Whirlpool Dishwasher Not Draining or Smells Bad — 5 Pump Filter Problems & Fixes

You run your dishwasher overnight, and in the morning there's still water pooled at the bottom. Or maybe the dishes come out clean enough, but every time you open the door you're hit with a smell that makes you wonder if something died in there.

Nine times out of ten? It's the pump filter.

The W10872845 pump filter sits at the bottom of your Whirlpool, KitchenAid, Maytag, or Kenmore dishwasher and catches everything from chicken bones to twist ties. When it clogs or breaks, you'll know fast — standing water, funky odors, or dishes that come out still covered in last night's lasagna.

This guide walks through the five most common pump filter failures, how to diagnose them, and whether you can fix it yourself or need to call someone.

Quick Symptom Check — What's Your Dishwasher Doing?

• Standing water at bottom after cycle — filter clog or broken impeller
• Bad smell even after running cleaner — trapped food debris in filter
• Loud grinding during drain cycle — filter housing cracked or debris in pump
• Error code on display (varies by model) — drain issue detected by sensor
• Dishes still dirty/gritty after wash — recirculating dirty water from clogged filter
• Water drains very slowly (takes 5+ minutes) — partial blockage in filter assembly

Cause #1: Clogged Filter Screen (Most Common — 65% of Cases)

This is the big one. The mesh screen on the W10872845 catches food particles, but it can't dissolve them. Over time — especially if you don't pre-rinse dishes or scrape plates well — the screen fills up with gunk.

How to diagnose: Open your dishwasher, remove the bottom rack, and twist out the filter assembly (usually counterclockwise). If the screen looks like it's wearing a fur coat made of grease and food particles, you've found your problem.

The fix: Remove the filter and rinse it under hot water. Use an old toothbrush to scrub the screen. For stubborn grease, soak it in hot water with dish soap for 20 minutes. If the screen is torn or the plastic housing is cracked, you'll need the replacement part.

Cost: $0 if just cleaning, $41.99 for W10872845 replacement

Time: 15 minutes for cleaning, 30 minutes for replacement

Prevention: Clean your filter every 2-4 weeks. Seriously. Set a phone reminder.

Cause #2: Broken Filter Housing (20% of Cases)

The plastic housing that holds the filter screen can crack, especially on models like the WDT780SAEM1 and WDT970SAHV0 that see heavy use. When it cracks, the seal fails and water bypasses the filter entirely.

How to diagnose: Remove the filter and inspect the housing closely under good light. Look for hairline cracks around the threads or at the bottom where it seats. Run your finger around the rim — if you feel rough edges or gaps, that's your problem.

The fix: You can't repair cracked plastic reliably. The W10872845 assembly includes the entire housing, so replacement is straightforward. Turn off power to the dishwasher, remove the old filter assembly, and twist in the new one until it seats firmly.

Cost: $41.99

Time: 20 minutes

Difficulty: Easy — no tools required for most Whirlpool models

Cause #3: Debris Jamming the Pump Impeller (10% of Cases)

Sometimes a piece of glass, a toothpick, or a chunk of broken dish makes it past the filter and jams the pump impeller below. You'll hear grinding or humming but no water movement.

How to diagnose: Remove the filter assembly completely. Shine a flashlight down into the pump chamber. You should see the impeller blades. Try to spin them gently with your finger (power OFF). If they won't budge or you see something wedged in there, that's your blockage.

The fix: Fish out whatever's blocking the impeller using needle-nose pliers or tweezers. Be careful not to damage the impeller blades. Once clear, reinstall the filter and test. If the impeller itself is damaged, that's a more involved pump motor replacement.

Cost: $0 if you can clear it yourself

Time: 10-30 minutes depending on what's stuck

Cause #4: Worn Filter Seal/O-Ring (3% of Cases)

The W10872845 has a rubber seal that creates a watertight connection between the filter and the sump. If this seal degrades, you get poor drainage and sometimes leaking.

How to diagnose: Remove the filter and examine the rubber gasket or O-ring. If it's hard, cracked, or misshapen, it's not sealing properly. You might also notice water leaking from the bottom of the dishwasher onto your floor.

The fix: The W10872845 replacement includes a new seal. If you just need the seal and your filter is otherwise fine, some appliance parts stores sell just the gasket — but at $41.99 for the complete assembly, it's usually worth replacing everything.

Cost: $41.99 for complete assembly

Time: 15 minutes

Cause #5: Installation Error After Previous Replacement (2% of Cases)

If someone recently replaced the filter (or you did) and now the dishwasher's acting up, it might not be seated correctly.

How to diagnose: The filter should twist in smoothly and lock with about a quarter-turn. If it feels loose, wobbles, or you can lift it out without twisting, it's not installed right.

The fix: Remove the filter completely. Clean any debris from the sump opening. Align the tabs on the filter with the slots in the sump, press down firmly, and twist clockwise until it stops. You should feel it lock into place.

Cost: $0

Time: 5 minutes

Compatible Models — Will This Part Fit Your Dishwasher?

The W10872845 pump filter replaces AP6030094, W10393351, WPW10693534, 8579307, and PS11759673. It fits these Whirlpool, KitchenAid, Maytag, Kenmore, and Amana models:

• Whirlpool WDT780SAEM1, WDT780SAEM2
• Whirlpool WDT970SAHV0, WDT970SAHB0
• Whirlpool WDT920SADM1, WDT920SADM2, WDT920SADM3, WDT920SADE3
• Whirlpool WDT910SAYH0, WDT910SAYH3
• Whirlpool WDT730PAHZ0, WDT750SAHZ0
• Whirlpool WDT720PADM0, WDT720PADM2

Check the full compatibility list on the product page or your dishwasher's model number (usually inside the door frame).

When to Call a Pro Instead

You can handle filter replacement yourself. But call someone if:

• You've replaced the filter and still have standing water — the drain pump motor itself might be dead
• You hear loud grinding even with the filter removed and pump clear
• Water is leaking from somewhere other than the filter area
• Your dishwasher is throwing error codes you can't reset
• You find water under the dishwasher pooling on the floor — could be a drain hose issue

A service call runs $150-$250 depending on your area. If it's just the filter, you'll save $100+ doing it yourself.

Frequently Asked Questions

How often should I clean my Whirlpool dishwasher pump filter?

Every 2-4 weeks for most households. If you cook a lot or have hard water, go weekly. You'll know you've waited too long when you start smelling it or seeing standing water. Set a calendar reminder — cleaning takes 10 minutes and prevents $200 service calls.

Can I run my dishwasher without the pump filter installed?

Absolutely not. The filter protects the pump from debris that would destroy it. Running without the filter will kill your drain pump in a matter of weeks, turning a $42 fix into a $300+ repair. Don't do it even "temporarily."

Why does my dishwasher smell even after I clean the filter?

Two reasons: either you're not cleaning it thoroughly enough (use a toothbrush on the mesh, soak in hot soapy water), or debris is trapped in the drain hose or pump chamber below the filter. Remove the filter, shine a light down there, and check for gunk stuck to the walls of the sump. Sometimes running a dishwasher cleaner tablet through an empty cycle helps, but mechanical cleaning is more effective.