The short answer
This page covers an Electrolux dishwasher that drains, but slowly, partially, or with dirty water returning into the tub between programmes. That is a restriction and siphon problem rather than a blockage: the drain hose height and the missing high loop matter more here than anything inside the machine, and both are corrected without a part.
Causes, ranked for this Electrolux dishwasher
- Drain hose without a high loop — Why: Without a rise above the tub before the hose drops to its connection, sink water siphons back into the machine, which produces dirty water and a tub that never truly empties.
- Filter partly silted — Why: A filter that is half full slows the drain instead of stopping it, which is why the complaint develops gradually and is usually noticed as a longer programme.
- Drain hose partly kinked or sagging — Why: A hose with a sag holds water in the dip and a partial kink throttles flow, both of which leave a residue in the tub without ever blocking it.
- Air gap partly blocked, where one is fitted — Why: A silted air gap restricts flow and can push water back toward the machine, and it is the component owners least often know exists.
- Pump wearing or its impeller partly obstructed — Why: Last, because a pump that has genuinely weakened is far less common than a restriction anywhere along a path that is easy to check.
What to check, in order
- open the sink cabinet and check whether the drain hose rises to a high loop. — Because: it is the top-ranked cause and it is what produces returning dirty water.
- remove and wash the filter assembly. — Because: a half-silted filter slows the drain gradually, which is exactly the reported pattern.
- trace the whole hose for sags and partial kinks. — Because: a dip in the hose holds water and a partial kink throttles it, neither of which blocks the drain outright.
- lift and clear the air gap on the sink, if one is fitted. — Because: a silted air gap restricts flow and pushes water back, and it is rarely inspected.
Checks you can safely do yourself
- Switch the machine off at the breaker and remove the filter assembly, washing it under running water with a brush. — Tools: gloves and a brush — Time: several minutes
- Open the sink cabinet and confirm the drain hose rises above the level of the tub before dropping to its connection, securing it if it does not. — Tools: a torch and a cable tie — Time: several minutes
- Trace the hose along its whole length, removing any sag that holds water and easing any partial kink behind the machine. — Tools: a torch — Time: several minutes
- Lift the air gap cover on the sink, if fitted, and clear any debris inside it. — Tools: a cloth — Time: several minutes
- Run a short programme and check whether the tub clears fully. Stop here: the pump is reached from underneath the machine. — Tools: none — Time: the better part of an hour, mostly waiting
Before you open anything
Safety
unplug-before-service
Wear gloves when clearing a dishwasher sump or an air gap, since broken glass and sharp debris are common in both. Kill power at the breaker before reaching into the machine, and take care working in a sink cabinet where a waste disposer is fitted.
Where the owner fix ends
Cleaning the filter, forming a high loop, easing a kink and clearing an air gap are owner work. Call a technician when the hose, loop, filter and air gap are all correct and the machine still leaves water behind, because the pump is what remains and it is reached from underneath the machine.
Nearest pages of the same kind
Generalized information — what this page does not cover
family model
This page is generalized information covering only the slow and partial-drain branch of the Electrolux dishwasher drainage complaint; the companion page linked below covers a total blockage. Neither separates the built-in and integrated families. No family-level or model-level page exists in this reference yet; when one is published it will be linked here.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
