Built-in dishwasher with the door open and racks pulled out
9 components covered

Field manual · Dishwasher

Whirlpool WDT730PAH (WDT730PAHZ) dishwasher: quick sheet

Covers: Whirlpool 24 in top-control WDT730PAH* (Z = fingerprint-resistant stainless, B/W/V color variants), sold approx. 2017-2021 (inferred from listing dates; retailers now mark it discontinued).

Cross-checkedBrands: Whirlpool9 components

A high-volume big-box Whirlpool model: plastic tall tub, 15 place settings, 51 dBA, hidden top controls, three wash arms, fan dry and a manual-clean filter. It is the standard Whirlpool electronic platform, so F#E# codes and the 1-2-3 diagnostic entry apply.

Safety first

  • Turn off the breaker (or unplug) before removing the toe kick or any panel; a hard-wired unit can still be live at the junction box.
  • Close the hot-water supply valve before touching the inlet valve or supply line.
  • Let the unit cool after a cycle: the heating element, heater housing and water can be hot enough to burn.
  • Sump and filter areas often hold broken glass; wear cut-resistant gloves.
  • Never bypass the float, flood or leak switch to make a unit run; find the source of the water instead.

How it works

Fill: the inlet valve fills to a timed level; the float switch is the overfill guard.

Wash: one wash motor drives water through three wash arms (lower, middle and upper). Cycles: Sensor Wash, Heavy, Normal, 1-Hour Wash and Soak & Clean; options include Hi Temp Wash, Sani Rinse, Heated Dry, delay and control lock.

Sensing: the thermistor/OWI sensor reads temperature and soil so Sensor Wash can adjust the length.

Drying: the element in the tub floor heats the air, and a fan helps move moist air out (Whirlpool calls this Fan Dry). With heated dry off it relies on residual heat and rinse aid.

Filter: a two-part filter at the back of the tub floor must be cleaned by hand. There is no grinder to chew up food.

Components & tests

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Built-in dishwasher with the door open and racks pulled out by Castorly Stock, Pexels License

Diagnostic guides for this appliance

Component test · Dishwasher

How to test a dishwasher heating element

Many US dishwashers have a hidden or visible loop element under the tub. A good one reads in the tens of ohms. A leak to the tub trips the GFCI even when the resistance looks fine, so always check to ground.

5 steps ~20 mineasy
Component test · Dishwasher

How to test a dishwasher circulation (wash) pump motor

The wash motor pushes water to the spray arms. Older units use an AC induction motor; many newer ones use a brushless DC motor driven by the board. Rule out a jam and a filter clog before testing, and use the tech sheet for winding values.

6 steps ~45 minmoderate
Component test · Dishwasher

How to test a float switch (dishwasher overfill and similar)

A float rides up with water and opens or closes a small switch under the tub. It stops overfill or flags a leak. Make sure the float moves freely before blaming the switch.

6 steps ~20 mineasy

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Whirlpool WDT730PAH (WDT730PAHZ) dishwasher: quick sheet · OnCall Tech