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A washer that smells is growing biofilm somewhere it stays warm, damp and soapy — the door seal, the drawer, the drum and the drain hose, in that order. A standing filter trap and sump is the first thing to suspect on a Criterion, because a value-tier build puts the cheap wearing parts — filters, hoses, seals, screens — in the path of everything the machine does, so they are where the fault usually is. Cleaning, hot maintenance washes and habit changes are entirely owner work; only a persistent smell after all of that needs a visit.
Signs that fit this page
- Laundry comes out smelling worse than it went in — The machine is transferring the odour to the load.
- Black or grey spotting around the door seal or drawer — Visible biofilm, which is the source rather than a symptom.
- A drain-like smell that comes and goes — More likely the standpipe or the drain hose than the machine.
- NEAR MISS — The smell is worst in one room but not from the machine — Check the standpipe trap before cleaning the washer again.
Causes, most likely first
- A standing filter trap and sump — Most likely here: a value-tier build puts the cheap wearing parts — filters, hoses, seals, screens — in the path of everything the machine does, so they are where the fault usually is. The trap keeps water permanently, and what is caught in it rots there between cleans.
- A clogged detergent drawer and housing — Second on the list: Softener gel sets in the siphon and the housing above the drawer, where it stays wet and out of sight.
- Biofilm in the door seal fold — Third on the list: The lower fold of a front-loader bellows holds water after every wash, and residue plus warmth makes it the most reliable source of odour on the machine. It sits here rather than higher because a value-tier build puts the cheap wearing parts — filters, hoses, seals, screens — in the path of everything the machine does, so they are where the fault usually is.
- Too much detergent or softener — Fourth on the list, and the least likely: Residue is food. Over-dosing leaves a film on the drum, the hoses and the drawer that feeds exactly what causes the smell. A value-tier build puts the cheap wearing parts — filters, hoses, seals, screens — in the path of everything the machine does, so they are where the fault usually is.
Check in this order, and why
- Open the filter and smell what comes out — A sour trap is both a smell source and a warning that the drain path is filling up. It goes first because it is the cheapest thing to rule out and it decides which half of this list you are in.
- Remove the drawer and look into the housing above it — A pink or black slime in the housing is a finding that explains a persistent smell.
- Fold the seal back and smell it directly — If the smell is strongest there, the rest of this page is secondary.
Do these, in this order
- Clean the trap and the filter housing, then refit squarely — Towels and a shallow tray first, and check the O-ring before it goes back.
Tools: tray, towelsAbout 25 min
- Wash the drawer and siphon cap in hot water and brush the housing — An old toothbrush reaches the jets in the housing roof where the water enters.
Tools: brushAbout 20 min
- Stop here if the next move needs a meter on live terminals — That is where an owner check ends and a service call begins.
What to do before a panel comes off
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Close the taps before any hose comes off, and never bypass a door or lid switch to run the machine open.
What needs a technician
Call only if the seal, drawer, filter and drum have all been cleaned, the dose has been corrected, hot maintenance washes have been run for several weeks and the smell persists — at that point something is holding water where it should not.
Other faults on this machine
What this page does not cover
This is the family-agnostic page for Criterion washers. There is no per-model page under this one today. Where one appears it is linked from this block and it is the page to trust for a specific cabinet. Deliberately not here: wiring colours, resistance values, torque figures and part numbers, which differ between families.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
