The short answer
Standing water in the base of a DW dishwasher means the machine could not move what was in it within the time the cycle allows. That is a restriction far more often than a pump failure, which is why the sump comes first here.
What you observe
- The pump can be heard running with nothing leaving — A blockage rather than an electrical fault. The pump has power and is working against something.
- Food debris redeposited on the load — The machine is washing with water it should have got rid of, which is what a partly blocked drain produces.
- Nothing audible at the drain step at all — Points past the filter at the pump or its supply, which is the other half of this list.
- Water standing in the base at the end of every cycle — The plainest form of the fault. Some water in the sump is normal on many machines; a covered base is not.
Causes, most likely first
- A filter and sump packed with debris — First on this family and it is not close. Everything the load lets go ends here, the filter is designed to be opened by hand, and a machine that has never had it cleaned will eventually stop draining whatever else is healthy.
- A kinked or crushed drain hose — Second. The hose runs in a tight space behind or beside the machine, and pushing the unit home folds it.
- Excess detergent and suds — Suds ahead of a pump reduce what it can move. On a compact machine the dose margin is small and a heavy hand shows up as a slow drain.
- Debris wrapped around the pump impeller — Glass, a label or a fruit stone past the filter will lock or foul the impeller. The tell is a pump audible against a load it cannot shift.
Check in this order
- Start a drain and listen for the pump — Straining against a blockage and doing nothing at all are two different halves of this list, and this split is free.
- Pull the machine forward and follow the drain hose end to end — Look for a fold behind the cabinet and a crush point where the unit was pushed home.
- Run the sink and watch the shared waste while the machine drains — Settles whether the restriction is the appliance or the plumbing before any part is bought.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. The heating element sits in the base and stays hot after a cycle, so let the machine stand before working in the sump.
Models in the DW family — The models this page covers, as the product spine lists them. The family spans a long model list, and the ranking below is what holds across all of it.
Reference| Model number | Family key |
|---|---|
| DW 25502 * | blomberg:dishwasher:dw |
| DW 25502 ** | blomberg:dishwasher:dw |
| DW 51600 **** | blomberg:dishwasher:dw |
| DW 52600 **** | blomberg:dishwasher:dw |
| DW 55502 * | blomberg:dishwasher:dw |
| DW 55502 ** | blomberg:dishwasher:dw |
| DW 55502 *** | blomberg:dishwasher:dw |
| DW25502* | blomberg:dishwasher:dw |
| DW25502** | blomberg:dishwasher:dw |
| DW55502* | blomberg:dishwasher:dw |
| DW55502** | blomberg:dishwasher:dw |
| DW55502*** | blomberg:dishwasher:dw |
When to call
Call when the filter and sump are clean, the hose is clear and properly routed, the waste connection runs freely and the machine still holds water. At that point the fault is the pump, its supply or the check valve, and all of them are behind the base panel.
Other faults on this family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
