How to Fix Water Pooling at Bottom on Samsung DW80R9950US (Built-In)

I’ve worked on Samsung’s 9950 series more times than I can count, and water pooling at the bottom is honestly one of the top three calls I get on this specific model — most of the time it comes down to a clogged filter assembly or a failing drain pump, and I can usually tell which one within the first two minutes of opening the door. The very first thing I do on every one of these is pull and inspect the triple-filter system at the bottom of the tub, because Samsung designed this model with a fine mesh that clogs faster than most homeowners expect, especially in hard-water areas. What I want you to know before you start is that this is a genuinely DIY-friendly repair — the 9950 is one of the more accessible dishwashers I work on, the components are logically laid out, and you don’t need any specialty tools to get to the parts that fail most often. Follow this guide step by step and there’s a strong chance you’ll have this fixed and running a clean test cycle before a service tech could even get to your house.

Dave Holt — Certified Appliance Repair Technician

Experience: 15+ years servicing residential & commercial appliances • Certifications: EPA 608 Certified, NATE-recognized technician • Former lead technician at a multi-state appliance service company • Specialties: Washers, dryers, refrigerators, dishwashers, ovens, microwaves, ice makers

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Water pooling at bottom

This guide covers the most common reasons water pools at the bottom of your Samsung DW80R9950US built-in dishwasher and walks you through diagnosing and fixing the problem yourself. Most homeowners with basic mechanical skills can complete this repair in 1 to 2 hours using standard household tools, saving a significant amount compared to a professional service call.

Common Symptoms & Causes

Before disassembling anything, confirm your dishwasher matches one or more of these specific symptoms:

Standing water remains at the bottom of the tub after a full cycle completes
The dishwasher displays error code 5C, OC, or OE indicating a drain fault
You hear the drain pump humming but water is not being expelled
Water has a foul odor from sitting stagnant in the sump area

The most typical root cause on the DW80R9950US is a clogged drain filter or a blocked drain hose, though a failed drain pump motor is responsible in roughly 20 percent of cases.

Safety First

Unplug the dishwasher from the wall outlet or switch off the dedicated circuit breaker before starting any work
Wear waterproof work gloves to protect against sharp metal edges inside the sump area
Photograph all wiring harness connections before disconnecting anything so you can reassemble correctly
Work in a well-lit space and place absorbent towels on the floor to catch residual water

Tools & Parts Needed

Essential Tools

Phillips head screwdriver (#2)
Torx T20 screwdriver
Needle-nose pliers
Shallow drain pan or baking sheet
Multimeter for testing pump continuity

Replacement Parts

Step-by-Step Repair Instructions

🔨 Pro Tip from Dave

On the DW80R9950US, before you assume the drain pump is dead, unplug the unit and manually rotate the pump impeller through the filter opening with a flathead screwdriver — a seized or debris-jammed impeller is frequently mistaken for a failed pump, and spinning it free costs you nothing versus a $60–$80 part. I’ve talked a lot of people off an unnecessary pump replacement with this one 30-second check.

Step 1: Remove Standing Water

Use a turkey baster or wet/dry vacuum to remove as much standing water from the tub as possible before proceeding. This prevents spills when you remove the filter assembly and makes it easier to inspect the sump area clearly. If the water is discolored or has debris floating in it, that is a strong indicator the filter is clogged.

Step 2: Clean the Drain Filter Assembly

Locate the cylindrical filter at the bottom center of the tub, turn it counterclockwise about a quarter turn, and lift it out along with the flat mesh filter beneath it. Rinse both pieces under warm running water and use a soft brush to clear any grease or food debris from the mesh. If the mesh is torn or the filter housing is cracked, replace it with part DD97-00396A.

Step 3: Inspect the Sump for Blockages

With the filter removed, shine a flashlight into the sump opening and check for broken glass, labels, or food debris blocking the drain port. Use needle-nose pliers to carefully remove any obstruction you find. Reinstall the filter, run a rinse-only cycle, and check whether the water now drains completely.

Step 4: Check the Drain Hose

Pull the dishwasher forward slightly after removing the two mounting screws under the countertop, then trace the corrugated drain hose from the pump to the sink drain or garbage disposal connection. Disconnect the hose at both ends and blow through it to confirm it is clear. A kinked or clogged hose will create significant back pressure and leave water standing in the tub every cycle.

Step 5: Test the Drain Pump Motor

If the filter and hose are both clear, the drain pump itself may have failed. Set your multimeter to the resistance setting and probe the pump motor terminals; a healthy Samsung drain pump typically reads between 10 and 30 ohms. A reading of infinite resistance or zero ohms means the motor windings have failed and the pump must be replaced with part DD31-00005A.

Step 6: Replace the Drain Pump

Disconnect the wiring harness and the hose clamps securing the pump, then rotate the pump body counterclockwise to unlock it from the sump housing. Install the new pump by aligning the tabs and rotating clockwise until it clicks firmly into place, then reconnect the hoses and wiring. Run a short wash cycle and confirm water exits fully within the drain phase, which should take approximately 90 seconds on this model.

Step 7: Verify the High Loop or Air Gap

A missing high loop in the drain hose allows water to siphon back into the tub after draining. Secure the drain hose at least 20 inches above the floor using a zip tie to a cabinet wall, or confirm the countertop air gap fitting is not clogged. This simple fix resolves recurring water pooling in many cases where the pump and filter are perfectly fine.

How Much Does This Repair Cost?

DIY parts for this repair typically run between $15 and $75 depending on what needs replacing. A replacement drain filter costs around $15 to $25, a new drain hose runs $20 to $35, and a drain pump motor averages $45 to $75. Compare that to a professional appliance service call, which generally costs $150 to $300 for parts and labor on a dishwasher drain issue, and the DIY approach saves most homeowners well over $100.

Where to Buy Replacement Parts

All three parts commonly needed for this repair are available on Amazon with fast shipping. Search for each using the links below to find compatible components for the Samsung DW80R9950US:

When to Call a Professional

Most of the repairs in this guide are within reach for a careful DIYer with basic tools. In my experience, if you’ve cleared the filter, confirmed the drain hose isn’t kinked or improperly high-looped, spun the impeller free, and the unit still won’t drain — or if you’re seeing error code 5C alongside standing water and a new pump doesn’t resolve it — that points toward a control board or wiring harness fault that genuinely warrants a certified technician, because misdiagnosing those components can turn a $150 repair into a $400 one fast. When in doubt, a diagnostic service call typically costs $80–$120 and can save you from a misdiagnosis that costs more in parts.