Lg Dishwasher: overfilling, slow draining

Professional Repair Guide

What is this symptom?

Is your LG dishwasher overfilling and draining slowly? This common issue often leads to water pooling at the bottom and may cause spills during operation. Potential causes include clogged filters, a stuck float switch, or a kinked drain hose. Understanding these problems is the first step to a solution.

Urgency: Medium

Important Tips for Lg Models

LG dishwashers may overflow due to float switch or control board powering inlet valve too long

Possible Causes

Clogged filters or debris in drain path

How to Identify: Standing water after cycle, debris visible in filter/drawer, slow drainage

Part: Filter, drain path

Faulty or stuck float switch

How to Identify: Float doesnâ€™t move freely, high water continues filling, symptoms of overfilling independent of clogs

Part: Float switch

Malfunctioning water inlet valve or control board powering inlet too long

How to Identify: Water continues to fill beyond expected fill time, possible electronic control faults

Part: Water inlet valve, control board

Kinked or obstructed drain hose

How to Identify: Visual kink or bend in hose, slow drainage despite clean filter

Part: Drain hose

DIY Solutions

Clean filter and drain path

Easy 10-20 minutes

Tools Needed: gloves, soft brush, container for water

Disconnect power and open dishwasher.
Remove bottom rack and take out the filter assembly.
Inspect and remove debris in filter and drain area.
Rinse filter under running water and use a soft brush to clear trapped particles.
Replace filter, restore rack, run short rinse cycle to test drainage.

⚠️ Safety First: Ensure power off before working inside dishwasher

Check and free float switch

Moderate 10-30 minutes

Tools Needed: screwdriver, multimeter (optional)

Turn off dishwasher power.
Locate float assembly at base of dishwasher.
Manually move float to ensure it moves freely and isnâ€™t stuck.
If stuck, clean area around float to allow free motion.
Optional: test float switch continuity with multimeter.
Restore power and test cycle.

⚠️ Safety First: Power off before inspection

Inspect and straighten drain hose

Moderate 15-30 minutes

Tools Needed: wrench, flashlight

Turn off water and power.
Locate drain hose under sink.
Check for kinks or bends and straighten hose.
Reconnect securely and test with rinse cycle.
If hose is clogged, detach and flush with water to clear obstruction.

⚠️ Safety First: Have bucket/towel for water when detaching hose

Professional Repairs

Replace float switch

Estimated Cost: $30 - $80 for part plus labor

Replace water inlet valve or control board

Estimated Cost: $100 - $300 for valve; $200 - $600 for control board plus labor

When to Call a Professional

If DIY cleaning and float check do not resolve issues

When electrical components (inlet valve, control board) are suspected

If drain hose replacement or major disassembly is needed

Preventive Maintenance

Clean filter and drain area: Slow draining and clogs
Frequency: weekly or biweekly
Inspect drain hose routing: Kinks causing drainage issues
Frequency: monthly

Frequently Asked Questions

Why is my LG Dishwasher overfilling, slow draining?

Common causes include clogged filters, a stuck float switch, or a kinked drain hose.

How do I fix LG Dishwasher overfilling, slow draining myself?

You can clean the filter, check the float switch, and inspect the drain hose for kinks.

How much does it cost to fix overfilling, slow draining?

Professional repairs can range from $30-$600 depending on parts like the float switch or control board.

When should I call a technician for overfilling, slow draining?

If DIY solutions don't work or you're uncomfortable with repairs, it's best to call a technician.

References & Sources

LG Dishwashers Not Draining: Causes, Fixes, and What to Check First Repair-Blog

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

70%

DIY Success Rate Difficulty: Either

Common Issues Reported by Users

Faulty float switch preventing proper water level detection
Clogged drain hose restricting water flow
Defective water inlet valve causing excessive water intake

User Suggested Solutions

Inspect and clean the float switch: Open the dishwasher door, locate the float switch (usually at the bottom), remove any debris, and ensure it moves freely. Test the float switch with a multimeter for continuity.
Clear the drain hose: Disconnect the drain hose from the dishwasher and sink, check for blockages, and clean it thoroughly. Reconnect and test the dishwasher.
Replace the water inlet valve: Turn off the water supply, disconnect the inlet valve, and replace it with a new one. Reconnect everything and test for proper operation.