There is a small door on the bottom front of most front loading washing machines. Many people have never opened it. Some do not know it is there.
Behind it is the drain pump filter, and it is the single most likely explanation for a machine that smells despite a clean gasket, drains slowly, or has started leaving clothes soaking wet at the end of a cycle.
What it is for
Water leaving the drum passes through a pump on its way to the drain. That pump has a small impeller, and anything solid that reaches it can jam it or damage it.
The filter sits in front of the pump and catches those solids. It is a protective part, and it is designed to be opened and emptied by the owner rather than by a technician.
The manual almost certainly says to clean it every few months. Almost nobody does.
What is in there
Coins, without fail. Hair, in quantity. Lint that never made it to the drain. Buttons, hair ties, small screws, pen caps, a great many bobby pins, and the occasional sock.
Also standing water, because the filter housing holds water by design.
And that combination, warm standing water plus organic material sitting in the dark for a year, is a very effective incubator. This is why the filter is such a common source of a smell that survives cleaning everything visible.
The symptoms
A musty smell with a clean gasket. The most common one. You cleaned everything you could see and the smell persists.
Slow draining, or water left in the drum at the end of a cycle.
Clothes coming out wetter than usual. If the machine cannot drain quickly it cannot spin properly, and the final extraction suffers.
An error code about draining. Most machines have one, and a blocked filter is the first thing to check before calling anyone.
A grinding or rattling noise during drain. Usually a coin sitting where it should not be.
The cycle taking longer than it used to. Machines with sensors will extend a cycle when drainage is slow.
How to clean it
Fifteen minutes, no tools beyond a towel and a shallow container.
Unplug the machine.
Put towels down and have a shallow pan ready. This is the step people skip and then regret. There is more water in there than you expect, sometimes a gallon, and it comes out onto the floor if you are not ready.
Open the access panel. Usually it pops off with a fingernail or a flat screwdriver at the edge.
Look for a small drain hose before you unscrew anything. Many machines have one tucked beside the filter with a cap on the end. Pull it out, hold it over the pan, and remove the cap to drain the water in a controlled way. Then recap it. This makes the whole job clean rather than messy.
Unscrew the filter, counterclockwise, slowly. More water will come.
Pull it out and clear it. Rinse it under a tap, use an old toothbrush on the mesh, and check the cavity it came out of by reaching in with a finger or a torch. The impeller is in there and should turn freely.
Screw it back in firmly and close the panel. Then run a short empty rinse and check underneath for leaks before doing a real load.
Every three months is the honest interval. Every month if you have pets or wash a lot of towels.
If your machine is a top loader
Most top loaders do not have a user-accessible filter, which people take to mean there is nothing to clean.
There usually is. Many have a filter under the agitator cap or beneath the drum cover, and most have a pump that can be reached from underneath by a technician. If a top loader is draining slowly, the cause is the same, it is just less accessible.
Check your manual for a lint filter location. Some older top loaders have one in the top rim of the drum that catches lint continuously and clogs solid.
The habits that keep it clear
Check pockets. Genuinely. Most of what ends up in a filter arrived in a pocket.
Use mesh bags for small items. Socks, underwear with hooks, anything with a drawstring. It keeps small things out of the pump and stops socks disappearing.
Shake pet hair off before washing rather than letting the machine deal with it. Hair is the material most likely to bind the filter into a solid mat.
Zip zippers and fasten hooks so they do not catch and pull threads that end up wrapped around the impeller.
Use less detergent. Residue in the drain path is what turns loose lint into a solid blockage.
Why this is a maintenance question rather than a cleaning one
Everything in this article is scheduled maintenance on a mechanical part. It is not glamorous and it is not optional, and the reason home machines fail early is that it does not happen.
Our machines and the store are cleaned daily, and commercial equipment gets its filters and pumps serviced on a schedule rather than when a fault appears. That is the practical difference between a machine that is maintained and one that is used until something breaks.
The machines at our self-service laundry on East Trinity Mills Road also extract at far higher speed than a household unit, which is worth knowing if your machine has started leaving clothes wet. A blocked drain path is the usual cause of poor extraction at home, and it is why the same load takes twice as long to dry.
Nou wash-dry-fold service covers everyday laundry if a machine is out of action.
The short version
The small panel at the bottom front of a front loader hides the drain pump filter, and it is the most likely source of a smell that survives cleaning the gasket. It holds standing water, hair, lint, and coins, in the dark, for however long it has been since anyone opened it. Clean it every three months, monthly with pets. Put towels down first and use the small drain hose beside it before unscrewing anything, because there is more water in there than you think. Check pockets, use mesh bags, and shake pet hair off before washing.
WaveMAX Carrollton is at 2760 E Trinity Mills Rd, easy to reach from Carrollton, Farmers Branch, and the surrounding area. If your machine is draining slowly or leaving clothes wet, call us at (214) 731-6575.