The short answer
Start here -- on a Janska dishwasher, water standing in the tub at the end points first at a blocked filter and sump, not at a failed drain pump. Second, and worth checking in the same hour, is a kinked hose or lost high loop. 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 -- water on the kitchen floor — That is a leak, and the cabinet matters more than the machine.
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 a Janska compact machine, often fed from a faucet the sump is where the debris is, and clearing it is the one repair every owner can do.
- 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. Ranked here because a kink stops flow and a lost loop lets the sink flow back in.
- Something hard is in the sump — A shard of glass, an olive stone or a bone fragment jams the impeller. The pump hums, the water stays, and the object is usually visible once the filter is out. This rank, because a jammed impeller hums without moving water.
- 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. Low here: it is quick to check at the sink rather than inside the machine.
- 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.
- Check the hose rises before it falls — Look under the sink: the hose must loop up high before it connects.
- 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
Power off at the breaker and close the supply stop first; wash water is hot enough to scald at the end of a cycle. Never run the machine with the kick panel off, and never mix cleaning chemicals in the tub.
When to call a technician
Filters, arms, hoses and detergent are yours; pumps, valves, boards and anything behind the kick panel are not.
Nearest pages of this class
What this page does not cover
This page covers the Janska 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.
