest when the washer is in use
No visible leaks or water issues
Washer functions otherwise normally
Smell is not present when the washer is off

Tools and prep

Turn off power and water supply to the washer
Gather cleaning supplies (white vinegar, baking soda, specialized washer cleaner)
Have a flashlight for better visibility
Prepare a bucket and towels for any spills
Wear gloves and protective eyewear
Screwdriver (Phillips and flathead)
Pliers
Old toothbrush for scrubbing
New hoses or parts if needed

Step-by-step troubleshooting

Clean the Washer
Do: Run a cleaning cycle with white vinegar or a specialized washer cleaner.
Observe: Check if the smell persists after cleaning.
Means: Bacteria or mold growth is often the cause of the smell.
Next: If the smell persists, proceed to the next step.
Check the Drain Pump
Do: Locate and inspect the drain pump for blockages or debris.
Observe: Look for any signs of blockage or damage.
Means: A blocked or damaged drain pump can cause odors.
Next: If the drain pump is clear, move to the next step.
Inspect the Hoses
Do: Check the water inlet and drain hoses for clogs or damage.
Observe: Ensure there are no kinks or blockages in the hoses.
Means: Clogged hoses can harbor bacteria and cause odors.
Next: If the hoses are clear, proceed to the next step.
Clean the Water Supply
Do: Run hot water through the washer's water supply lines.
Observe: Check if the smell improves.
Means: Mineral buildup or bacteria in the water supply can cause odors.
Next: If the smell persists, check the next component.
Check the Drain Filter
Do: Locate and clean the drain filter.
Observe: Remove any debris or blockages.
Means: A clogged drain filter can cause unpleasant odors.
Next: If the smell is still present, consider the next step.
Inspect the Dispenser Drawer
Do: Remove and clean the detergent dispenser drawer.
Observe: Look for any residue or blockages.
Means: Residue in the dispenser can cause odors.
Next: If the smell continues, check the next component.
Check the Drain Pipe
Do: Inspect the drain pipe for blockages or damage.
Observe: Ensure the pipe is clear and properly connected.
Means: A blocked or damaged drain pipe can cause odors.
Next: If the problem persists, consider calling a professional.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Bacteria or Mold Growth Moisture and lack of ventilation create an ideal environment for bacteria and mold.	Common	Easy	Washer cleaner, white vinegar
Blocked Drain Pump Debris or blockages in the drain pump can cause odors.	Sometimes	Easy–Medium	None
Clogged Hoses Water inlet or drain hoses can harbor bacteria and cause smells.	Sometimes	Easy–Medium	New hoses if damaged
Mineral Buildup Minerals in the water supply can cause odors over time.	Sometimes	Easy	Washer cleaner, white vinegar
Clogged Drain Filter A blocked drain filter can lead to unpleasant odors.	Sometimes	Easy	None
Residue in Dispenser Drawer Detergent residue can build up and cause smells.	Sometimes	Easy	None
Blocked Drain Pipe A blocked or damaged drain pipe can cause odors.	Rare	Medium	None

Parts matching

If you need to replace any parts, ensure they are compatible with your washer model.

Washer cleaner or descaler
White vinegar
New drain pump
New water inlet hoses
New drain hoses
Drain filter
Drain pipe

Always check the manufacturer's guidelines for recommended parts and maintenance.

When to call a professional

If the smell persists after thorough cleaning and inspection
If you find significant damage to any components
If you are uncomfortable performing any of the steps
If the washer shows other signs of malfunction
If you suspect a gas leak (contact a professional immediately)

FAQ

Why does my washer smell like rotten eggs?

The smell is usually due to bacteria or mold growth caused by moisture and lack of ventilation. It can also be due to blockages in the drain pump, hoses, or drain filter.

How often should I clean my washer?

It's recommended to clean your washer every 30 washes or once a month to prevent odors and maintain performance.

Can I use bleach to clean my washer?

Bleach can be used, but it's generally better to use a specialized washer cleaner or white vinegar to avoid damaging the washer's components.

What if the smell comes back after cleaning?

If the smell returns, there may be a deeper issue such as a blocked drain pump or hoses. Inspect these components and consider calling a professional if needed.

How do I prevent odors in my washer?

Regularly clean your washer, leave the door open between uses to allow ventilation, and use the correct amount of detergent to prevent residue buildup.

Is it safe to use my washer if it smells like rotten eggs?

While it may not be harmful, the smell indicates a hygiene issue. It's best to address the problem promptly to ensure your washer is clean and functioning properly.