Warning: Disconnect power before servicing.
ErrBase

Lg Dishwasher Won't Start: Causes and Fixes

Quick Answer

LG dishwasher won't start: check that the door is fully latched (the door switch must click). Then check for Control Lock (hold the Lock button 3-5 seconds). Also verify the water supply is on - some models won't start without water.

Lg dishwasher won't start has brand-specific causes related to Lg's proprietary technology and component design.

LgDishwasherSeverity: mediumDifficulty: intermediate75% DIY Success
Time to Fix
15–90 min
Difficulty
intermediate
Parts Cost
—
Tools Needed
Multimeter, Screwdriver set

What Does the WONT-START Code Mean?

Lg dishwasher won't start - see the detailed diagnosis steps below for Lg-specific causes and fixes.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Door latch incomplete30%
Control/Delay Lock20%
Water supply off15%
Touchpad failed15%
Thermal fuse blown10%
Float switch stuck up10%

Symptoms You May Notice

  • Won't Start on Lg dishwasher
  • Performance degradation
  • Unusual sounds or behavior
  • Error code may appear

Can you reset a Lg dishwasher to clear the WONT-START code?

Unplug for 60 seconds. Some Lg models have specific reset sequences - check the diagnostic mode entry above.

Tools Required for Diagnosis

MultimeterScrewdriver setFlashlight

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Check the most common Lg-specific cause for won't start on Lg

Check the most common Lg-specific cause for won't start on Lg dishwashers. See the detailed guide above.

2

Check secondary causes common across all dishwasher brands but

3

If basic checks do not reveal the cause, run the brand

Frequently Asked Questions

How much does it cost to fix a Lg dishwasher won't start?
Most Lg dishwasher won't start repairs cost $100-400 depending on the cause. Simple fixes (cleaning, resetting) are free. Part replacements range from $10-200 plus $100-200 labor.
Is it worth repairing a Lg dishwasher won't start?
If the dishwasher is under 8 years old and the repair is under 50% of replacement cost, repair is worthwhile. Lg extended the Linear Compressor warranty to 10 years on refrigerators.
Can I fix Lg dishwasher won't start myself?
Many Lg dishwasher issues are DIY-fixable with basic tools. Water-related repairs may require turning off the water supply.

Same Fix Works on These Brands

Lg shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

Lg washerLG Washer Error Codes: Complete List With Fixes (2026)Lg washerLG Washer LE Error: Why the Motor Locked Up (Fix It Fast)Lg washerSUD on Your LG Washer? Too Many Suds (Here's the Real Fix)Lg washerLG Washer OE Code: Water Won't Drain (Troubleshooting Guide)Lg washerHow to Reset an LG Washer (Every Method, Every Model)Lg washerFE Code on LG Washer: Overfilling and How to Stop It

Models Known to Experience WONT-START Errors

This repair applies to most Lg dishwashers with this error code. Common model numbers include:

LDFN4542S, LDP6810SS, LDT7808SS

Last verified for technical accuracy on March 15, 2026