The short answer
On the BGXDW family, a machine that finishes its cycle with water still in the bottom usually comes down to filter and sump blocked. The quickest way to place it is to lift the filter out and look under it with a torch. Three of the four causes below are owner-checkable in minutes; the last is where a service call starts. This page covers the BGXDW family, and the table below lists a single model, so nothing here has to be hedged across variants: the ranking is the ranking for that build. Where this departs from the brand-generic article is the order, not the list: the causes are the same, and the ranking below is the one that holds on these models.
What you observe
- Water backs up from the sink when the machine drains — That is the shared waste rather than the dishwasher, and it points at the sink trap or the disposal connection.
- It drained fine until the day a new sink or disposal went in — New plumbing is the single most common trigger for a dishwasher that suddenly will not empty.
- A small amount of clean water always remains — A shallow film in the sump is normal on many machines and keeps the seals wet; it is not a drainage fault.
- NEAR MISS: the machine will not start at all — No lights and no cycle belong on the will-not-start page rather than here.
Causes, most likely first
- Filter and sump blocked — The drain path starts at the sump, and anything that will not pass the filter sits in it: labels, seeds, a strip of foil, fragments of glass.
- Drain hose kinked, sagging or without a high loop — It ranks second because it explains almost every case that starts immediately after the machine or the sink cabinet was worked on.
- Waste connection blocked, or a disposal knockout left in — A sink trap or an air gap fitting that is full of grease produces the same complete stop on a machine that used to drain perfectly well.
- Check valve or pump failed — A check valve that sticks open lets waste water run back into the machine, so the sump refills after a drain that actually worked.
- Body: This page covers the BGXDW family, and the table below lists a single model, so nothing here has to be hedged across variants: the ranking is the ranking for that build. That order is the brand-generic order for this symptom, because nothing in how this line is built moves any of these causes past another.
Check in this order, and why
- Lift the filter out and look under it with a torch — Wear gloves. Broken glass is the single most common solid found in a dishwasher sump.
- Look at the hose route inside the sink cabinet — It should rise high under the worktop before dropping to the waste. A flat or crushed run is the fault.
- Look at where the hose joins the waste or the disposal — If the machine has never drained since installation, suspect the knockout plug before anything else.
- Body: The order follows the ranking above rather than the layout of the cabinet: each check either confirms the cause above it or removes it, and they are arranged so that the free checks come before anything that needs the unit moved or a panel off. With one configuration in the field, there is no variant that reorders these.
Before you open anything
Safety
Switch the dishwasher off at its breaker, or unplug it, before removing any panel or reaching into the sump. There is mains voltage at the heater terminals and at the pump, and the wiring runs through a damp space by design.
Models in the BGXDW family
Reference| Model number | Family key |
|---|---|
| BGX-DW01 | aooden:dishwasher:bgxdw |
When to call a technician
Call when the filter and sump are clear, the hose has its high loop, the waste connection is open and the machine still will not empty, or the moment you hear the pump hum with no water moving. Both of those need the machine out and the lower panel off, with power and water isolated.
Nearest pages of this class
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
