Whirlpool Dishwasher Won't Drain: 5 Causes Ranked

Quick Answer

A Whirlpool dishwasher that will not drain has standing water at the bottom of the tub after the cycle ends. The most common cause is the twist-lock filter cylinder being clogged with food debris. Second is the drain hose lacking a high loop, allowing back-siphoning from the sink drain.

When I get a call for a Whirlpool with standing water, the first thing I check isn't the pump, it's the sink. If you just installed a new garbage disposal, nine times out of ten the installer forgot to knock out the plastic plug. Beyond that, a clogged filter or a sagging drain hose causes most of these failures. If the pump is humming but not moving water, a stray popcorn kernel or bit of glass is likely jamming the impeller.

WhirlpoolDishwasherSeverity: moderate90% DIY Success

Time to Fix

5–50 min

Difficulty

beginner

Parts Cost

$28 – $45

Tools Needed

Phillips #2 screwdriver, Flathead screwdriver

Whirlpool Dishwasher Won't Drain: 5 Causes Ranked

Finding a pool of dirty water after a cycle is frustrating, but on Whirlpool units it's rarely a total part failure. These machines rely heavily on a high loop in the drain hose to prevent sink water from back-flowing into the tub. Before you start buying parts, verify the drain path is clear and that hose is mounted higher than the sink drain connection. Honestly, half my service calls for this end up being a $0 fix.

Most Likely Causes

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

Filter cylinder clogged blocking pump suction40%

Drain hose without a high loop allowing back-siphoning24%

Garbage disposal knockout plug not removed after installation14%

Drain pump motor failed12%

Drain pump impeller jammed by debris10%

Symptoms You May Notice

There's an inch or more of gross standing water sitting at the bottom of the tub when you open the door after the cycle.
The display flashes F9 E1 or E1 F9 at cycle end, sometimes alternating.
You can hear the drain pump motor humming but the water level isn't dropping at all. Pump's running, water's not moving. Classic impeller jam.
Water slowly disappears over the hour after the cycle ends, just never drains during the actual cycle like it should.
Dishes smell funky or come out with a grimy film because they sat in dirty water the whole time.

Can you reset a Whirlpool dishwasher to clear the WONT-DRAIN code?

Press and hold the Cancel or Drain button for three full seconds. You should hear the drain pump kick on immediately. I use this trick to force the water out so I can work on the unit without making a mess. If the water doesn't move within two minutes, the pump is either jammed or the drain line is physically blocked.

Tools Required for Diagnosis

Phillips #2 screwdriverFlathead screwdriverMultimeter (set to ohms)Soft-bristle brush or old toothbrushTurkey baster or small plastic cupWet/dry shop vacBucket and old towels

Diagnostic Checklist

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

Did the fix not work?

If the problem comes back after following these steps, a component has permanently failed and needs replacement. Check the specific error code your dishwasher is showing:

E1 F9 Error →

ComponentComponent Under Test

Expected Range10–15 ohms

ConditionIf Open (OL) or infinite, replace component.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Drain PumpW10348269 · $28–$45	W10348269	$28 – $45

Frequently Asked Questions

How do I manually drain my Whirlpool dishwasher?

Hit the Cancel or Drain button and hold it for three full seconds. On most Whirlpool models this kicks off a two-minute drain sequence. You should hear the pump start immediately. If you hear it humming but the water level stays the same, you've got a physical blockage somewhere in the check valve or the drain hose itself, not an electrical problem. I always keep a bucket and some old towels nearby when I disconnect the hose because sometimes the blockage clears suddenly and water goes everywhere.

Is it normal to have a little water at the bottom of the dishwasher?

Yeah, a small amount of clear water sitting at the very bottom of the filter area is actually normal and fine. It keeps the pump seals from drying out and cracking. But if the water is dirty, murky, or covers the whole floor of the tub, you've got a drainage problem. Rule of thumb: if you can see water sitting above the flat mesh filter screen after the cycle finishes, start troubleshooting the drain path.

Why won't my Whirlpool dishwasher drain but there's no error code?

No error code usually means the control board thinks the drain pump ran successfully, but something physical is blocking the water. Nine times out of ten it's a jammed impeller or a clogged check valve. The check valve is a small one-way flap that sits right at the pump outlet. It's supposed to keep drained water from flowing back in, but if it gets stuck closed it blocks drainage entirely. Pull the pump, check the impeller for debris, and while you're in there poke that check valve flap and make sure it moves freely.

How much does it cost to fix a Whirlpool dishwasher that won't drain?

If it's the filter or a drain hose issue, it's basically free, just your time. Drain pump runs $40 to $70 for the part depending on your model, and it's about a 30-minute job if you've done it once before. The control board is the expensive fix, usually $150 to $250 for the part, and at that point you're weighing repair vs. replacement on an older machine. Honestly, 80% of the calls I get for this problem cost the homeowner nothing once we clean the filter and fix the hose loop.

How often should I clean the filter on my Whirlpool dishwasher?

Once a month if you run it daily. Once every six weeks if it's lighter use. Whirlpool's self-cleaning filter design from older machines got swapped out for manual-clean filters on most models built after 2010, and a lot of people don't even know they have a filter that needs cleaning. Takes two minutes. Pull it out, rinse it under hot water with a brush, put it back. Do this regularly and you'll probably never have a draining problem at all.

Related Whirlpool Dishwasher Error Codes

Code: E1 F9Whirlpool Dishwasher E1 F9 Error Code: Drain Timeout Fix

Same Fix Works on These Brands

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

Maytag washerAll Maytag Washer Error Codes: Complete Lookup Guide Maytag washerHow to Reset a Maytag Washer (3 Methods That Work)Maytag washerMaytag Washer Troubleshooting: Fix 12 Common Problems Maytag washerMaytag Washer F21: Drain Pump Clog or Failure Maytag washerMaytag F03 E01: Pressure Switch or Water Level Fault Maytag washerMaytag F0 E3 Error: Pressure Switch Malfunction

Models Known to Experience WONT-DRAIN Errors

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

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

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 14, 2026