Bosch Washer Drain Pump Motor Assembly Parts — Models & Compatibility

When your Bosch front-load washer won't drain or throws an E13 error code, you're likely dealing with a failed drain pump motor assembly. This hub covers the 436440 replacement pump that fits over 50 Bosch, Thermador, and Gaggenau washer models. Whether you're seeing standing water at the end of a cycle or hearing unusual grinding noises, this is the OEM-quality part that solves it.

Is This the Right Part for Your Model?

Check your washer's model number before ordering. On Bosch front-loaders, you'll find the model plate inside the door frame or on the left side panel near the bottom. Compare your model number against the compatibility list below — this pump fits the WFMC, WFMB, WAW, WAS, and other series manufactured between 2010-2020.

About This Replacement Part

The drain pump motor assembly (part number 436440, replaces 00436440, 00674704, 00703146) typically fails due to worn bushings on the impeller or blockage from foreign objects like coins or small socks. When it goes bad, you'll see standing water in the drum, hear grinding or humming sounds during the drain cycle, or get that mysterious E13 error code that's not even mentioned in your owner's manual. The repair takes 30-60 minutes and requires working through a small 6-inch circular access panel at the front — it's doable for a determined DIYer, but you'll need patience and possibly some creative contortion. After installation, unplug the washer for 60 seconds to reset the control board if a new error code pops up.

Common Symptoms That Point to This Part

Your Bosch is telling you the drain pump needs replacement when water stays in the tub after the spin cycle completes, the washer stops mid-cycle with standing water, or you hear a loud humming noise but no water movement during drain. That E13 error code is Bosch's way of saying the pump can't evacuate water properly — usually because the impeller bushings have worn down or something's jammed in the housing.

What You'll Need for Installation

Gather pliers, screwdrivers, and a socket set before you start. The trickiest part isn't removing the old pump — it's working through that tiny access panel. The suction hose clamp is particularly difficult to reach and manipulate with one hand, so have needle-nose pliers ready. Plan for 45 minutes if you're mechanically inclined, closer to an hour if this is your first time accessing the pump chamber.

Compatible Bosch Washer Models

This 436440 drain pump motor assembly fits the following Bosch, Thermador, and Gaggenau washing machine models:

• WFMB3200UC
• WFMC1001UC
• WFMC2100UC
• WFMC2201UC
• WFMC220BUC
• WFMC220RUC
• WFMC3200UC
• WFMC3301UC
• WFMC330SUC
• WFMC4300UC
• WFMC4301UC
• WFMC5301UC
• WFMC530CUC
• WFMC530SUC
• WFMC5440UC
• WFMC544SUC
• WFMC5801UC
• WFMC6400UC
• WAW28460UC
• WAW32560UC

If your model number isn't listed here, check the full compatibility chart on the product page or contact us with your complete model number for verification.

Why Choose This OEM-Quality Replacement

At $57.99, this isn't the cheapest pump you'll find online, but it's the one that'll actually last. Cheaper aftermarket versions often use inferior bushings that wear out in months instead of years. This pump matches the original Bosch specifications and includes the motor assembly, impeller, and housing — everything you need for a complete repair. Plus, it replaces multiple part numbers (00436440, 00674704, 00703146, AP3764202, PS3464593), so you know it's the updated, improved version Bosch designed to fix the issues with earlier pumps.