Warning: Disconnect power before servicing.
ErrBase

Lg Oven Won't Turn On: Causes and Fixes

Quick Answer

LG oven won't turn on: check for LOC (Lock) on the display. LG ovens have a Control Lock separate from the Child Lock. Also: LG ranges with SmartThinQ/ThinQ connectivity may show a lock icon when the oven is being controlled remotely through the app.

LG oven won't turn on: check for LOC (Lock) on the display. LG ovens have a Control Lock separate from the Child Lock. Also: LG ranges with SmartThinQ/ThinQ connectivity may show a lock icon when the oven is being controlled remotely through the app. Check the ThinQ app to see if a remote lock is active. LG gas ovens: verify the gas valve behind the range is open.

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

What Does the WONT-START Code Mean?

Lg oven won't turn on: see brand-specific guide above.

Most Likely Causes

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

Door lock or lid switch not confirming secure closure40%
Tripped circuit breaker or blown thermal fuse24%
Control board failure from power surge14%
Child lock mode enabled accidentally12%
Stuck start button or control panel fault10%

Symptoms You May Notice

  • Lg Oven Won't Turn On symptom

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

Unplug 60 seconds.

Tools Required for Diagnosis

MultimeterScrewdriverFlashlight

Diagnostic Checklist

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

1

Follow brand-specific diagnosis above.

Follow brand-specific diagnosis above.

2

Check error codes and secondary causes.

3

Professional diagnosis if basic checks fail.

Frequently Asked Questions

Lg oven repair cost?
$100-400 typical.
Repair or replace?
Under 18 years and under 50% replacement = repair.
DIY?
Many fixes DIY. Gas/sealed systems need pros.

Same Fix Works on These Brands

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

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Last verified for technical accuracy on March 15, 2026