Samsung Dishwasher Won't Drain — 5 Causes & How to Fix DD31-00016A

You open your Samsung dishwasher after the cycle finishes, and instead of clean, dry dishes, you're staring at a pool of murky water at the bottom. The control panel says the cycle's done, but clearly something didn't get the memo. Standing water in your dishwasher isn't just annoying — it's a breeding ground for bacteria and usually means your drain pump or drain system has failed.

This is one of the most common failures across Samsung's DW80 series, including models like the DW80B6060US, DW80B7070US, and DW80H9930MO. The good news? Most drainage issues come down to five fixable causes, and you can diagnose most of them without pulling the dishwasher out of the cabinet.

Quick Symptom Check

Before you start disassembling anything, confirm what you're dealing with:

• Standing water remains after cycle: Water sits at the bottom, usually 1-3 inches deep
• Drain pump runs but doesn't drain: You hear the motor but water stays put
• No drain pump sound at all: Complete silence during drain cycle
• Slow drainage: Takes 10+ minutes to drain or never fully empties
• Error codes: Samsung displays codes like 5E, SE, 5C, or OE
• Gurgling sounds from sink: Indicates drain line or air gap issues

Cause #1: Failed Drain Pump Motor (Most Likely)

The drain pump motor (part DD31-00016A) is the heart of your dishwasher's drainage system, and it's the most common failure point. These pumps typically last 5-8 years, but hard water, detergent buildup, and debris can kill them sooner.

Probability: 60% of no-drain issues

How to diagnose:

1. Start a drain cycle and listen carefully at the bottom left of the dishwasher
2. If you hear nothing — no hum, no buzz, no clicking — the pump motor's likely dead
3. If you hear a hum but no water movement, the motor's seized or the impeller's jammed
4. Remove the lower spray arm and filter assembly to access the sump area
5. Check for standing water — bail it out with a cup and sponge
6. Remove the pump cover (usually 3-4 screws) and inspect the impeller
7. Try spinning the impeller by hand — it should rotate freely with slight resistance

The fix: If the motor's dead or the impeller won't spin, you need a new drain pump assembly. The DD31-00016A is a direct replacement that works across dozens of Samsung models including the DW80B6061UG, DW80B7071US, and DW60M9990AP. Budget $145.99 for the part plus 45-60 minutes for installation if you're doing it yourself.

Cause #2: Clogged Drain Pump or Filter

Before the pump fails mechanically, it often gets choked with debris. Popcorn kernels, broken glass, fruit stickers, and shredded food labels are the usual suspects. Even small items can jam the impeller and prevent drainage.

Probability: 25% of no-drain issues

How to diagnose:

1. Remove the bottom dish rack completely
2. Unscrew and lift out the cylindrical filter assembly (turns counterclockwise on most models)
3. Remove the flat fine mesh filter beneath it
4. Look into the sump opening with a flashlight — you're checking for debris around the impeller
5. Feel around the impeller area carefully (gloves recommended) for small objects

The fix: Clean everything thoroughly. Rinse the filters under hot running water, scrub with an old toothbrush if there's buildup. Remove any debris from the sump. If the impeller was jammed but spins freely now, reassemble and test a drain cycle. This fix costs nothing but 15 minutes of your time.

Cause #3: Blocked or Kinked Drain Hose

Your drain pump can be perfect, but if the water has nowhere to go, you'll still have standing water. The drain hose runs from the pump to either your garbage disposal or a standpipe under your sink.

Probability: 10% of no-drain issues

How to diagnose:

1. Pull the dishwasher forward slightly (turn off power first at the breaker)
2. Follow the drain hose from the pump connection to where it connects under the sink
3. Check for kinks, especially in the first 12 inches where the hose makes a turn
4. Disconnect the hose at the sink end (bucket ready — water will spill)
5. Blow through the hose or run water through it to check for clogs
6. Inspect the connection point at your garbage disposal — the knockout plug must be removed if it's a new disposal

The fix: Straighten kinked hoses. Replace hoses with cracks or internal buildup. Clear the disposal connection. If your disposal's knockout plug wasn't removed during installation, you've found your problem — pop it out with a screwdriver and hammer.

Cause #4: Faulty Check Valve

The check valve is a small flapper that prevents dirty drain water from flowing back into the clean dishwasher. When it sticks closed, water can't drain out. When it sticks open, you might get backflow.

Probability: 3% of no-drain issues

How to diagnose:

1. Access the check valve by removing the pump assembly (you're already this deep if you've checked the pump)
2. The valve is usually a small rubber flap or ball mechanism at the pump outlet
3. Make sure it moves freely and isn't stuck with mineral deposits or detergent buildup
4. Check for cracks in the rubber — hard water makes them brittle over time

The fix: Clean the valve mechanism with white vinegar to dissolve mineral deposits. If it's cracked or won't move freely after cleaning, the entire drain pump assembly (DD31-00016A) needs replacement — the check valve isn't sold separately on most Samsung models.

Cause #5: Control Board or Wiring Issue

Rarely, the drain pump is fine but it's not getting the signal to run. This happens when the control board fails or when wire connections corrode.

Probability: 2% of no-drain issues

How to diagnose:

1. Listen during the drain cycle — if other functions work but the drain pump never activates, suspect electrical issues
2. Check the wire harness connection at the pump — look for corrosion or loose terminals
3. Use a multimeter to test for voltage at the pump connection during drain cycle (should read 120V AC)
4. If there's no voltage, trace wires back to the control board looking for breaks or burns

The fix: Reconnect loose wiring. Clean corroded terminals with electrical contact cleaner. If the control board's sending no signal and all connections are good, you're looking at a $200-$400 control board replacement — but verify everything else first because this is expensive and rarely the actual cause.

When to Call a Pro

Most drain pump replacements are straightforward DIY jobs. But call a professional if:

• You're not comfortable working with electrical connections or turning off breakers
• Your dishwasher is still under warranty (DIY work might void it)
• You've replaced the pump but still have drainage issues
• You suspect main control board failure
• Water is leaking from places other than the door seal during diagnosis

A service call typically runs $150-$200 for diagnosis plus parts and labor. Given the DD31-00016A pump costs $145.99 and takes under an hour to install, DIY saves you $100-$150 in labor if you're comfortable with basic repairs.

Frequently Asked Questions

How long should a Samsung dishwasher drain pump last?

Most Samsung drain pumps last 5-8 years with normal use. Hard water areas see shorter lifespans — sometimes as little as 3-4 years — because mineral deposits accelerate wear on the impeller and seals. Running your dishwasher regularly (at least twice a week) actually extends pump life compared to letting it sit unused, since seals stay lubricated.

Can I test the drain pump without removing it?

Yes, partially. Start a drain cycle and listen — you should hear the pump motor engage within 60 seconds. Place your hand on the lower left side of the dishwasher tub and feel for vibration. If you hear humming but no vibration and no drainage, the motor's running but the impeller's likely jammed or broken. Complete silence means electrical failure or a dead motor. For thorough testing, though, you need to access the pump directly.

Will the DD31-00016A work on older Samsung models?

The DD31-00016A is compatible with Samsung dishwashers manufactured from approximately 2015 to current production, including the DW80 series like DW80B6060UG, DW80B7070AP, and DW80H9930MO. It replaces older part numbers AP5917178, PS9606350, and 4000925. Check your model number against the compatibility list — Samsung made several different pump designs over the years, and older pre-2015 models may use different mounting configurations that won't accept this pump.