LG Dishwasher: overfilling, slow draining
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.
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 doesn’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
- 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.
Check and free float switch
- Turn off dishwasher power.
- Locate float assembly at base of dishwasher.
- Manually move float to ensure it moves freely and isn’t stuck.
- If stuck, clean area around float to allow free motion.
- Optional: test float switch continuity with multimeter.
- Restore power and test cycle.
Inspect and straighten drain hose
- 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.
Next step
Choose the next step for overfilling, slow 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.
Most relevant component to inspect
Float Switch
Detects the maximum water level to prevent overflow and potential flooding.
- Typical part-only price
- $15 - $40
- DIY difficulty
- Easy
- Estimated time
- 10-20 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.
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.
Water Inlet Valve
Controls the flow of hot and cold water into the appliance.
Main Control Board
The central brain of the appliance that controls all components, cycles, and timings.
Drain Hose
Carries waste water from the drain pump to your home's standpipe or sink drain.
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.
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.
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.
Braided Dishwasher Inlet Hose
For replacement of an externally damaged supply hose. Verify connection size, length, and appliance installation requirements before ordering.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Professional Repairs
Replace float switch
Replace water inlet valve or control board
When to Call a Professional
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?
How do I fix LG Dishwasher overfilling, slow draining myself?
How much does it cost to fix overfilling, slow draining?
When should I call a technician for overfilling, slow draining?
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
- 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.
Limited-source guidance; percentages and success-rate claims are not shown
View
Sources
Data compiled from real discussions on r/appliancerepair and r/Appliances:
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