LG Dishwasher Not Draining — 7 Causes & How to Fix EAU62043403

You open your LG dishwasher after the cycle finishes, and there's a pool of dirty water sitting at the bottom. The dishes are still grimy, and that standing water isn't going anywhere. If you're dealing with an LDF7774ST, LDT9965BD, or any of the LG models using the EAU62043403 drain pump assembly, you're looking at one of seven possible causes — and most of them you can diagnose yourself in about 15 minutes.

The drain pump motor assembly (EAU62043403, which replaces EAU62043401 and EAU60710801) is the muscle that pushes water out of your dishwasher. When it fails or gets blocked, you'll know immediately — because that water has nowhere to go.

Quick Symptom Check

Before you pull the dishwasher out, verify what you're actually dealing with:

• Standing water in the tub: Water remains at the bottom after cycle completes
• Humming but not draining: You hear the pump trying to work, but water stays put
• Complete silence during drain: No pump noise at all when it should be draining
• Intermittent draining: Sometimes drains, sometimes doesn't
• Slow drainage: Takes significantly longer than normal, or doesn't fully empty
• Error codes: OE, LE, or FE flashing on the display

Cause #1: Clogged Drain Filter (60% of Cases)

This is almost always the first stop. The drain filter on LG dishwashers (located at the bottom of the tub) catches food debris, and when it's clogged, water can't reach the pump.

How to check:

1. Remove the lower dish rack
2. Twist and remove the cylindrical filter assembly counterclockwise
3. Pull out the fine mesh screen underneath
4. Inspect for food particles, grease buildup, small bones, or glass shards

The fix: Rinse both filters under hot water. Use a soft brush for stubborn grease. If the mesh is damaged or warped, you'll need a new filter assembly. This solves the problem about 60% of the time.

Cost: $0 (cleaning) or $15-25 (replacement filter)

Cause #2: Blocked Drain Pump Impeller (25% of Cases)

Even with a clean filter, small debris can slip past and jam the pump impeller. Toothpicks, bottle caps, twist ties, and fruit pits are common culprits in the LDF7551ST and LDS5774ST models.

How to check:

1. Remove the filter assembly
2. Look into the sump area with a flashlight
3. Try to manually spin the impeller with your finger (it should rotate freely)
4. If it's stuck or gritty, there's a blockage

The fix: Remove any visible debris. Sometimes you'll need to remove the pump assembly (EAU62043403) to fully clear the blockage. If the impeller blades are broken or the motor won't spin freely after cleaning, replacement is necessary.

Cost: $0 (if just debris) or $92.99 (pump replacement)

Cause #3: Failed Drain Pump Motor (10% of Cases)

The EAU62043403 pump motor has a limited lifespan — typically 8-12 years. High mineral content in your water can accelerate wear. If you hear humming but no water movement, or complete silence when the drain cycle starts, the motor's likely burned out.

How to check:

1. Start a drain cycle and listen carefully
2. No sound = electrical failure or bad motor
3. Humming without draining = seized impeller or weak motor
4. Use a multimeter to test for continuity across the pump terminals (should read 50-150 ohms)

The fix: Replace the entire pump assembly. This isn't a rebuild situation — the EAU62043403 comes as a complete unit. Compatible with LDF7774BD, LDF8072ST, LDF8764ST, and dozens of other models.

Cost: $92.99 (part) + $150-200 (professional install) or DIY in 45 minutes

Cause #4: Kinked or Clogged Drain Hose (3% of Cases)

The drain hose runs from the pump to your sink drain or garbage disposal. If it's kinked, clogged with grease buildup, or installed incorrectly, water backs up into the dishwasher.

How to check:

1. Pull the dishwasher forward slightly
2. Trace the drain hose from the pump to the disposal/drain
3. Look for sharp bends or kinks
4. Disconnect at the disposal and blow through it — should have free airflow

The fix: Straighten kinks. If clogged, disconnect and flush with hot water. Make sure the hose creates a high loop (higher than the water level in the tub) to prevent backflow.

Cost: $0 (repositioning) or $10-15 (new hose)

Cause #5: Garbage Disposal Knockout Plug Not Removed

If your LG dishwasher was recently installed and has never drained properly, there's a 50/50 chance the installer forgot to remove the knockout plug from a new garbage disposal. This plastic plug blocks the drain inlet.

How to check:

1. Disconnect the drain hose from the garbage disposal inlet
2. Look inside the disposal inlet with a flashlight
3. If you see a solid plastic plug, that's your problem

The fix: Use a screwdriver and hammer to punch out the plug from inside the disposal. Retrieve the plug piece so it doesn't clog your drain. This is a one-time fix that takes 5 minutes.

Cost: $0

Cause #6: Faulty Drain Pump Wiring or Connector

The wire harness connector to the EAU62043403 pump can corrode or come loose, especially in humid environments. This is more common in the LSDF9969BD and UPDF9894ST models with electronic controls.

How to check:

1. Disconnect power
2. Access the pump (usually requires removing the lower panel)
3. Inspect the wire connector for corrosion, burn marks, or looseness
4. Wiggle the connector — if the pump kicks on, that's your issue

The fix: Clean corrosion with electrical contact cleaner. If wires are damaged, repair or replace the harness. Make sure the connector clicks firmly into place.

Cost: $0-35 (depending on harness damage)

Cause #7: Control Board Drain Relay Failure

Least common but still possible — the main control board's drain pump relay can fail. You'll have power to the machine, all other functions work, but the drain pump never gets the signal to run.

How to check:

1. This requires a multimeter and the wiring diagram
2. Test for voltage at the pump connector during drain cycle
3. If there's no voltage but the pump is good, the board's not sending power

The fix: Control board replacement. This is typically a professional job unless you're comfortable with wiring diagrams and safety protocols around 120V circuits.

Cost: $150-300 (board) + $100-150 (install)

When to Call a Pro

If you've cleaned the filter, checked for blockages, tested the pump, and confirmed the hose is clear — but the dishwasher still won't drain — it's time for a technician. Control board diagnostics and certain pump access procedures require special tools and training. Also call if you see water leaking from the pump area during operation, which could indicate a seal failure or cracked housing.

Most service calls for LG dishwasher drain issues run $125-175 for diagnosis, plus parts. Given that the EAU62043403 pump assembly costs $92.99 and takes about 45 minutes to replace yourself, you're looking at significant savings if it's just the pump.

Frequently Asked Questions

How long does the EAU62043403 drain pump typically last?

The average lifespan is 8-12 years with normal use. Hard water areas may see failures closer to 6-7 years due to mineral buildup on the impeller. Running the dishwasher regularly (at least twice a week) actually extends pump life because it prevents seals from drying out.

Can I use my LG dishwasher if it's not draining completely?

You shouldn't. Standing water breeds bacteria and creates odors. More importantly, if water can't drain, it can't refill properly for the next cycle, meaning dishes won't get clean. Continuing to run it risks overworking the pump motor and potentially causing a leak if the tub overfills.

Is the EAU62043403 compatible with Kenmore Elite dishwashers?

Yes — Kenmore models 72214697610 and 72214693610 (among others) use this exact pump assembly. Kenmore dishwashers in the 722-series are manufactured by LG and share most internal components, including the drain pump. Just verify your model number against the compatibility list before ordering.