Lg Oven: glass cooktop cracked

Professional Repair Guide

What is this symptom?

If your LG oven's glass-ceramic cooktop has developed a crack, it could be due to impact damage, thermal shock, or stress from heavy cookware. Using a cracked cooktop can be dangerous, potentially leading to further damage and safety hazards. Immediate action is crucial to prevent accidents and costly repairs.

Urgency: High

Important Tips for Lg Models

  • LG ranges use a model-specific glass-ceramic cooktop assembly; replacement requires matching the exact model number to the correct OEM part. Multiple repair guides emphasize replacing the entire cooktop glass assembly rather than attempting a crack repair.

Possible Causes

Impact damage from dropped cookware, lids, or heavy objects

How to Identify: Crack appears immediately after a drop/strike; often radiates outward from a single point of impact or forms a spiderweb pattern.

Part: Glass-ceramic cooktop assembly (surface glass)

Thermal shock (cold liquid/ice/cold pan placed on a hot cooktop)

How to Identify: Crack appears shortly after a rapid temperature change (e.g., cold spill on a hot burner; may be a long linear crack without a clear impact point.

Part: Glass-ceramic cooktop assembly (surface glass)

Excessive localized stress from oversized, warped, or very heavy cookware (uneven contact/pressure)

How to Identify: Cracks appear after repeated use with large/heavy cookware, can start near burner edges; cookware may rock due to a warped bottom.

Part: Glass-ceramic cooktop assembly (surface glass)

Pre-existing chip/scratch that propagates into a crack with heat cycling

How to Identify: Small chip/scratch was present previously; crack grows from that point over multiple cooking cycles.

Part: Glass-ceramic cooktop assembly (surface glass)

Manufacturing defect or installation stress (improper mounting or frame stress)

How to Identify: Crack appears early in ownership without impact/thermal shock; may coincide with cabinet pressure or range frame misalignment.

Part: Glass-ceramic cooktop assembly and mounting frame/brackets

DIY Solutions

Immediate safety shutdown and containment (temporary measure until replacement)

Easy 5-10 minutes
Tools Needed: Work gloves, Flashlight, Masking tape or clear packing tape (for containment only)
  1. Turn OFF all burners and let the cooktop fully cool.
  2. If electric: switch OFF the range breaker (recommended). If the range is plugged in, unplug it after cooling.
  3. Wear gloves and carefully remove any loose glass fragments (do not press on the cracked area).
  4. Apply tape over the crack only to reduce the risk of cuts from loose fragments (this is NOT a structural repair).
  5. Avoid using any cooktop elements until the glass top is replaced.
⚠️ Safety First: Do not cook on a cracked glass cooktop—heat can expand the crack and shatter the surface.

Replace the glass cooktop assembly (OEM replacement)

Advanced 60-120 minutes
Tools Needed: Screwdrivers (Phillips/flat), Nut driver or socket set, Work gloves, Helper (recommended for lifting), Camera/phone (to document wire routing)
  1. Locate the model number (typically inside the oven door frame or storage drawer area) to order the correct OEM glass cooktop assembly.
  2. Turn off power at the breaker (electric ranges) or unplug the unit; allow the cooktop to fully cool.
  3. Access mounting screws/brackets for the cooktop (often from the back panel or under the front lip, depending on model).
  4. Carefully lift and support the cooktop surface; document and disconnect any harnesses or indicator light wiring attached to the glass assembly.
  5. Transfer components (such as brackets, insulation pieces, or trim) from the old assembly to the new one if required.
  6. Install the new cooktop assembly, reconnect wiring exactly as documented, secure all screws, and reassemble panels.
  7. Restore power and test each element briefly for proper heating and indicator operation.
⚠️ Safety First: Risk of injury from sharp glass—use gloves and dispose of broken glass safely.

Professional Repairs

Replace glass-ceramic cooktop assembly (technician service)

Estimated Cost: $350 - $900

Inspect and replace damaged wiring/element insulation caused by shattering or heat exposure

Estimated Cost: $200 - $600 (in addition to glass if required)

When to Call a Professional

The crack is large, spiderwebbed, or the cooktop has shattered (loose glass fragments).
You see or suspect liquid seeped under the glass (spill occurred around the time of cracking).
Any signs of electrical damage: burning smell, sparking, tripped breaker, error behavior after cracking.
You are not comfortable disconnecting/reconnecting wiring harnesses or lifting the cooktop safely.
The range is under warranty—replacement may be covered depending on cause and coverage terms.

Preventive Maintenance

  • Avoid dropping cookware/lids; lift cookware rather than sliding it across the surface.: Impact cracks and chips that later propagate into cracks
    Frequency: Always
  • Prevent thermal shock: do not pour cold water on a hot cooktop; do not place frozen/cold items directly on hot glass.: Thermal stress cracking
    Frequency: Always
  • Use flat-bottom cookware and avoid extremely heavy cookware unless the manufacturer allows it; avoid warped pans that rock.: Stress cracking from uneven pressure/heat concentration
    Frequency: Always
  • Clean spills promptly after cooling; avoid abrasive cleaners that can scratch and weaken the surface over time.: Surface damage that can contribute to crack propagation
    Frequency: Weekly (or after spills)

Frequently Asked Questions

Why is my LG Oven (range with glass-ceramic cooktop) glass cooktop cracked?
Common causes include impact damage, thermal shock from cold liquids, and stress from heavy cookware.
How do I fix LG Oven (range with glass-ceramic cooktop) glass cooktop cracked myself?
Turn off the power, let it cool, and remove loose glass. For a full repair, replace the glass cooktop assembly.
How much does it cost to fix glass cooktop cracked?
Professional repairs for a glass cooktop replacement typically range from $350 to $900.
When should I call a technician for glass cooktop cracked?
Call a technician immediately if the crack expands or if you notice any safety hazards.

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

  • Impact from heavy cookware or dropped items
  • Thermal shock due to rapid temperature changes
  • Manufacturing defects in the glass cooktop

User Suggested Solutions

  1. Replace the cracked glass cooktop. Ensure the oven is unplugged. Remove the screws or clips holding the cooktop in place. Lift off the old cooktop and replace it with the new one, securing it with screws or clips.

  2. Contact LG customer service for warranty service if the cooktop is still under warranty due to a manufacturing defect.

  3. Use a repair adhesive for minor cracks (not recommended for large cracks). Clean the area, apply the adhesive, and let it cure according to instructions.

Analysis based on 1 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. 2015 LG range with glass cooktop, glass just cracked

Community Discussions

glass cooktop cracked

Replace the glass cooktop with a cheaper part found online, as it is not too difficult to replace.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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