Whirlpool WDT790SAYM2 undercounter dishwasher Parts

To identify your Whirlpool dishwasher model, open the door and look for the rating label on the inside edge of the tub (commonly along the left side). The label lists the model number and serial number you need for parts and service; for this page, the model is WDT790SAYM2.

Where to find the model number

Check these common label locations on an undercounter dishwasher:

• Inside the door opening on the tub frame (often left side)
• Along the top edge of the door or tub opening
• On the side wall of the tub near the front
• Occasionally on the right side of the tub opening

Use the exact model number from the label, including all letters and numbers.

What to write down (and why)

Record both numbers exactly as shown:

• Model number: identifies the correct parts list and diagrams
• Serial number: helps match production changes and compatible replacements
• Brand: Whirlpool (useful when searching manuals and repair info)

Quick reference

Item	What it does	Example
Model number	Matches parts to your exact dishwasher	WDT790SAYM2
Serial number	Identifies manufacturing details	(varies by unit)

Why it matters

Using the correct model number prevents ordering the wrong items, especially for fit-sensitive parts like a drain hose, door seal, or control panel. Once you confirm the model, we use it to match parts such as the dishwasher drain hose 8269144A and installation requirements in the WDT790SAYM2 installation guide.

Last updated: February 2026

A Whirlpool dishwasher typically lasts 10 to 12 years. For your Whirlpool WDT790SAYM2 undercounter dishwasher, lifespan depends most on water quality, how often it runs, and routine care like filter cleaning and using rinse aid for better drying and less mineral buildup (see the WDT790SAYM2 installation guide).

What affects how long it lasts

• Hard water scale: mineral buildup strains the wash system and heater
• Filter and sump cleanliness: clogs force pumps to work harder
• Detergent and rinse aid use: improves cleaning and drying, reduces deposits
• Loading habits: overloading blocks spray and increases rewash cycles
• Small leaks: moisture can damage wiring and controls over time

Maintenance that adds years (practical checklist)

• Clean the filter regularly; inspect the dishwasher filter W10872845 for debris and damage.
• Use rinse aid consistently for drying performance and to help control hard-water deposits.
• Run hot water at the sink before starting a cycle so the dishwasher fills with hotter water.
• Check the drain path if you see standing water; a restricted hose can overwork the drain system.
• Fix leaks promptly; replace worn seals such as the dishwasher door seal, lower WPW10497235 if you see drips at the bottom of the door.

Common “end-of-life” symptoms vs. fixable issues

What you notice	Often means	Common next step
Poor drying, cloudy glasses	Rinse aid low, hard water deposits	Add rinse aid; clean filter; verify heater operation
Standing water after cycle	Drain restriction or drain pump issue	Check hose routing; inspect drain pump
Weak cleaning, food left behind	Clogged filter or spray issues	Clean filter; inspect spray arm
Random stopping or no start	Door latch, power, or control issue	Check power, latch, then diagnostics

Why it matters

Most “short lifespan” complaints come from buildup, restricted draining, or small leaks that go unchecked. Keeping the wash system clean and the door sealed reduces stress on key components like the heater, pumps, and electronic control.

Last updated: February 2026

On Whirlpool dishwasher model WDT790SAYM2, spray arms usually stop spinning when water flow is too weak or blocked by debris, a clogged filter, or a wash system issue (spray arm, diverter, or pump). Start by cleaning the filter and spray arm holes, then confirm the tub is filling with water.

Quick checks we recommend first

• Make sure tall items are not blocking the spray arm path (cookie sheets, cutting boards, long utensils).
• Remove the lower rack and spin the spray arm by hand; it should turn freely without scraping.
• Clean the spray arm holes and hub area; clear food and mineral buildup.
• Clean the filter area; a restricted filter reduces pressure to the arms.
• Confirm the dishwasher is actually filling; after the cycle starts, there should be water in the bottom of the tub.

Parts that commonly cause no-spin symptoms

If cleaning and loading checks do not fix it, these parts are the most common causes on this style of Whirlpool dishwasher:

Symptom	Most likely cause	What to do next
Arms barely move, poor cleaning	Clogged filter or spray arm ports	Clean filter and spray arm thoroughly
Arms stop and start, weak spray	Low fill or restricted inlet	Check water supply, then test inlet valve
One zone washes, others weak	Diverter not routing water	Inspect/replace diverter motor
Hums, poor circulation	Pump/motor issue	Inspect circulation pump and sump for debris

Helpful model-matched parts to consider:

• Dishwasher spray arm WPW10491331
• Dishwasher filter W10872845
• Dishwasher diverter motor W10537869
• Dishwasher water inlet valve WPW10327249

How to confirm the dishwasher is filling (simple test)

We use this quick fill check because low water level means low pressure, and low pressure means the spray arms will not spin.

• Start the shortest wash cycle.
• After about 2 minutes, unlatch the door, wait 5 seconds, then open it.
• Look for water in the bottom of the tub.
• If water is low or absent, focus on the water supply and inlet valve.

For the exact startup and check procedure for WDT790SAYM2, follow the steps in the WDT790SAYM2 installation guide.

Why it matters

Spray arms are driven by water pressure. Any restriction (filter, spray arm ports, sump debris) or any loss of pressure (low fill, diverter or pump problems) reduces the force needed to rotate the arms, leading to dirty dishes and leftover detergent.

Last updated: February 2026

A bottom-of-door leak on your Whirlpool WDT790SAYM2 dishwasher almost always happens when water is being pushed past the lower door seal by poor draining, oversudsing, or a spray pattern that hits the door area. Start by checking loading, detergent, and the filter and drain path before replacing parts.

Quick checks that fix most bottom-of-door leaks

• Confirm the dishwasher is level front-to-back and side-to-side (a forward tilt can encourage leaks).
• Use only automatic dishwasher detergent; do not use dish soap.
• Reduce detergent if you have soft water or you see suds during the wash.
• Reposition tall items so they do not block the spray arm or deflect water toward the door.
• Clean the filter area and remove debris that can cause water to pool.

Parts to inspect on WDT790SAYM2

If the quick checks do not stop the leak, inspect these common leak sources:

What to check	What you may notice	Related part (if needed)
Lower door seal	Drips from the center/bottom edge of the door	Dishwasher door seal, lower WPW10497235
Filter cup area	Standing water, debris, poor wash and drain	Dishwasher filter W10872845
Drain performance	Water left in tub, leak happens mid-cycle or near end	Dishwasher drain pump WPW10348269
Spray pattern	Water jets seem weak or uneven, items stay dirty	Dishwasher spray arm WPW10491331

Why draining and spray issues cause a “door seal” leak

The door seal is designed to hold back normal wash water. When the tub water level rises from restricted draining, or when a blocked spray arm redirects a strong stream at the door, water can “overpower” the seal and escape at the bottom edge.

Safe, practical next steps

• Turn off power at the breaker before inspecting internal parts.
• Run a short cycle and watch for suds or unusually high water level.
• Clean the filter area first; then re-test.
• If water remains in the tub after draining, focus on the drain path and pump.

For model-specific guidance on leveling, securing the dishwasher, and post-install checks, use the WDT790SAYM2 installation guide.

Last updated: February 2026