The answer, before the detail
Dirty dishes out of a Black+Decker BCD 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. 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
- 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 film you can rub off is deposit; one you cannot is etching and is permanent.
- Detergent still sitting in the dispenser at the end — This single observation rules several causes in and out.
- The bottom rack is clean and the top rack is not — A rack-level split points at the arm feeding that rack or the feed tube behind it.
- An arm that catches or stops against the load — Check with the racks loaded the way you normally load them.
- NEAR MISS — dishes come out clean but wet — Nothing on this page will change how dry the load is.
Most likely first on this family
- 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. A stripe of clean dishes with dirty ones either side is this cause written out.
- 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.
- 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 water arriving is not hot enough — It also explains the film-and-undissolved-detergent pattern better than anything mechanical does.
- 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.
The order that finds it fastest
- 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.
- Check what temperature the fill actually gets — This is the free test for the temperature cause.
- Look at what is left in the dispenser at the end — Make sure nothing tall is blocking the cup door when you load.
- Take loading out of the question — The cheapest experiment on the list.
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.
When to call a technician
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 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.
