What is going on across the STW line
When an Avanti STW washer leaves the drum full, work the drain path in the order the water travels: filter, pump, hose, standpipe. On a compact machine the filter is the first and by far the most likely restriction, and it is designed to be opened by the owner.
What this looks like in use
- Water comes back into the drum after it has emptied — On STW models, a drain hose without its required high loop siphons the water straight back in.
- The drum will not spin even when empty — On this family, that is a different fault — a drive, lid-proof or motor issue rather than the drain path.
- The load comes out soaking rather than damp — In the STW family, soaking clothes with an empty drum means a partial blockage, not a total one.
- It drains but very slowly — On the STW line, a partial restriction — a filter part-way full, or a hose sagging where debris collects.
- The machine sits at the same point in the cycle for a long time — On an STW model, many controls extend or repeat the drain step instead of reporting a fault.
- NEAR MISS — it drains fine but stops mid-cycle — Then the drain path is healthy and something else is halting the cycle; read the cycle-fault page.
What goes wrong here, most frequent first
- A blocked pump filter or coin trap — It leads because it is the one part of the drain path the maker intends the owner to open, and because most machines that will not drain have nothing else wrong.
- A kinked, crushed or badly routed drain hose — Pushed back against a wall, the hose folds; routed too high or too low, it siphons or will not lift. That ranking holds across the STW line.
- A standpipe or household waste that cannot take the flow — It belongs here because it is outside the appliance entirely and because a bucket of water poured into the standpipe tests it in seconds.
- A control or wiring fault at the pump circuit — It comes last because every mechanical cause above presents identically and costs almost nothing to eliminate. The STW models in the table below are no exception.
Where to start, and what follows
- Open the pump filter and empty it — On the STW line, this is the first and most productive check on the page, and it is designed to be done by hand.
- Follow the drain hose from the machine to the outlet — In the STW family, a hose crushed against a wall is the second commonest cause of the whole fault.
- Start a drain or spin and listen at the pump — Across the STW line, a hum with no flow is a jam; silence is a pump, a control or a fuse.
- Check the drain hose has a rise above the drum — Look at how the hose is clipped at the back, and whether it has been pushed flat against the wall.
Before you take any panel off
Safety
Isolate the washer at the plug or breaker before reaching into a pump or filter housing; a capacitor can stay charged after the power is off, and an impeller that starts while your fingers are in the housing is the injury this fault causes. Coins and wire from a pocket cut, so wear gloves.
Models in the STW family
Reference| Model number | Family key |
|---|---|
| STW16D0W | avanti:washer:stw |
| STW20D2P | avanti:washer:stw |
| STW30D0W | avanti:washer:stw |
Where the owner line falls
The owner line is the filter, the visible part of the pump, the hose and the household waste. Beyond that, call. A pump that hums against a blockage and a pump that is silent lead to different parts, so note which you have before the visit.
Other STW problems we cover
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
