The short answer
On a DCS dishwasher, where the water is escaping comes down to a short list, and on this line the order is not the generic one. The diagnosis starts at the seal on whichever layout you actually have — drawer lid or hinged door, because the older badge covers both layouts, so the first job is establishing which one is in front of you: the seal that fails is a different part, in a different place, in each case. The first three checks below need no tools and no parts; the point at which this stops being an owner job is stated further down, as a condition rather than as a recommendation.
What you are seeing
- Water on the floor in front of the machine after a cycle.
- A wet patch under the cabinet next to the machine rather than in front of it.
- Water running down the inside of the door and out at the bottom edge.
- Damp or lifting floor covering discovered before any visible water.
- Suds on the floor rather than clean water.
- A drip that only appears during the fill or only during the drain.
- Note: Near-miss symptoms that mean a different fault: If water is standing inside the tub, that is the drainage page. If the machine is only damp around the door with no puddle, the seal is the subject. If the water is soapy and foaming out of the door, the wrong detergent was used and that is a chemistry problem, not a leak.
Causes, ranked for a DCS dishwasher
- The seal on whichever layout you actually have — drawer lid or hinged door — Why this rank: The older badge covers both layouts, so the first job is establishing which one is in front of you: the seal that fails is a different part, in a different place, in each case.
- A supply or drain hose fitting not tight — Why this rank: These are the only pressurised joints on the machine and they are made by hand at install.
- A machine not level so the tub carries water to one corner — Why this rank: A tub that is out of level puts the water line above the door seal on one side and nowhere near it on the other.
- A worn pump or sump seal — Why this rank: It leaks under the machine rather than in front of it, which is why it is usually found by damp flooring rather than by a puddle.
- A cracked tub or a corroded seam — Why this rank: It is uncommon and it is terminal, so it is named last and only after everything reversible is excluded.
- Hand dish soap or too much detergent foaming out — Why this rank: Foam finds every gap in the door, and the leak stops the moment the chemistry does.
What to check, in order
- Dry the floor completely and lay paper towel across the front and under the adjacent cabinet, then run one cycle and see which is wet. — Order: First — Why: It tells you whether the water is coming out of the door or from under the machine, and those are two entirely different repairs.
- Note whether the water appears during the fill, during the wash, during the drain, or while the machine is idle. — Order: Second — Why: Each phase pressurises a different part of the machine, so the timing names the component.
- Inspect the door seal all the way round for tears, flat spots and displaced sections, and clean it. — Order: Third — Why: It is the top-ranked cause and it is confirmed by looking and feeling rather than by testing.
- Confirm what detergent has been used, and run a cycle with the correct product and the right dose. — Order: Fourth — Why: A foam leak looks exactly like a seal leak and it is corrected without a part.
Steps a homeowner can take
- Switch the machine off at its breaker and shut its water supply valve before removing a panel. — Tools: none — Time: a moment
- Dry the floor and lay paper towel front and side, then run one cycle and check both. — Tools: paper towel — Time: an hour or more
- Wipe the door seal all the way round with a damp cloth and run a finger along it looking for tears and flat spots. — Tools: cloth — Time: several minutes
- Reseat any section of the seal that has lifted out of its channel, working from the middle outward. — Tools: none — Time: several minutes
- Put a level across the door opening and along the tub floor, and adjust the machine feet until both read level. — Tools: spirit level, adjustable wrench — Time: half an hour or so
- Open the cabinet beside the machine, check the supply and drain fittings for damp, and snug them by hand. — Tools: flashlight, towel, adjustable wrench — Time: half an hour or so
Before you start
Safety
Switch the machine off at its breaker and close its water supply valve before removing any panel. A capacitor can hold a charge after the power is off. Water pooling under a powered built-in appliance is a shock hazard and it will reach the wiring in the base before it reaches the floor you can see. Never run a machine you know is leaking in order to reproduce the fault without watching it.
When this stops being an owner job
Call when the water is arriving from under the machine rather than out of the door, when a fitting weeps after being tightened, or when the leak continues with a clean, undamaged seal and correct detergent. A pump or sump seal means the machine comes out of the cabinet.
Sources
General guidance- The control of hazardous energy (lockout/tagout), and manufacturer service-manual practice — OSHA 1910.147 / manufacturer service manuals, fetched 2026-09-06
Nearest pages
Generalized information
This page is generalized: it covers DCS across a whole dishwasher range rather than one family or one model, and where a more specific page exists it is linked here. It does not cover the current DCS by Fisher & Paykel badge and model-level pages, and it does not carry serial-range or model-group detail — check the rating plate before ordering any part. DCS by Fisher & Paykel Dishwasher: Water Leak — Slug: dcs-by-fisher-paykel-dishwasher-water-leak — Covers: the DCS by Fisher & Paykel line specifically
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
