The answer, before the detail
With a Black+Decker BCD dishwasher the most useful thing you can record is when the water appears, because each source leaks at its own moment: a door seal leaks during the wash, a supply fitting drips whether the machine runs or not, and a sump or hose leaks at the drain. On this family the door and the detergent-cup area lead. Suds on the floor are their own cause and the easiest to cure. On the BCD models the check that decides the order below is which build you have: a filter that twists out of the tub floor, or not.
What the owner actually sees
- Water appearing along the door line — Check whether the water is soapy, which points at the wash rather than the fill.
- A drift of bubbles on the floor — Wrong detergent, too much of it, or something in the tub that foams — hand dish soap is the usual culprit.
- Water at the start of the cycle only — It is the only leak that is under mains pressure.
- Water that arrives when the machine drains — The drain hose or its connections, which only carry water for part of the cycle.
- Water from the side or the back of the cabinet — A supply or drain connection rather than the door — the door cannot wet the back.
- NEAR MISS — steam rather than water — That is condensation from the drying vent and it is normal on many builds.
Causes, ranked for the BCD build
- The door seal, the door alignment or the detergent-cup surround — It ranks first anywhere the puddle is at the front, which is where most dishwasher puddles are.
- Over-sudsing from the wrong detergent or too much of it — Ranked immediately after the door because it is the single most common one-off cause, and because it is free to prove and free to fix.
- The inlet valve, the supply fitting or the filter connection — This is the leak that does not wait for a cycle, which is why it is ranked here: mains pressure does not stop when the machine does.
- The drain hose or its connections — Mid-list and easy to place, because it only leaks while the machine drains and leaves the rest of the cycle dry.
- The sump, the pump seal or a tub fitting under the tub floor — Last of the five, because confirming it means getting under the machine and everything above it does not.
Check in this order, and why
- Inspect and clean the seal and the door edge — Hardened, flattened or food-crusted sections leak in one place, repeatedly.
- Look at how the door meets the cabinet — A machine that has settled leans its water to one corner and the door no longer matches the tub.
- Check under the sink with a torch — Dry them completely so that any new water is unambiguous, and come back in an hour.
Power off first
Safety
Switch the machine off at its breaker before reaching behind the kick plate or the door panel — water and mains wiring share the same small space in a dishwasher, and a capacitor can hold a charge after the power is off. Leave the door latch and its switch exactly as they are: the machine is meant to stop the moment the door opens.
When to call a technician
Call when the leak is timed to fill or to drain and the connections you can reach are dry, and call at once if water is appearing from the centre underneath the machine. The condition is whether the fix is a clean, a clip or a foot — those are owner work — or a seal, a valve or a pump, which are not.
Other faults covered for the BCD models
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
