Direct answer
For the Whirlpool WDT730HAMZ dishwasher, locate the first drop during fill, wash and drain instead of diagnosing from the final puddle. First, dry the area and run a short observed cycle.
What this covers
- Whirlpool WDT730HAMZ dishwasher (WDT730HAMZ)
- Whirlpool dishwasher; exact model determines filter, third rack, fan/heat and code display.
- The specific fault this record addresses: is leaking water
What it does not cover
- ×The same symptom on a different Whirlpool product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
Detergent overdosing or the wrong product is generating suds
What separates it Foam visible in the tub, and leaking that only happens on some loads. Hand dish soap in a dishwasher produces enough foam to force water past the door seal.
How to confirm Never use hand dish soap. If it has been used, run repeated rinse cycles until the foam is gone before assessing any leak.
- 2
The door gasket is damaged, displaced or dirty
What separates it Water appears at the front of the door during the wash phase, and inspecting the seal reveals a tear, a section pushed out of its channel, or hardened food residue holding it open.
How to confirm Run a finger around the full gasket. Debris can be cleaned; a tear or a permanently deformed section needs replacement.
- 3
The machine is not level
What separates it Water escapes consistently from one front corner, and a spirit level across the door opening shows a tilt.
How to confirm Adjust the levelling feet. A dishwasher tilted forward or to one side pools water against the door seal instead of in the sump.
- 4
A supply or drain connection under the sink is weeping
What separates it Water appears under the sink or at the rear rather than at the dishwasher door, and is clean rather than soapy.
How to confirm Check the water supply valve, the fill hose connection and the drain hose clamp under the sink — many suspected dishwasher leaks originate here.
- 5
Items are deflecting spray directly onto the door seal
What separates it Leaking only with certain loads, typically large flat items like baking sheets or cutting boards loaded in the front row.
How to confirm Large flat items in the front row act as a ramp, directing the spray arm's output straight at the door. Move them to the sides or the rear.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Whether the water is clean or soapy — clean points at a supply connection, soapy points at the tub or door.
- Whether foam is visible in the tub, and whether hand dish soap has ever been used in the machine.
- Whether the leak happens on every load or only with particular items loaded in the front row.
- Whether the machine is level across the door opening.
Confirm no hand dish soap has been used and clear any foam
ReversibleRun repeated rinse cycles until the tub is foam-free before judging whether a leak exists at all.
Dry the floor and run a short cycle, noting when and where water first appears
ReversibleDiagnosing from the final puddle is unreliable because water tracks along the base first.
Inspect the full door gasket for tears, displacement and trapped residue
ReversibleDebris can be cleaned; a tear or deformed section needs replacement.
Check the machine is level and inspect the connections under the sink
ReversibleMany suspected dishwasher leaks are actually a weeping supply valve or drain hose clamp under the sink.
Reload large flat items to the sides or rear rather than the front row
ReversibleBaking sheets in the front row deflect spray straight onto the door seal.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- WDT730HAMZ. Whirlpool dishwasher; exact model determines filter, third rack, fan/heat and code display.
- Drying — heated dry (has an element)
- Heated-dry option with an element — dries plastics better than Bosch, but keep plastics off the tub floor to avoid melting. Rinse aid helps.
- Wash & racks
- Stainless tub with adjustable racks and a sensor cycle; check your build for a 3rd rack. Manual filter must be cleaned periodically.
- Drain path
- 'Won't drain' is usually the filter, drain hose, air gap, or an un-removed disposer knockout plug.
- Symptom boundary
- This record covers Whirlpool WDT730HAMZ dishwasher when it is leaking water. A different symptom on the same hardware, or this symptom on a different Whirlpool product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Turn off power at the breaker and close the supply valve for water spraying under pressure, water reaching an outlet or wiring, or any leak under the cabinet reaching flooring or subfloor.
- !Water under the cabinet that has been leaking for some time can damage flooring and cabinetry — check the floor of the cabinet as well as the visible area.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Whirlpool Product Help publishes this as "Product Help". Official Whirlpool use, installation, maintenance, error-code and troubleshooting library. What that article does not carry is the model boundary — it is written for a product line, and WDT730HAMZ is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
My Whirlpool WDT730HAMZ dishes are wet at the end.+
If you are not using the heated-dry option, dishes rely on rinse aid and residual heat, so plastics stay damp. Turn on Heat Dry (or Sani Rinse) for hotter, drier results, keep the rinse-aid tank filled, and crack the door open after the cycle. Unload the bottom rack first so drips from above do not fall on it. This model does have a heating element, so it can dry better than a Bosch if you enable it.
It only leaks when I run certain loads.+
Look at what is in the front row. Large flat items — baking sheets, cutting boards, platters — act as a ramp that deflects the spray arm's output straight at the door seal. Move them to the sides or the back and the leak usually stops entirely.
I used regular dish soap once and now it's leaking everywhere.+
That is foam rather than a fault. Hand dish soap generates far more suds than a dishwasher can contain, and the foam forces water past the door seal. Run repeated rinse cycles until the tub is completely foam-free before deciding whether anything is actually damaged.
Does this answer apply to every Whirlpool model?+
No. It is scoped to WDT730HAMZ. Whirlpool dishwasher; exact model determines filter, third rack, fan/heat and code display.
What should I record before troubleshooting leaking or water on floor?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing leaking, water on floor. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Turn off power and water for spraying, under-unit leaks or electrical wetting.
Answer for the exact device and software version shown above.