The short answer
On Black+Decker BPD models a dishwasher that has stopped cleaning is nearly always failing to get water where it needs to go, not failing to wash: blocked spray jets, a filter full of debris, or a load packed so the arms cannot turn. Which of those leads depends on whether your machine has a lift-out filter or a grinder. The first three checks below take a few minutes and no tools. On the BPD models the check that decides the order below is which build you have: a machine plumbed in under the counter, or not.
What you observe on these models
- Gritty deposits left on plates and in cups — Debris is being recirculated rather than filtered out, which points at the filter or the sump.
- A cloudy film on glassware — A film you can rub off is deposit; one you cannot is etching and is permanent.
- The cup has opened but the tablet has not dissolved — This single observation rules several causes in and out.
- The bottom rack is clean and the top rack is not — Swap a few items between racks to confirm the pattern.
- The spray arms do not spin freely by hand — Check with the racks loaded the way you normally load them.
- NEAR MISS — dishes come out clean but wet — That is a drying and rinse-aid question rather than a wash fault, and a different page.
Causes, ranked for the BPD build
- The spray arms are blocked, clogged or held by the load — It leads on every build in this class, because the jets are small by design and the first thing that happens to a machine in hard water is that half of them close up.
- The filter or the sump is loaded with debris — Second on filter builds and effectively absent on grinder builds, which is why the first thing to establish is which one you have.
- The water arriving is not hot enough — It also explains the film-and-undissolved-detergent pattern better than anything mechanical does.
- 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
- Spin both spray arms by hand — First, because it costs nothing and it explains most complaints on this class.
- 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 — The machine fills with whatever is in the pipe, so a long cold run at the start of the cycle wastes the wash.
- Check the detergent cup opens and empties — A tablet still sitting there names either the cup or the water temperature.
- Reload the racks and run the same load again — Nested bowls and overlapping plates shadow each other, and no machine cleans through another plate.
Power off first
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 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 BPD models
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
