Lg Oven: flames coming out of convection fan opening

Professional Repair Guide

What is this symptom?

If you notice flames, often blue, coming from the convection fan opening of your LG oven, it indicates a serious safety issue. This abnormal occurrence can be due to grease buildup, incorrect gas conversion, or gas pressure problems. Immediate action is crucial as it poses a fire risk. Do not use the oven until the cause is identified and resolved.

Urgency: Critical

Important Tips for Lg Models

  • LG owner manuals specify correct operating gas pressure requirements (e.g., 5" water column for Natural Gas and 10" for LP) and emphasize proper conversion using the provided installation kit; incorrect conversion or pressure can produce abnormal flames.
  • LG official troubleshooting for gas flame issues recommends cleaning burner holes/ports with a needle to remove debris as a known cause of combustion problems.

Possible Causes

Grease/food residue ignition near the convection fan cover or rear oven cavity due to heavy buildup (especially after roasting, spills, or inadequate cleaning)

How to Identify: Flames are accompanied by smoke and burning odor; residue visible on rear panel or around fan cover; flare-ups may happen after high-temperature cooking or self-clean; problem may reduce after thorough cleaning.

Part: Oven cavity rear panel / convection fan cover / interior surfaces

Incorrect gas conversion setup (LP vs Natural Gas) or wrong burner orifice sizing causing flames to be excessively large and extend into areas of the oven cavity (potentially toward the convection fan opening)

How to Identify: Flames appear larger than normal, may be yellow/orange, may smell of gas/propane; issue often begins immediately after installation, relocation, gas type change, or conversion; other burners may also show abnormal flame height.

Part: Bake burner orifice(s) / conversion kit / pressure regulator configuration

Gas pressure regulator problem or supply pressure too high, driving overly large flames that can extend beyond the intended burner area

How to Identify: All gas flames (cooktop and/or oven are higher than normal; flames may be noisy or lifting; issue persists regardless of cleaning; may worsen suddenly without any cooking spill.

Part: Pressure regulator / gas supply line pressure

Clogged/partially obstructed burner ports or air shutter issues leading to unstable combustion (possible flame lift/flashback) and flame rollout inside the oven cavity

How to Identify: Flame pattern is uneven, noisy, lifting, or sputtering; delayed ignition (whoosh may occur; cleaning burner ports may temporarily improve; may coincide with weak/erratic flame symptoms.

Part: Bake burner assembly / burner ports / air shutter (if accessible) / burner head

Faulty gas valve or burner assembly defect causing abnormal gas flow inside the oven cavity (including flames visible from unintended openings)

How to Identify: Persistent abnormal flames even after cleaning and verification of correct gas type/orifice; possible gas odor; may cause overheating and safety shutdown; may be accompanied by ignition anomalies.

Part: Oven safety gas valve / bake burner assembly

DIY Solutions

Immediate safety shutdown and inspection for grease/food ignition sources (highest priority)

Easy 10-20 minutes (inspection) + 30-60 minutes (cleaning)
Tools Needed: Flashlight, Non-abrasive sponge or cloth, Degreasing cleaner safe for ovens, Warm soapy water, Gloves
  1. Turn the oven OFF immediately. If flames are present, keep the door closed to limit oxygen unless flames are coming out of the front; if unsafe, evacuate and call emergency services.
  2. Turn off the gas supply shutoff valve to the range (usually behind the unit) once safe to do so.
  3. Allow the oven to cool completely.
  4. Inspect the oven interior, especially the rear panel and convection fan cover area, for grease splatter, pooled residue, or burned debris.
  5. Clean all visible grease and residue from the rear panel, fan cover, bottom of the cavity, and racks using an appropriate degreaser and non-abrasive tools.
  6. Do NOT run self-clean immediately after a flare-up; wait until the oven is fully cleaned and inspected.
  7. Test the oven on a low bake setting only after cleaning and only if there is no gas odor; if flames reappear at the fan opening, stop and proceed to professional service.
⚠️ Safety First: This symptom is a fire risk; do not continue cooking while flames are visible.

Check for installation/conversion errors (LP vs Natural Gas) using the owner’s manual and labeling

Moderate 20-40 minutes
Tools Needed: Owner’s manual, Flashlight, Wrench (for accessing rear area if needed)
  1. Identify whether your home supply is Natural Gas or LP/Propane.
  2. Locate the range’s gas type labeling and confirm it matches your supply type (many ranges are shipped set for Natural Gas unless converted).
  3. Review the owner’s manual conversion section for your exact LG model and confirm conversion steps were completed correctly (correct orifices installed and regulator adjusted).
  4. If you recently moved or installed the range and are unsure conversion was done correctly, stop and schedule a qualified technician to verify orifice sizing and regulator settings.
⚠️ Safety First: Do not attempt to change orifices or regulator settings unless you are trained; incorrect setup can cause fire or carbon monoxide risk.

Clean accessible burner ports/holes if flame pattern is erratic (only if safe and accessible per LG guidance)

Moderate 20-30 minutes
Tools Needed: Sewing needle or thin pin, Soft brush, Vacuum (optional)
  1. Turn off power and gas to the range and allow the unit to cool completely.
  2. Follow LG’s guidance for cleaning burner holes/ports (for gas flame quality issues) using a needle/pin to remove debris.
  3. Remove loose debris with a soft brush and optionally vacuum surrounding dust (do not vacuum hot surfaces).
  4. Reassemble and test. If flames still appear near the fan opening, stop and schedule service.
⚠️ Safety First: Only clean what is safely accessible; do not disassemble sealed gas components.

Professional Repairs

Verify and correct gas type conversion (LP/Natural Gas), replace incorrect orifices, and set regulator correctly

Estimated Cost: $150 - $400

Diagnose and replace faulty pressure regulator or correct supply pressure

Estimated Cost: $200 - $500

Inspect bake burner assembly for damage/warping and replace if flame rollout persists

Estimated Cost: $250 - $600

Diagnose and replace oven safety gas valve if gas flow is abnormal

Estimated Cost: $300 - $700

When to Call a Professional

Any time flames are visible coming from the convection fan opening (treat as a critical fire risk).
If you smell gas/propane during or after operation, or if flames are yellow/orange and sooty (possible incomplete combustion).
If the issue started immediately after installation, moving the range, or switching gas types (possible wrong orifice/regulator setup).
If flames remain after a thorough cleaning of grease and residue from the oven cavity and rear fan cover area.
If multiple burners (cooktop and oven) have abnormally high flames, suggesting supply pressure or regulator problems.

Preventive Maintenance

  • Clean oven cavity spills and grease splatter promptly, especially on the rear panel and around the convection fan cover area.: Grease ignition and flare-ups that can appear as flames near the convection fan opening.
    Frequency: After spillovers / monthly for heavy use
  • Use a drip pan or roasting pan for high-fat foods and avoid overfilling pans that can spill grease.: Grease buildup and ignition inside the oven.
    Frequency: Every use when roasting
  • Have a qualified technician verify gas pressure and correct orifice/regulator configuration after installation or any move/gas-type change.: Oversized flames, flame rollout, and unsafe combustion.
    Frequency: After installation/move or gas-type changes

Frequently Asked Questions

Why is my LG Oven flames coming out of convection fan opening?
Common causes include grease ignition, incorrect gas conversion, or gas pressure issues.
How do I fix LG Oven flames coming out of convection fan opening myself?
Turn off the oven, check for grease buildup, and confirm gas type conversion.
How much does it cost to fix flames coming out of convection fan opening?
Professional repairs can range from $150 to $700 depending on the issue.
When should I call a technician for flames coming out of convection fan opening?
Call a technician immediately if flames are visible, as it indicates a critical safety risk.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

65%
DIY Success Rate Difficulty: Professional

Common Issues Reported by Users

  • Blocked or dirty convection fan causing overheating and flames
  • Faulty ignition system leading to excessive gas release
  • Improper installation or damaged venting system allowing flames to escape

User Suggested Solutions

  1. Turn off the oven immediately and disconnect it from the power source. Inspect the convection fan for any blockages or debris. Clean the fan and surrounding area thoroughly. Reassemble and test the oven.

  2. Check the ignition system for any faulty components. If necessary, replace the igniter or gas valve. Ensure all connections are secure and test for gas leaks before using the oven again.

  3. Inspect the venting system for damage or improper installation. Ensure all ducts are properly connected and not obstructed. If damage is found, replace the venting components as needed.

Analysis based on 1 community discussions
View Sources

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

  1. LG LSGL6335 - Flames coming out of convection fan opening in...

Community Discussions

flames coming out of convection fan opening

Exchanged the faulty oven for a new one.

Pro needed View on Reddit →

Source: Reddit r/appliancerepair

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