The short answer
On the DWS family a leak splits into two classes: one you can see at the door, and one that starts behind the machine and arrives at the toe kick. Separating those two before anything is dismantled is what this page adds to the brand-generic article.
What you observe
- Damp at the back of the cabinet only — A supply or drain connection, and it will be wet when the machine is idle if it is the supply side.
- Suds spilling from the door — Wrong detergent or a rinse-aid overdose, and it leaks past a seal that is otherwise fine.
- Water only on heavy or long cycles — A leak that needs heat or a full fill to show, which points at the door seal or an overfill.
- NEAR MISS - water only when the sink is used — That is a plumbing fault at the shared waste, not a dishwasher fault.
Causes, most likely first on DWS
- Drain hose connection or a split hose — Ranked first on the DWS family: the drain hose is clipped high and bent hard where it leaves the cabinet, and years of that produce a split at exactly the bend. The table above is one platform, so a weakness in the wash path shows on every code in it and not on a single variant. This moves above door seal hardened, displaced or dirty, which leads the brand-generic order, because the family spans several sizes on one platform and it is the shared parts that wear.
- Supply connection at the inlet valve or the stop tap — Second: made up behind the machine in a tight recess, so a slow weep runs down the cabinet floor and shows at the front.
- Door seal hardened, displaced or dirty — Third: the door seal runs a long way round a tall opening, and the bottom corners are where it lifts, hardens and lets water past first.
- Tub, sump gasket or heater seal — Fourth: last: a cracked tub or a failed sump gasket is a service finding and is reached only once everything above it has been cleared.
- Overfill from a stuck inlet valve or float — Last: an overfill shows as a leak at the door bottom and is easy to mistake for a seal fault.
Check in this order, and why
- Dry everything, run a cycle and watch where it wets first — The order in which two points get wet tells you which is the source and which is the path.
- Check the machine is level front to back — A machine tilted forward holds water against the door bottom instead of returning it to the sump.
- Look under the toe kick with a torch while the cycle runs — It shows whether water is arriving from behind or running down the door.
- Look at the detergent and the rinse-aid setting — It costs nothing, and it is the whole answer when the leak is foam rather than water.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Shut the stop tap before disturbing any supply fitting, and leave the door interlock and its wiring exactly as the factory ran them: that interlock is what keeps the machine from spraying with the door open.
When to call a technician
Isolate the machine at the stop tap the moment you see a supply-side leak. A seal or a detergent fault is owner work; a weeping union behind a built-in machine means pulling it out with the water off, and that is where most owners should stop.
Other DWS pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
