Whirlpool Duet Sport Washer Drain Pump Fix

Quick Answer

The drain pump is the heart of your washer's drainage system, spinning a small impeller to push water out the exit hose. If you hear a loud humming or see water sitting in the drum after a cycle, the pump is likely jammed or its motor has burnt out.

Look, ignoring a noisy drain pump is basically asking for a flooded laundry room. Worst case, the pump seizes up completely and your control board keeps throwing power at a dead motor until something burns. A pro's gonna charge you $250-$300 for this. But it's probably the easiest repair on a Duet Sport because the pump sits right behind that lower kick panel. An hour of your time, tops.

WhirlpoolWasherSeverity: highDifficulty: intermediate95% DIY Success

Time to Fix

30–60 min

Difficulty

intermediate

Parts Cost

$45 – $120

Tools Needed

1/4 inch nut driver, Phillips head screwdriver

What Does the DRAIN-PUMP Code Mean?

Most drain pumps on these front-loaders run fine for 7-10 years before the internal seals fail or the motor bushings wear out. I replaced three of these last month alone, and every time I tell the homeowner the same thing: replace the whole pump assembly, not just the motor. The plastic housing gets brittle, starts weeping water you won't even notice until it's soaked through your subfloor and you've got a real problem.

Most Likely Causes

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

Debris or foreign object blockage45%

Electrical motor failure (burnt windings)30%

Mechanical wear (impeller shaft play)15%

Leaking pump housing or seal10%

Symptoms You May Notice

Water sitting in the drum at the end of a cycle, sometimes an inch or two, sometimes practically full.
A loud grinding or humming sound that kicks in during the drain phase and then the machine just stops or throws a code.
F21 or Sud codes on the display, which is the machine's way of saying it's been trying to drain for 8 minutes and nothing's happening.
Cycle times way longer than usual as the board retries the drain over and over before finally giving up.
Drips or a small puddle on the floor right under the front of the machine, which means the pump housing has cracked or a hose connection loosened up.

Can you reset a Whirlpool washer to clear the DRAIN-PUMP code?

There's no dedicated reset button for the drain pump, but to clear an F21 or any drain-related code after you've fixed the actual problem, unplug the washer for a full 60 seconds. Plug it back in, select Drain and Spin, and let it run a complete cycle. If the code comes right back, you haven't actually fixed the root cause yet. Don't just keep clearing it and hoping it goes away.

Tools Required for Diagnosis

1/4 inch nut driverPhillips head screwdriverSlip-joint pliersMultimeterShop-vac or shallow panOld towels

Diagnostic Checklist

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

ComponentComponent Under Test

Expected Range10–20 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
Washer Drain Pump AssemblyW10130913 · $45–$120	W10130913	$45 – $120

Frequently Asked Questions

Can I just clean the pump instead of replacing it?

If the pump is jammed with a coin or debris, cleaning the filter will often fix it completely. Honestly, that's the fix probably 40% of the time. But if the pump was humming and struggling for a while before it quit, that heat damages the motor windings. If the noise comes back after you've cleaned it out, or if the impeller spins but nothing drains, you need a new pump. Cleaning buys you time, it doesn't fix a burned motor.

Is an aftermarket pump as good as the Whirlpool OEM part?

For most people, a quality aftermarket pump works fine for a few years. The OEM Whirlpool W10130913 has better seals and quieter bearings in my experience, and it's worth the extra $20-30 if you plan on keeping this machine for another 5 years. If the washer is already 12 years old and you're on the fence about replacing it anyway, the aftermarket is probably the smarter call. Just avoid the really cheap no-name ones, the impeller quality varies a lot.

Why does my washer show an F21 code?

F21 means Long Drain. The control board expected the pressure switch to signal empty within 8 minutes and it didn't happen. Almost always it's a clogged filter or a failing drain pump. Check the filter first because it takes 5 minutes and it's free. If the filter's clear and the code comes right back, you've got a pump that's on its way out. I've also seen a kinked drain hose cause this on machines that got pushed too close to the wall.

How often should I clean the drain pump filter?

Every 6 months is my standard recommendation. It takes maybe 10 minutes and it's the single best thing you can do to make the pump last longer. If you've got pets that shed, kids who forget to empty their pockets, or you're washing a ton of athletic gear, bump that up to every 3 months. The filter is right there behind that toe panel, there's really no excuse not to check it regularly once you know it's there.

What's the exact part number for the replacement pump?

The OEM part is W10130913, and that number covers most of the Duet Sport lineup from around 2006 through 2013. Before you order, pull your model number off the sticker inside the door jamb and double-check it because a few of the WFW9200 series used a slightly different pump body. The aftermarket equivalent is usually listed as AP4308966 and runs $35-45 compared to $60-80 for OEM. For a machine that's 10 or more years old, the aftermarket option is honestly fine.

Models Known to Experience DRAIN-PUMP Errors

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

WFW8300SW0, WFW8300SW1, WFW8500SR0, WFW8400TW0, WFW9200SQ0, WFW8300SW2

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 17, 2026