Samsung Washer Drain Pump Motor Parts — WA4, WA5, WF2, WF3, WF4, WF5 Series Compatibility

Your Samsung front-loader finishes the wash cycle but the water just sits there — basket full, door locked, clothes soaking. That's the drain pump motor failing to evacuate water, and it's one of the most common repair needs across Samsung's WA4, WA5, WF2, WF3, WF4, and WF5 series washers. The DC31-00178A pump motor is the direct replacement that restores proper drainage across dozens of Samsung models from the mid-2010s forward.

Is This the Right Part for Your Model?

Check your washer's model number — it's typically on a silver sticker inside the door frame or on the back panel. If you've got a WF42H, WF45H, WA45H, WA48J, or WA50K series machine, this pump motor fits. The part replaces older numbers DC31-00187A, DC31-00178D, and PX3516-01, so if you're cross-referencing repair guides or old invoices, those are all the same component. Samsung used this pump design across their top-load and front-load models during a five-year production run, which means parts availability is solid and the replacement procedure is well-documented.

About This Replacement Drain Pump Motor

The DC31-00178A is the actual motor assembly that drives the drain impeller — it mounts directly to the pump housing and spins the blade that pushes water out through the drain hose. When it fails, the primary symptom is simple: the washer won't drain. You'll hear the motor trying to hum or you'll hear nothing at all, but water stays in the tub. This isn't a gradual failure — one cycle it works, the next it doesn't. The motor windings burn out or the internal capacitor fails, and there's no repair option short of replacing the entire motor unit.

Compatible Samsung Washer Models

This pump motor fits the following Samsung washer model numbers. Verify your exact model before ordering:

• WF42H5000AW/A2 — Front-load washer
• WF42H5200AW/A2 — Front-load washer
• WF42H5200AP/A2 — Front-load washer
• WF42H5200AF/A2 — Front-load washer
• WF42H5400AW/A2 — Front-load washer
• WF42H5400AF/A2 — Front-load washer
• WF42H5500AF/A2 — Front-load washer
• WA45H7000AW/A2 — Top-load washer
• WA45K7600AW/A2 — Top-load washer
• WA48J7700AW/A2 — Top-load washer
• WA48J7770AW/A2 — Top-load washer
• WA48J7770AP/A2 — Top-load washer
• WA50K8600AV/A2 — Top-load washer

Why This Part Fails

Drain pump motors work hard every single cycle. They're spinning against water resistance, dealing with lint and debris that makes it past the filter, and handling voltage fluctuations from your home electrical system. Over three to five years, the motor brushes wear down or the bearings seize. You might notice the washer taking longer to drain before it fails completely, or you might just get an error code one day — Samsung displays an ND or 5E code when the drain pump circuit doesn't respond as expected.

What You're Actually Replacing

You're not replacing the entire drain pump assembly — just the motor that drives it. The housing, impeller, and drain connections stay in place. You'll disconnect the wire harness, unbolt the old motor from the pump housing, transfer it to the new unit, and reconnect. It's a 30-45 minute job if you've got basic tools and can access the bottom or rear panel of your washer. Front-loaders typically require tipping the machine back; top-loaders need rear panel removal.

Order Your Replacement Pump Motor

The DC31-00178A is in stock and ready to ship. Verify your model number against the compatibility list above, and you'll have the right part the first time. This is the OEM-equivalent motor used across Samsung's most popular washer lines from 2013-2018, so fitment is exact and performance matches the original equipment.