What does Speed Queen Washer Smells Like Mildew - Causes & Fix mean?

Usually caused by detergent residue and trapped moisture. Clean the dispenser, run a hot cleaning cycle, and leave the door open between loads.

How do I fix Speed Queen Washer Smells Like Mildew - Causes & Fix?

Work through the step-by-step fix below. Start with the quick reset and the most common cause, then check the specific part this guide points to. Most fixes need only basic hand tools and the right replacement part.

Can I keep using my appliance with this error showing?

Usually not. These appliances show this error when a part or safety circuit is out of range, so running it can stop the cycle or make the problem worse. Diagnose and clear the error before normal use.

What part is most commonly replaced for Speed Queen Washer Smells Like Mildew - Causes & Fix?

The parts that most often fix Speed Queen Washer Smells Like Mildew - Causes & Fix are listed in the parts section of this guide. Match the part to your exact model and serial number before you buy.

Is Speed Queen Washer Smells Like Mildew - Causes & Fix a DIY repair or do I need a technician?

Many fixes are DIY-friendly with basic tools, such as door switches, drain pumps, water inlet valves, thermostats, heating elements, and filters. Sealed-system, refrigerant, gas, or high-voltage work should go to a licensed technician for safety.

Speed Queen Washer Smells Like Mildew - Causes & Fix

Speed Queen Washer Smells Like Mildew — What’s Happening

A Speed Queen washer that smells like mildew is not indicating a fault code. It’s an odor complaint caused by mildew, mold, or bacteria buildup inside the machine. The smell develops when moisture, detergent residue, or organic material remains in the tub, dispenser, gasket, or drain path between cycles.

Common sources include using too much detergent, leaving wet clothes in the drum after the cycle finishes, a dirty detergent drawer, or trapped moisture in the door gasket on front-load models. On top-load machines, residue can collect around the agitator or under the agitator cap. If the model has a drain pump filter, debris or standing water there can also contribute to the odor.

Jump to Fix

Most Likely Causes

Too much detergent or wrong detergent type Excess detergent or non-HE detergent leaves a soapy film that traps moisture and grows mildew over time.
Leaving wet clothes in the washer Damp laundry left in the drum after the cycle creates a warm, moist environment where mold and bacteria thrive.
Dirty detergent dispenser or drawer Detergent and fabric softener residue build up in the dispenser, creating slime and odor that transfer to laundry.
Moisture trapped in the door gasket or seal (front-load) The rubber door gasket on front-load models collects water, lint, and debris in its folds, leading to visible mildew and smell.
Residue around the agitator or agitator cap (top-load) Detergent and fabric fibers collect under the agitator cap or around the agitator base, where they sit wet and develop odor.
Clogged or dirty drain pump filter On models with a serviceable drain filter, trapped debris and standing water in the filter housing can smell and spread odor through the tub.
Lid or door kept closed between cycles Closing the washer between uses traps humidity inside the drum and prevents air circulation, encouraging mildew growth.

How to Diagnose and Fix

Open the washer and sniff the drum, dispenser drawer, door gasket (front-load), and agitator area (top-load) to locate the strongest odor source.
Remove the detergent dispenser drawer fully and inspect it for slime, residue, or visible mold.
Wash the dispenser drawer and housing cavity with warm water and mild soap or a vinegar solution, then dry completely before reinstalling.
On front-load models, pull back the door gasket folds and wipe the entire seal with a damp cloth, checking for trapped lint, coins, or slimy buildup.
On top-load models with an agitator, remove the agitator cap if possible and inspect the area underneath for detergent residue or debris.
If the model has a drain pump filter (usually behind a small panel at the lower front), open the panel, place a shallow pan underneath, unscrew the filter slowly, and clean out any debris or standing water.
Run a hot cleaning cycle using a washer cleaner product or the manufacturer-recommended Clean Washer cycle to flush residue from the tub and internal hoses.
After cleaning, leave the washer lid or door open between loads and advise removing wet laundry promptly to prevent future odor.

Parts You Might Need

Part	Notes
Detergent dispenser drawer	Amazon \| Replace if cracked or if residue cannot be fully cleaned out.
Door gasket or door seal (front-load)	Amazon \| Replace if the rubber is torn, permanently stained with mold, or no longer seals properly.
Washer cleaner tablets or powder	Amazon \| Use a product approved for your Speed Queen model to clean the tub and internal components.

If your appliance also shows a code on the display, these match this problem:

When to Call a Pro

If the odor persists after cleaning the dispenser, gasket, agitator, and drain filter and running multiple hot cleaning cycles, call a technician. A pro can disassemble the cabinet to inspect hidden areas like the outer tub, sump hose, and drain pump housing for trapped debris or standing water. If the door gasket is damaged or the drain pump filter housing is cracked and leaking, a technician can replace those parts correctly and check for any underlying drainage or circulation faults.