The short answer
Water standing in the tub at the end: on an IKEA dishwasher that is usually a blocked filter and sump, not a failed drain pump. The next thing to rule out is a blocked air gap or disposal port. Work the order below -- cheap causes first, the one that is not an owner fix last.
What you are looking at
- The pump hums with no water movement — Audible effort with no result.
- Dirty water stands in the tub at the end — It covers the sump and does not fall.
- The machine drains slowly over hours — The tub is empty by morning.
- NEAR MISS -- it never filled in the first place — That is a supply or float fault rather than a drain fault.
Causes, most likely first on this kind of unit
- The filter and sump are blocked — Everything that comes off the dishes settles here. Packed solid, it starves the pump inlet and leaves dirty water standing after every cycle. First here, because on an IKEA appliance on its mainstream OEM platform the sump is where the debris is, and clearing it is the one repair every owner can do.
- The air gap or disposal connection is blocked — Most machines drain through an air gap or a disposal nipple. A silted air gap, or a nipple never knocked out during installation, stops the water cold. This rank, because a blocked outlet returns or holds the water the pump just moved.
- The drain hose is kinked or has lost its high loop — The hose must rise before it falls, or the sink drains back into the machine. Crushed behind a cabinet or dropped low, it either blocks or siphons. This rank, because a kink stops flow and a lost loop lets the sink flow back in.
- The non-return valve is stuck — A valve that no longer closes lets drain water return. The machine empties and then refills itself, so you find dirty water standing without the pump having failed. Late on this list -- it explains water that returns rather than water that never leaves.
- The drain pump or its circuit — A pump that is silent when it should run, with a clear sump and free impeller, needs a meter and usually replacement. That is behind the kick panel. It comes last because it is the one cause here that is not an owner repair, so it is last.
Check in this order, and why
- Pull the filter and empty the sump — Bail the water out first, then lift the filter and clear what is underneath.
- Open the air gap cap and look inside — Clear the silt; if there is a new disposal, confirm its drain nipple was knocked out.
- Only after the sump and outlet are proven clear — Silence where the pump should run, with a clear sump, is a service call.
What an owner can safely check
- Bail the water out, then pull the filter — Use a cup and towels.
Tools: cup, towelsAbout 20 min
- Clear the sump and feel for hard objects — Power off first.
Tools: glovesAbout 15 min
- Open the air gap at the sink and clear it — Lift the cap, clear the silt, and check a new disposal's drain nipple was knocked out.
About 15 min
- STOP HERE -- the next step needs the kick panel off — Drain pumps, check valves and float switches are technician work on a live circuit.
Before you open anything
Safety
Switch the dishwasher off at its breaker or the switch under the sink before any panel comes off, and close the supply valve before touching a fitting. Water in the sump can be scalding at the end of a cycle.
When to call a technician
Call once the filter, the spray arms, the drain path and the detergent have all been ruled out.
Nearest pages of this class
What this page does not cover
This page covers the IKEA dishwasher as a class, not one family or model line. Where a family- or model-specific page exists for your unit it is the more specific answer -- go there first if your model is named. Deliberately not here: pump part numbers, check-valve locations, air-gap fittings and the panel-removal order, all of which differ by family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
