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Whirlpool Dishwasher Not Cleaning Dishes: 7 Causes and Fixes

Quick Answer

A Whirlpool dishwasher that is not cleaning dishes well is almost always caused by one of four things: clogged spray arm holes, a packed filter cylinder, wrong detergent quantity, or water temperature too low. On WDT series models, the lower spray arm can accumulate hard water deposits that block the jets.

A Whirlpool dishwasher that is not cleaning dishes well is almost always caused by one of four things: clogged spray arm holes, a packed filter cylinder, wrong detergent quantity, or water temperature too low. On WDT series models, the lower spray arm can accumulate hard water deposits that block the jets. The filter cylinder at the tub floor is the other primary maintenance item. Neither requires any tools to inspect and clean. If cleaning both still leaves dirty dishes, check that water is reaching at least 120F at the supply tap.

WhirlpoolDishwasherSeverity: low85% DIY Success
Time to Fix
10–30 min
Difficulty
beginner
Parts Cost
—
Tools Needed
Toothpick, Soft-bristle brush

What Does the NOT-CLEANING Code Mean?

Poor cleaning on Whirlpool WDT series units most often comes from clogged spray arm holes or a packed filter - both are 5-minute no-tool fixes. After those, check water temperature and detergent dosing.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Spray arm jet holes blocked with hard water scale or debris40%
Filter cylinder clogged restricting water circulation24%
Insufficient detergent or wrong detergent type14%
Dishes blocking spray arm rotation12%
Water temperature below 120F entering the dishwasher10%

Symptoms You May Notice

  • Food residue left on plates, pots, or glasses
  • White film or spots on glassware
  • Dishes on the bottom rack clean but top rack dirty (or vice versa)
  • Consistently poor results despite using quality detergent

Can you reset a Whirlpool dishwasher to clear the NOT-CLEANING code?

No reset needed for cleaning issues. After completing cleaning maintenance, run a Heavy cycle with a fresh detergent pod to test results.

Tools Required for Diagnosis

ToothpickSoft-bristle brushDish soapThermometer

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Remove both spray arms (lower arm twists counterclockwise; upper

Remove both spray arms (lower arm twists counterclockwise; upper arm clips or screws off). Hold each arm up to a light and look through the holes. Hard water scale or food will block the jets. Poke out any blockages with a toothpick and rinse under running water.

2

Twist out the filter cylinder and flat mesh screen from the tub floor

3

Run the kitchen hot tap until it runs hot

Frequently Asked Questions

Should I rinse dishes before loading them into a Whirlpool dishwasher?
Whirlpool recommends scraping large food pieces off but not pre-rinsing. Modern detergent enzymes need some soil to activate properly. Heavily pre-rinsed dishes can actually lead to worse cleaning because the enzymes have nothing to work on.
Why are my top rack dishes dirty but bottom rack dishes clean?
This almost always means the upper spray arm is blocked or not spinning. Check that no tall items in the lower rack are blocking the upper spray arm from rotating, and inspect the upper arm jets for blockage.
Does the brand of detergent matter?
Yes. Whirlpool recommends using a quality pod-type detergent. Generic brands and older powder formulas can leave more residue. Using rinse aid in the dispenser is also critical in hard water areas for spot-free results.

Related Whirlpool Dishwasher Error Codes

Code: NOT-SPRAYINGWhirlpool Dishwasher Not Spraying Water: Causes and FixesCode: NOT-HEATINGWhirlpool Dishwasher Not Heating Water: Diagnosis GuideCode: E2 F2Whirlpool Dishwasher E2 F2 Error Code: Water Temperature Low

Same Fix Works on These Brands

Whirlpool shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

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Models Known to Experience NOT-CLEANING Errors

This repair applies to most Whirlpool dishwashers with this error code. Common model numbers include:

WDT780SAEM, WDF550SAHZ, WDT730PAHZ, WDT750SAHZ, WDT970SAHZ, WDF518SAHM, WDT720PADE

Last verified for technical accuracy on March 14, 2026