The short answer
A leaking Black+Decker WQP dishwasher is a timing puzzle more than a mechanical one. Dry the floor, run a cycle, and note the minute the water arrives — fill, wash or drain. That single observation ranks the causes below far better than any amount of looking underneath. Settle the build before the ranking applies: these models divide on an air gap cap on the worktop.
What you observe on these models
- A puddle at the front, under the door — Check whether the water is soapy, which points at the wash rather than the fill.
- A drift of bubbles on the floor — This is a cause rather than a symptom and it clears with rinses.
- A drip that appears only while the machine is filling — It is the only leak that is under mains pressure.
- Water that arrives when the machine drains — Often shows up under the sink rather than under the machine.
- Wetness behind rather than in front — A supply or drain connection rather than the door — the door cannot wet the back.
- NEAR MISS — droplets on the worktop edge at the vent — That is condensation from the drying vent and it is normal on many builds.
Most likely first on this family
- Over-sudsing from the wrong detergent or too much of it — It also explains a leak that appeared for the first time after someone washed a pan by hand in the tub.
- The drain hose or its connections — It rises sharply if anything has been done under the sink recently.
- 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 door seal, the door alignment or the detergent-cup surround — It sits in the middle of the list — common enough to check, cheap enough that finding it early is worth the minute it takes.
- 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.
The order that finds it fastest
- Dry everything, then run a cycle and watch the clock — Fill, wash or drain — those three answers point at three different parts, and nothing else narrows it so quickly.
- Rule out suds before anything else — Hand dish soap in the tub foams enormously and pushes water straight past the door.
- Inspect and clean the seal and the door edge — Hardened, flattened or food-crusted sections leak in one place, repeatedly.
- Check the machine is level in its opening — A spirit level across the door opening settles it.
- Dry and inspect the supply and drain connections — This is where a leak that is not at the door usually lives.
Before you open anything
Safety
Power off at the breaker before any panel is removed — unplug it where the plug is reachable, because a capacitor can hold a charge after the power is off. Never wedge or defeat the door latch to watch a cycle run.
Where the owner job ends
The line is the kick plate. In front of it: the gasket, the door fit, the detergent, the visible connections. Behind it: the sump, the pump seal, the inlet valve and the wiring that runs beside all three. A dishwasher that leaks and trips the breaker should be switched off and booked the same day rather than run again.
Other faults covered for the WQP models
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
