The short answer
Water on the floor around a DWDT dishwasher rarely comes from where it appears. The seal, the supply union and the drain hose are the three real candidates, and the order here differs from the brand-generic one because these are cabinet-fitted machines where a rear leak reaches the front before anything else does.
What you observe
- Suds spilling from the door — Wrong detergent or a rinse-aid overdose, and it leaks past a seal that is otherwise fine.
- Water appearing at the toe kick during a cycle — The floor of the cabinet channels everything forward, so the visible point is almost never the source.
- A stain on the cabinet floor with no water present — A historic or intermittent leak, and it usually means a fill or drain event rather than a constant seep.
- 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 DWDT
- Supply connection at the inlet valve or the stop tap — Ranked first on the DWDT family: the supply union is made up behind the machine in a space nobody looks into, so a weep runs along the cabinet floor and appears at the front. That is a family-level property rather than a model-level one, which is why it leads here and not on a page about one machine. This moves above door seal hardened, displaced or dirty, which leads the brand-generic order, because this family is a single build with fixed access points.
- Door seal hardened, displaced or dirty — Second: 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.
- Overfill from a stuck inlet valve or float — Third: an overfill puts water against the door bottom rather than into the sump, which looks like a seal fault and is not one.
- Drain hose connection or a split hose — Fourth: 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.
- Tub, sump gasket or heater seal — Last: last: a cracked tub or a failed sump gasket is a service finding and is reached only once everything above it has been cleared.
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 behind the machine with the cycle idle — Wet with the machine off is a supply-side fault; dry when idle and wet when running is drain or door.
- Run a finger around the whole door seal — Feel for a hard or displaced section and for debris sitting on the sealing face.
- 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
Isolate the machine at the breaker and shut the stop tap before any panel or fitting is disturbed. Broken glass in the sump is the injury that actually happens here, so lift debris with pliers and not with fingers.
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 DWDT pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
