LG Dishwasher: flashing lights, not draining

Professional Repair Guide

What is this symptom?

If your LG dishwasher is displaying flashing lights and not draining, it may indicate a problem with the drain system. This issue often leaves standing water in the tub, preventing normal operation. Common causes include clogged filters, blocked drain hoses, and faulty pumps. Understanding these symptoms can help you address the issue quickly.

Urgency: Medium

Important Tips for LG Models

  • LG dishwashers display error codes (e.g., OE) that specifically indicate drain issues; consult manual for model-specific patterns.

Possible Causes

Clogged filter or drain path

How to Identify: Standing water remains after cycle; OE error code or flashing lights; visible debris around filter area

Part: Dishwasher filter and drain path

Blocked or kinked drain hose

How to Identify: Standing water persists; drain hose kinked or clogged; water doesn’t flow into sink/garbage disposal

Part: Drain hose

Faulty or obstructed drain pump

How to Identify: Humming sound during drain cycle but no water exits; power present at pump but not spinning; impeller jam or damage

Part: Drain pump

Faulty control board not actuating drain cycle

How to Identify: No attempt to drain; lights flash but no drain cycle engages

Part: Main control board

Flashing lights signaling error or other component fault

How to Identify: Lights flash without specific drain attempts; may represent other errors like door latch or control board issues

Part: Control/display/interface/error indicators

DIY Solutions

Clean filter and clear debris in drain area

Easy 10–20 minutes
Tools Needed: gloves, towel
  1. Turn off dishwasher and open the door
  2. Remove bottom rack and locate the filter
  3. Twist and lift filter assembly and rinse under running water
  4. Clear any debris from filter housing and drain area
  5. Reassemble filter and run a short cycle to test draining
⚠️ Safety First: Always disconnect power before servicing

Inspect and clear drain hose

Moderate 15–30 minutes
Tools Needed: screwdriver, bucket, flashlight
  1. Turn off dishwasher power
  2. Access the drain hose at back of dishwasher
  3. Check for kinks or visible blockages
  4. Disconnect hose and flush with water to clear debris
  5. Reattach hose ensuring no kinks and test drain cycle
⚠️ Safety First: Keep towels and bucket ready for water spills

Reset control panel to clear temporary errors

Easy 5 minutes
  1. Turn off dishwasher at circuit breaker or unplug
  2. Wait 1–2 minutes
  3. Restore power and attempt to run a cycle

Next step

Choose the next step for flashing lights, not draining

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

Main Control Board

The central brain of the appliance that controls all components, cycles, and timings.

$120 - $280 · Medium · 20-40 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 impeller

Estimated Cost: $80–$200

Control board replacement

Estimated Cost: $150–$350

When to Call a Professional

If water remains after clearing filters and hoses
If the drain pump hums but won’t spin and requires disassembly
If control board fault suspected after basic troubleshooting

Preventive Maintenance

  • Clean filters regularly: Clogs and drainage problems
    Frequency: monthly
  • Inspect drain hose for kinks or blockages: Drain failures
    Frequency: every 3–6 months

Frequently Asked Questions

Why is my LG Dishwasher flashing lights, not draining?
Common causes include clogged filters, blocked drain hoses, and faulty drain pumps.
How do I fix LG Dishwasher flashing lights, not draining myself?
Start by cleaning the filter, inspecting the drain hose for kinks, and resetting the control panel.
How much does it cost to fix flashing lights, not draining?
Professional repairs can cost between $80-$200 for a drain pump or $150-$350 for a control board replacement.
When should I call a technician for flashing lights, not draining?
If DIY solutions don't resolve the issue or if you're uncomfortable with repairs, it's time to call a technician.

References & Sources

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
  • Malfunctioning control board

User Suggested Solutions

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

  2. Test the drain pump for functionality. If it is not working, it may need to be replaced. Disconnect power, remove the pump, and check for blockages or damage.

  3. Inspect the control board for any signs of damage or burnt components. If the board is faulty, it will need to be replaced. This may require professional assistance.

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. LG Dishwasher Flashing Lights

Community Discussions

flashing lights, clicking noise, quits running mid cycle, water sitting in bottom

Replace the control panel

Pro needed View on Reddit →

Source: Reddit r/appliancerepair

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