The answer, before the detail
Standing water in a Black+Decker BPD dishwasher at the end of a cycle is usually a blockage rather than a failed pump, and it is usually in the two places you can reach: the filter and sump inside, and the drain hose route under the sink. On this family the filter leads. A small amount of water always sitting in the sump, by contrast, is normal and is not what this page is about. 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 the owner actually sees
- A pool covering the tub floor when you open the door — Note whether it is clean or dirty water — dirty means it never left.
- Water backing up into the sink when the machine drains — The shared drain line beyond the machine is restricted rather than the machine itself.
- Noise from the plumbing rather than the machine — Air fighting its way past a restriction, usually in the hose route or the air gap.
- Stale water odour on opening — Water that is not leaving is water that is standing, and standing water in a warm tub smells.
- A partial drain that leaves a shallow layer — A restriction rather than a blockage — more typical of the hose route than of the sump.
- NEAR MISS — a film of water always in the sump recess — That is normal on most machines; it keeps the seal wet. It is not a drainage fault.
Most likely first on this family
- The filter and sump are blocked — It leads on filter builds, because everything the machine washes off has to pass this point and nothing tells you when it stops passing. Lifting the filter out takes seconds and settles the question.
- The drain hose is kinked, blocked or has lost its high loop — It ranks high because it is common, invisible and free to fix.
- The disposer knockout plug or the air gap is blocking the outlet — This is the top cause on a machine that has never drained since it was fitted, and it is not a fault at all — it is a plug that was never removed.
- The check valve or the drain path inside the machine — Mid-list: it explains water returning to the tub after a good drain, which is a different pattern from water that never left.
- The drain pump is jammed or has failed — Last, because every cause above it is reachable without tools and this one is not.
The order that finds it fastest
- Scoop the water out and look at the sump — Use a jug and a cloth, and watch for glass.
- Inspect the filter and the sump recess — A torch makes the difference between looking and seeing.
- Follow the drain hose under the sink — Second because it is the next part of the same path.
- Inspect where the hose joins the waste — An air gap comes apart by hand and blocks with the same debris as the filter.
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
Call when the filter, the hose route and the waste connection are all clear and the tub still holds water — that leaves the pump and the parts under the tub. Call sooner if you can hear the pump hum without moving water, or if there is glass in the sump: a fragment in the impeller is a common cause and a bad thing to fish for by hand.
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.
