The answer before the explanation
The WAN designation covers all five models in the table below. They share a service layout, which is why a fault found on one model turns up on its siblings in much the same order and is checked in the same sequence.
The observable tells
- A grinding noise only when the machine drains — Grit or a coin at the pump impeller. It routes to the drainage page, where the filter is the first thing opened.
- Knocking or banging during the spin — Balance and suspension rather than rotation. The noise page for these models starts with an empty spin test.
- The machine walks across the floor on spin — Feet, floor or load rather than a mechanism, and it is free to correct. The noise page covers levelling on these cabinets.
- The door will not open after a cycle — Correct behaviour over standing water rather than a lock fault. It routes to the drainage page, not to the no-start page.
Ranked causes for these models
- Coin or clip jamming the pump impeller — Found in the same look as the filter, and it makes a healthy pump sound exactly like a failed one.
- Motor or drive fault — A humming machine with a drum that will not turn, which is a different complaint from either a no-start or a noise.
- Drain hose kinked or badly seated in the standpipe — An installation fault that siphons or restricts, and that mimics a failed pump convincingly.
- Level or pressure sensing reading wrong — The machine acts on a water level that is not true, so it either never fills enough or believes it is already full.
Models in the WAN family
Reference| Model number | Family key |
|---|---|
| WAN24123AU | bosch:washer:wan |
| WAN24124AU | bosch:washer:wan |
| WAN24125AU | bosch:washer:wan |
| WAN28227AU | bosch:washer:wan |
| WAN28288AU | bosch:washer:wan |
Problem classes on this family, most reported first
General guidance| Problem class | Relative frequency on this family | What it means for the owner |
|---|---|---|
| Drain path: filter, impeller, hose | Leading cluster on this family | Owner-fixable on every model in this line |
| Load balance and suspension | Common | Free to test with an empty spin |
| Water in: taps, valves, drawer | Common | Mostly dosing and installation rather than parts |
| Door lock and start chain | Less common | Checked before any panel comes off |
| Heating and sensing | Less common | Programme-specific symptoms place it quickly |
| Rotating assembly: bearing, motor | Least common | Bench work, and the only expensive class here |
Based on: No measured denominator: the fact bundle for this family carries no component share, so this ordering is a technician ranking of problem classes and not a share of reports.
Safety first
Safety
Disconnect the plug before servicing, and put a towel and a shallow tray under the filter door. There is always water left in the sump even when the display says the cycle finished.
Where the owner fix ends
Stop and call if the machine has already been part-dismantled and will not go back to a known state. A half-assembled drum machine is the one situation where a service call actually gets cheaper by being made earlier.
Related faults on these models
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