The short answer
A dishwasher that will not drain is telling you the water has nowhere to go. On the DIS 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 small group of numbers that share their construction, which is what fixes the order of the checks below.
What you observe on these models
- The machine hums but the water level does not move — The pump is being commanded and is drawing current, so the fault is mechanical rather than electrical.
- A gurgle at the sink each time the machine drains — The waste connection is restricted or the air gap is partly blocked, so the drain is fighting back.
- 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.
- 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 DIS line
- Kinked, looped or blocked drain hose — The leading cause on this platform. Grease sets inside a drain hose over years and narrows it from the inside, which produces a drain that works slowly and then not at all.
- Blocked filter and sump screen — Close behind it. 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.
- Drain pump impeller jammed — Third in order, and the one most often missed. A jammed impeller gives the classic signature — the machine hums for the full drain period and the water level never falls.
Check in this order, and why
- 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.
- 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.
- 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.
Before you open anything
Safety
Kill the power at the breaker first: a capacitor can hold a charge after the power is off. Treat standing water as if it holds glass, scoop it out rather than feeling through it, and leave the door interlock alone — it is what keeps scalding water inside the cabinet.
Models in the DIS family
Reference| Model number | Family key |
|---|---|
| DIS25840 | beko:dishwasher:dis |
| DIS25841 | beko:dishwasher:dis |
| DIS25842 | beko:dishwasher:dis |
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 DIS 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.
