The short answer
A leaking Black+Decker countertop dishwasher is usually leaking at the tap adapter or the drain hose rather than at the tub, because those are the only connections and they are remade constantly. Note whether the water appears while filling, during the wash, or at drain, because that identifies the joint straight away.
What you observe
- Water at the tap while the machine fills — The adapter or its washer is not sealing.
- Water at the sink or worktop during the drain — The drain hose has slipped out of its outlet.
- Water under the machine during the wash — The door seal or something inside the tub.
- NEAR MISS — water left in the tub at the end — That is a drainage fault rather than a leak.
Causes, most likely first on this brand
- The tap adapter or its washer — First on this platform because the connection is made and unmade constantly. A hardened washer or an adapter cross-threaded onto a tap it does not quite fit weeps the whole time the tap is open.
- The drain hose leaving its outlet — Second, and often not a machine fault at all: the hose is stiff, the pump pushes it at the start of the drain, and an unsecured hose flips out of the sink.
- The door seal — Third. A countertop door is small and its seal is easily held off by a trapped label or a smear of grease, and the leak then appears under the front edge.
- The tub, pump housing or an internal hose — Last, and the only group needing the machine opened. On a countertop appliance that is usually a replacement decision rather than a repair.
Check in this order, and why
- Note when the water appears in the cycle — Fill, wash or drain — each points at a different connection.
- Dry everything and run a fill while watching — On a countertop machine you can see every joint at once.
- Secure the drain hose and repeat — This resolves the most common worktop-water case outright.
- Only then suspect something internal — That means opening a small sealed appliance.
What an owner can safely check
- Close the tap and unplug the machine — Do this before inspecting anything.
About 5 min
- Check and replace the adapter washer — A flat, hard or missing washer is the commonest leak of all.
Tools: pliers, new washerAbout 15 min
- Re-fit the adapter squarely on clean threads — Hand-tight on the right adapter; force will not seal a mismatch.
About 10 min
- Secure the drain hose at its outlet — Clip or tie it so the pump's first surge cannot flip it out.
Tools: cable tieAbout 10 min
- Clean the door seal and the door edge — Remove grease and any trapped label, then dry it.
Tools: warm water, clothAbout 15 min
Before you open anything
Safety
Close the tap and unplug the machine before investigating a leak — it sits on a worktop beside outlets and a kettle, which makes water a bigger hazard here than under a cabinet. A capacitor can hold a charge after the power is off, and the element stays hot after a cycle. Never leave a countertop machine connected to a tap unattended, because a hose that lets go does not stop.
When to call a technician
Call, or consider replacement, when the adapter, the hose and the door seal are all sound and water still appears from under the machine. On a countertop appliance an internal leak often costs more to repair than the machine is worth, so ask first. Switch the circuit off immediately if water has reached an outlet or the mains lead.
Nearest pages of this class
What this page does not cover
This page covers Black+Decker countertop dishwashers as a class rather than one model line. Deliberately absent here: adapter thread sizes, hose dimensions, door seal part identifiers and tank capacities, which differ by family and belong on the family or model page.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
