The short answer
A leak from the BS family is usually the door seal or the supply connection rather than the tub itself, and on a built-in machine the water travels under the cabinet before it shows. The brand-generic page treats the door seal first; on this platform the fill and drain connections behind the machine deserve equal billing, because they leak out of sight.
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.
- 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 BS
- Door seal hardened, displaced or dirty — Ranked first on the BS family: a heavy professional door is held by a stiff spring, and a seal that has taken a set no longer conforms to it. The order below follows what the cabinet lets you reach, which on this family is decided once for every model in the table. What moves against the brand-generic order is lower down: drain hose connection or a split hose sits above overfill from a stuck inlet valve or float here, because this family is a single build with fixed access points.
- Supply connection at the inlet valve or the stop tap — Second: the supply is usually a long run under cabinetry, and the union takes the strain every time the machine moves.
- Drain hose connection or a split hose — Third: the hose run is long on these installations and takes a hard bend where it leaves the cabinet.
- Overfill from a stuck inlet valve or float — Fourth: a valve that seeps past when idle fills the tub slowly overnight and spills on the next door opening.
- Tub, sump gasket or heater seal — Last: last, but the pro-format machines have a larger sump gasket that is the one to check when everything above is dry.
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.
- 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.
- 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 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. Treat broken glass in the sump as the real hazard here: bail the water out and lift debris with pliers rather than fingers, and leave the door interlock exactly as it is.
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 BS pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
