The short answer
A dishwasher that will not drain is telling you the water has nowhere to go. On the DUT line the two ends of that path — the filter at the bottom of the tub and the connection at the sink — are both owner-accessible, and between them they explain most standing-water complaints. Listen for the pump before assuming it has failed. The name covers a broad group of numbers, so the ranking below holds across the group while the parts stay specific to the machine in front of you.
What you observe on these models
- Dirty water appears in the tub between cycles — Waste water siphoning back down the hose, which is a hose-routing or check-valve fault rather than a pump fault.
- A rattle or a grinding note during the drain phase — Something hard in the impeller — glass, a fruit stone, a label — which stops the pump moving water long before it stops the motor turning.
- Drain works after the filter is cleaned, then fails again in a week — The filter is catching what a partly blocked sump is failing to pass; cleaning treats the symptom each time.
- Cycle stops early and the panel will not clear — Many machines abandon the cycle when the water has not gone, so a drain fault presents as a stalled cycle rather than as standing water.
- NEAR MISS — the tub is empty but dishes are wet — That is a drying complaint, not a drainage one, and it belongs on a different page.
Causes, most likely first on the DUT line
- Drain pump impeller jammed — First, and the cheapest to rule out. It ranks high because the fix is usually removal of an object rather than a part, and the check is behind one screw-in filter.
- Blocked filter and sump screen — Next most likely on these models. The filter is the one part of the drain path designed to catch things, so it is the first thing to fill; on a machine used daily it can choke in weeks rather than years.
- Kinked, looped or blocked drain hose — Third — worth checking once the two above are clean. A hose that has lost its high loop lets the waste siphon back, so the tub refills with dirty water while the pump is blameless.
Check in this order, and why
- Reach the impeller through the sump opening — With the power off, turn the impeller by hand. It should spin freely. A hard stop is an object, and the object is usually visible once the light is right.
- Take the filter out and look at the sump under it — Twist it free, rinse it, and put a hand into the well beneath — most of what blocks a drain is sitting there and comes out with a finger.
- Follow the drain hose from the machine to the waste — Look for a kink behind the cabinet, check it still rises to a high loop, and squeeze along its length for the hard spot that grease leaves.
Before you open anything
Safety
Switch the machine off at its breaker before a panel comes off or a hand goes into the sump — a capacitor can hold a charge after the power is off. Shut the supply valve under the sink before disturbing a fitting, and never wedge the door interlock to watch a wash run.
Models in the DUT family
Reference| Model number | Family key |
|---|---|
| DUT25400* | beko:dishwasher:dut |
| DUT25401** | beko:dishwasher:dut |
| DUT25401*** | beko:dishwasher:dut |
| DUT28430* | beko:dishwasher:dut |
| DUT36420*** | beko:dishwasher:dut |
| DUT36520*** | beko:dishwasher:dut |
| DUT36522*** | beko:dishwasher:dut |
When to call a technician
If the filter is clean, the impeller turns freely and the hose is clear, the next step is electrical testing of the pump and its circuit, and that is a service call on the DUT line. Call straight away if water is backing up into the sink as well as standing in the machine — that is a house drain problem and it will not be cured by anything done to the appliance.
Other problems covered for 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.
