The short answer
Dirty dishes out of a Black+Decker BDW dishwasher usually mean one of three things — the arms are not reaching, the water is not hot enough, or the detergent is not being released. On this family the arms come first, because the jets are the part that silts up and the part you can inspect in under a minute. What separates BDW units here is visible without a tool: a filter that twists out of the tub floor, or nothing of the sort on the other build.
What you observe on these models
- Sandy residue after a full cycle — It is often worse on the upturned items in the top rack.
- Glasses that come out dull rather than dirty — A water hardness and detergent reading rather than a mechanical one.
- Detergent still sitting in the dispenser at the end — Either the cup is blocked by a tall item or the water is not warm enough to dissolve it.
- One rack consistently worse than the other — Swap a few items between racks to confirm the pattern.
- An arm that catches or stops against the load — Check with the racks loaded the way you normally load them.
- NEAR MISS — clean but not dry — Nothing on this page will change how dry the load is.
Causes, ranked for the BDW build
- The water arriving is not hot enough — It climbs to the top where the machine is a long pipe run from the water heater, because the cycle fills with whatever is in the pipe at that moment. Running the tap hot at the sink before starting is the free version of the test.
- The filter or the sump is loaded with debris — Where there is a filter, this ranks high simply because it is maintenance that nothing reminds you to do.
- The spray arms are blocked, clogged or held by the load — It sits in the middle of the list — common enough to check, cheap enough that finding it early is worth the minute it takes.
- Detergent type, dosing or a blocked dispenser — Mid-list, but it moves to the top when the complaint is film rather than grit, and in hard-water areas generally.
- The wash pump, its impeller or the chopper — Last of the five, because everything above it is cheaper and far likelier, and because this is the only one that needs a technician.
Check in this order, and why
- Check the filter and sump for debris — On a filter build this is the maintenance nothing reminds you to do; on a grinder build there is nothing to lift.
- Run the kitchen tap hot before starting a cycle — This is the free test for the temperature cause.
- Check the detergent cup opens and empties — Make sure nothing tall is blocking the cup door when you load.
- Reload the racks and run the same load again — The cheapest experiment on the list.
Before you open anything
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.
Where the owner job ends
The condition is whether anything is left that you can reach from inside the tub. Arms, filter, loading, detergent and the temperature of the fill are all in there. The pump, the diverter and the heating circuit are underneath the tub, in a space where mains wiring and water share a housing, and that is a service call rather than an afternoon.
Other faults covered for the BDW models
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
