LG Dishwasher Not Draining? Troubleshooting Guide

Standing water in your LG dishwasher after a cycle is one of the most common issues homeowners face. If you’ve opened your dishwasher to find a pool of dirty water at the bottom, you’re not alone. The good news? Many drainage problems can be diagnosed and sometimes fixed without calling a repair technician.

Let’s walk through the most common causes and solutions for an LG dishwasher that won’t drain properly.

Check the Basics First

Before diving into more complex troubleshooting, start with these simple checks:

Is the cycle actually complete? This sounds obvious, but LG dishwashers sometimes pause mid-cycle due to power interruptions or door openings. Press the start button or run a rinse cycle to see if it drains normally.

Check your garbage disposal. If your dishwasher drain hose connects to a garbage disposal (which is common in Grand Rapids-area homes), make sure the disposal is clear and running properly. A clogged disposal will prevent your dishwasher from draining. If you recently installed a new disposal, verify that the drain plug was removed from the dishwasher inlet.

Inspect the drain hose. Look under your sink where the drain hose connects. Make sure the hose isn’t kinked, pinched, or positioned too high. The drain hose should have a high loop (to prevent backflow) but shouldn’t be higher than about 20 inches from the floor.

Common Causes of LG Dishwasher Drainage Problems

1. Clogged Filter Assembly

The filter assembly is the most frequent culprit. LG dishwashers have a cylindrical filter and a flat fine mesh filter at the bottom of the tub. Over time, food particles, broken glass, and debris accumulate here.

How to clean it:

• Remove the lower dish rack
• Turn the cylindrical filter counterclockwise and lift out
• Remove the flat fine filter underneath
• Rinse both thoroughly under hot water
• Use a soft brush to remove stubborn debris
• Reinstall in reverse order

In my experience serving West Michigan homeowners, I’ve found that cleaning the filter solves about 40% of drainage issues. LG recommends cleaning these filters monthly, though most people do it far less frequently.

2. Blocked Drain Pump or Sump Area

Even with clean filters, debris can bypass them and lodge in the sump area or drain pump. Common culprits include toothpicks, bottle caps, small pieces of broken dishes, and fruit stickers.

To check the sump:

• Remove the filter assembly
• Use a flashlight to look into the sump opening
• Carefully remove any visible debris with needle-nose pliers or your fingers (wear gloves)
• Check for standing water that won’t drain even when you scoop it out

If you hear grinding or buzzing during the drain cycle but water remains, there’s likely an obstruction in the drain pump itself.

3. Faulty Drain Pump

LG dishwashers use a drain pump that typically lasts 5-10 years. If the pump motor fails or the impeller breaks, your dishwasher won’t drain regardless of how clean everything else is.

Signs of a bad drain pump:

• Complete silence during the drain cycle
• Humming or buzzing without any water movement
• Error codes like OE or nE on the display
• Burning smell from the bottom of the dishwasher

Testing the drain pump requires checking for continuity with a multimeter. The pump is located under the dishwasher and typically costs $80-150 for the part, plus $150-250 for professional installation. For a DIY-inclined homeowner, replacing it is possible but requires accessing the bottom of the unit.

4. Clogged or Faulty Drain Hose

The drain hose can develop clogs, especially where it connects to the pump or disposal. Over time, grease and food particles create a gunky buildup.

Inspection steps:

• Disconnect power to the dishwasher
• Pull the dishwasher out from under the counter (you may need help)
• Disconnect the drain hose from the pump and sink connection
• Run water through it or use a plumber’s snake if needed
• Check for cracks or holes that might cause leaks

Replacement drain hoses for LG dishwashers cost $15-30 and are straightforward to install if you’re comfortable with basic repairs.

5. Malfunctioning Check Valve

The check valve prevents water from flowing back into the dishwasher after draining. If it’s stuck or broken, you might see proper drainage initially, but then water returns to the tub.

This valve is located in the drain pump assembly. If you’ve already accessed the pump to check for clogs and noticed the flap doesn’t move freely, the check valve may need replacement. This is often included in a full drain pump assembly replacement.

LG-Specific Error Codes

LG dishwashers display helpful error codes when drainage issues occur:

OE (sometimes displayed as 0E): This is the most common drainage error. It means the dishwasher hasn’t drained within a specific time frame. Start with filter cleaning and work through the troubleshooting steps above.

nE or 1E: These indicate the dishwasher isn’t filling properly, but drainage issues can trigger these codes if the unit can’t drain before attempting to refill.

FE: This error means the dishwasher is overfilling, sometimes caused by a drainage problem that prevents proper water level sensing.

When to Call a Professional

Some drainage issues require professional diagnosis and repair:

• Control board problems: If the dishwasher isn’t sending power to the drain pump, the electronic control board may be faulty
• Drain pump replacement: While possible for DIYers, this requires pulling the dishwasher out and working in tight spaces
• Persistent issues after troubleshooting: If you’ve tried everything and still have standing water
• Multiple error codes: Complex issues affecting several systems

For homeowners in Grand Rapids and surrounding areas, professional drain pump replacement typically runs $200-350 including parts and labor, depending on the specific LG model.

Preventive Maintenance Tips

Keep your LG dishwasher draining properly with these habits:

• Scrape dishes before loading (but don’t pre-rinse completely—modern dishwashers need some food particles for detergent effectiveness)
• Clean the filter monthly
• Run hot water at the sink before starting the dishwasher to ensure hot water reaches the unit
• Use dishwasher cleaner every few months to prevent buildup
• Check the spray arms occasionally for clogs

Still Having Drainage Issues?

If you’ve worked through these troubleshooting steps and your LG dishwasher still won’t drain, or if you’d prefer to have a professional diagnose and fix the problem, HomeHalo Appliance Repair serves the Grand Rapids and West Michigan area with honest, reliable service. We stock common LG parts and can typically diagnose drainage issues in one visit.

Give us a call at (616) 367-5131 to schedule an appointment. We’ll get your dishes clean and your dishwasher draining properly again.