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Cycle faults on the WAT line split cleanly by where the machine stops. This page works through the gates in the order the machine itself does, because diagnosing them out of order means testing components the cycle never reached.
What you observe
- The display shows a fault and the machine stops immediately — The control has detected the failed condition itself; read what the machine says before overriding it.
- NEAR MISS - the cycle takes much longer than the label says — Programme times are nominal and adapt to conditions. A long cycle is not a stalled cycle.
- The cycle finishes but the drum is still full of water — A drain gate that was never satisfied, which is why the door stays locked afterwards.
- The programme time stops counting down and stays put — The machine is waiting at a step. Where the timer froze is the most useful single clue you have.
- The time remaining goes up instead of down — Normal adaptive behaviour when the fill is slow or the load is unbalanced, not a fault on its own.
Ranked causes for these models
- Pressure or level sensing reading wrong — The machine acts on a level that is not true, so it either never fills enough or believes it is already full.
- Drain blocked at the filter or the hose — Second, and the reason so many stalled cycles end with a full drum and a locked door: no drain, no progress, no release.
- Restricted fill: taps part-closed or inlet filters blocked — First on this family because the machine will not proceed until it has its water, and a partly open tap produces exactly this stall.
- Control board or wiring fault — Last, because every cause above produces the same stall for far less money, and because a board is diagnosed by elimination rather than by inspection.
Working the fault in order
- Check the drain hose height and that it is not pushed deep into the standpipe — An installation fault rather than a component fault, and one that produces an intermittent stall that looks electrical.
- Open the drain filter and clear it — Do this early whenever the drum is holding water: it is both the test and the repair for the second-ranked cause.
- Watch the fill rate with the drum empty — A fill that trickles is a restriction upstream, and seeing it removes the guesswork about whether the water is arriving.
- Run the shortest programme available with an empty drum — Removes the load and the heating variables at once and shows whether the basic sequence can complete at all.
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.
Models in the WAT family
Reference| Model number | Family key |
|---|---|
| WAT28400UC | bosch:washer:wat |
| WAT28401UC | bosch:washer:wat |
| WAT28402UC | bosch:washer:wat |
Where the owner fix ends
Call once the owner-side checks are clean, or the moment the fault points at the bearings, the motor or the control board. Those need the machine stripped or a meter on a live circuit, and neither is a kitchen job.
Related faults on these models
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