LG Dishwasher: not draining properly

Professional Repair Guide

What is this symptom?

Is your LG dishwasher not draining properly? You may notice water pooling at the bottom post-cycle, accompanied by strange sounds or lack of pump activity. Common issues include a clogged filter, blocked drain hose, or a faulty drain pump. Quick troubleshooting can help restore your appliance's proper function.

Urgency: Medium

Important Tips for LG Models

  • LG dishwashers may have specific drain solenoid and impeller parts that can fail and block draining; consult model-specific diagrams for part replacements.

Possible Causes

Clogged filter/trap assembly

How to Identify: Water pooling in bottom after cycle, visible debris in bottom basket or filter area.

Part: Dishwasher filter/drain trap

Blocked or kinked drain hose

How to Identify: Hose visibly bent/kinked under sink or resistant to water flow when removed; standing water persists even after filter cleaning.

Part: Drain hose

Faulty drain pump or motor assembly

How to Identify: Hearing humming without water movement, or pump fails to activate during drain cycle.

Part: Drain pump/motor

Blocked air gap or garbage disposal connection

How to Identify: Standing water and water backing up into sink, visible debris in air gap cap.

Part: Air gap/garbage disposal/connection point

Malfunctioning float switch or check valve

How to Identify: Dishwasher doesn’t recognize water level correctly or check valve sticks, water flows back.

Part: Float switch/check valve

DIY Solutions

Clean filter and drain basket

Easy 10-15 minutes
Tools Needed: gloves, soft brush, towel
  1. Remove bottom rack.
  2. Locate and remove filter and drain trap.
  3. Rinse off debris under running water and brush stubborn particles.
  4. Reinstall filters correctly and replace bottom rack.
⚠️ Safety First: Ensure dishwasher is off before working inside.

Inspect and straighten/clean drain hose

Moderate 20-40 minutes
Tools Needed: screwdriver, bucket, flashlight
  1. Turn off power to dishwasher.
  2. Access drain hose under sink or behind dishwasher.
  3. Inspect hose for kinks and straighten if necessary.
  4. Disconnect the hose (catch water in bucket) and flush with water to remove any blockages.
  5. Reconnect hose ensuring proper high loop or air-gap configuration.
⚠️ Safety First: Disconnect power and water supply.

Clear air gap or disposal connection

Easy 10 minutes
Tools Needed: screwdriver, brush
  1. Remove air gap cap and clean interior of debris.
  2. Ensure disposal is clear by running it with water.
  3. Check drain hose connection to disposal for obstructions.
⚠️ Safety First: Turn off disposal power before inspecting.

Next step

Choose the next step for not draining properly

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

Most relevant component to inspect

Dishwasher Filter

Screens food debris from recirculating wash water and protects the pump system.

Typical part-only price
$15 - $65
DIY difficulty
Easy
Estimated time
5-15 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Other parts options

Check related components first; use model search as a fallback.

Possible related component

Drain Hose

Carries waste water from the drain pump to your home's standpipe or sink drain.

$15 - $30 · Easy · 15-30 mins

Check fit & price
Possible related component

Drain Pump

Pumps waste water out of the appliance during the drain cycle.

$35 - $80 · Easy · 15-30 mins

Check fit & price
Possible related component

Float Switch

Detects the maximum water level to prevent overflow and potential flooding.

$15 - $40 · Easy · 10-20 mins

Check fit & price
Model number required

Model-compatible Dishwasher parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.

Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Dishwasher Cleaner and Descaler

Supports routine removal of mineral scale, grease, and odor. It is maintenance, not a repair for a failed pump, valve, or control.

View maintenance supply
Maintenance supply

Braided Dishwasher Inlet Hose

For replacement of an externally damaged supply hose. Verify connection size, length, and appliance installation requirements before ordering.

View maintenance supply

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Professional Repairs

Replace drain pump or motor assembly

Estimated Cost: $80 - $180

Replace drain hose or check valve

Estimated Cost: $30 - $100

Replace malfunctioning float switch

Estimated Cost: $30 - $80

When to Call a Professional

Drain pump hums but no water moves and DIY clears not successful
Internal component tests require multimeter or are inconclusive
Leaks occur after attempted DIY fixes

Preventive Maintenance

  • Clean filter and drain area: Clogs that lead to drainage issues
    Frequency: monthly
  • Inspect drain hose routing: Kinks or improper hose positioning
    Frequency: annually

Frequently Asked Questions

Why is my LG Dishwasher not draining properly?
The top causes include clogged filters, blocked drain hoses, or a faulty drain pump.
How do I fix LG Dishwasher not draining properly myself?
Clean the filter, inspect the drain hose for kinks, and clear any blockages in the air gap or disposal.
How much does it cost to fix not draining properly?
Professional repairs range from $30 to $180 depending on the issue, like pump or hose replacements.
When should I call a technician for not draining properly?
If DIY solutions fail or if you suspect a more complex issue, it's time to call a professional.

Community Analytical Insights

Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions

Common Issues Reported by Users

  • Clogged drain filter or drain hose
  • Faulty drain pump
  • Kinked or blocked drain hose
  • Improper installation or height of drain hose
  • Malfunctioning check valve

User Suggested Solutions

  1. Check and clean the drain filter and drain hose. Remove any debris or buildup that may be obstructing water flow. Ensure the hose is not kinked.

  2. Inspect the drain pump for blockages or failure. If the pump is not functioning, it may need to be replaced.

  3. Check the installation of the drain hose to ensure it is properly positioned and not too low, which can cause siphoning issues.

  4. Examine the check valve for proper operation. If it is stuck or damaged, it may need to be replaced.

Limited-source guidance; percentages and success-rate claims are not shown
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Dishwasher tub fills with water when running the sinks water

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