The short answer
A Conservator dishwasher that is leaking onto the kitchen floor is most often the door seal or a deflected spray, with a hose connection under the sink close behind. A built-in is plumbed once and then forgotten, which means its faults are usually in the installation under the sink rather than in the machine under the counter. Two of the four are owner work; the last one on the list is not, and knowing which is which saves the call-out.
What you observe
- Water on the floor in front of the machine — The door seal, or something deflecting the spray at it.
- A damp cupboard or a swollen plinth — A slow weep under the sink that has been running for weeks.
- NEAR MISS - a new noise with clean dishes — Something loose against an arm - check the load before anything else.
Causes, most likely first on this brand
- The door seal or a deflected spray — First on this cabinet: the seal keeps water in only while the spray stays where it should, so a tall item catching an arm and throwing water straight at the door produces a leak with a perfectly good gasket.
- A hose connection under the sink — Second, and close behind: the supply and drain connections live in a cupboard nobody looks in, so a weep there soaks a floor for weeks before anyone notices.
- Washing-up liquid in the machine — Third: hand dish soap foams enormously in a dishwasher, and the foam pushes out past seals that water alone would never reach.
- A machine that is not level in its opening — Last, and that is the whole point of the order: a built-in leaning forward carries its water to the door seal instead of the sump, and a tub out of square never seals evenly.
Check in this order, and why
- Run a finger round the seal, then look for a tall item catching an arm — A perfect gasket leaks if the spray is being thrown at it.
- Look in the cupboard under the sink with a torch — A weep there has usually been running far longer than the visible leak.
- Ask what detergent went in — Hand soap makes a healthy machine leak, and nothing else does it so completely.
What an owner can safely check
- Reload the machine with nothing face to face and nothing over the upper arm — Then run the same cycle and compare. It costs one wash and settles the commonest cause.
About 20 min
- Run an empty cycle with no detergent at all — If foam and leaking stop, hand soap was the cause.
About 45 min
- Take the filter out, rinse it under the tap and brush the mesh — Look at what comes off it. This is a ten-minute job that people do once a year and should do monthly.
Tools: brush, warm waterAbout 15 min
- STOP HERE if the next step means pulling the machine out or removing a panel — There are live terminals and standing water behind it, and that is where owner checks end.
Before you open anything
Safety
Switch the dishwasher off at its breaker before pulling it out, removing the kickplate or reaching into the sump; a capacitor can hold a charge after the power is off and there is standing water inside the machine beside live terminals. Reach into a sump slowly and with a torch - broken glass finds fingers there more often than anywhere else in a kitchen. Never run a machine with the door interlock defeated.
When to call a technician
Call when the seal is clean and intact, nothing tall is deflecting a spray arm, the detergent is right and water still reaches the floor. Call promptly rather than monitoring it: a built-in leak runs under the cabinets and into the flooring, and the damage regularly costs several times the price of the repair.
Nearest pages of this class
What this page does not cover
This page covers full-size built-in dishwashers as a class rather than one model line. Door seal profiles, tub designs and connection layouts differ by family and by installation, and where a family- or model-specific page exists for your unit it is linked below. Not here: fitting sizes, capacities and part identifiers.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
