Lg Microwave Combi Oven: not heating

Professional Repair Guide

What is this symptom?

If your LG Microwave Combi Oven powers on but does not heat food, you're likely facing a common issue. This symptom can occur when the microwave turns but lacks any warming effect during operation, leaving your meals cold. Understanding the potential causes, like magnetron failure, is essential for troubleshooting and repair.

Urgency: Medium

Important Tips for Lg Models

  • Official support notes general causes of microwave not heating and refers users to correct settings and service options.

Possible Causes

Magnetron failure

How to Identify: Microwave runs and may sound normal but food remains cold; no heat generated even though unit turns on.

Part: Magnetron

DIY Solutions

Check settings and container

Easy 5–10 minutes
  1. Ensure cooking mode is set to appropriate heating power.
  2. Use microwave-safe containers (no metal or reflective trim).
  3. Test with a 200 ml cup of water and 1–2 minutes heating to check performance.
⚠️ Safety First: Do not use metal containers; can cause sparks and damage.

Power reset

Easy 10 minutes
  1. Unplug the microwave from the power outlet.
  2. Wait 10 minutes to allow internal systems to reset.
  3. Plug back in and test heating with water.
⚠️ Safety First: Ensure the microwave is unplugged before touching plug or outlet.

Professional Repairs

Replace magnetron

Estimated Cost: $80 - $200 for part, plus labor

Replace high-voltage diode or thermal fuse

Estimated Cost: $20 - $80 parts, plus labor

Replace door switches

Estimated Cost: $15 - $50 parts, plus labor

When to Call a Professional

Water test shows little or no heating after basic checks
Signs of electrical component failure such as sparks, burning smell, or noise
Door switch or high-voltage component malfunction suspected

Preventive Maintenance

  • Use microwave-safe containers: Avoids heating inefficiency and interior damage
    Frequency: every use
  • Clean interior regularly: Improved microwave efficiency and avoids uneven heating due to soiling
    Frequency: monthly

Frequently Asked Questions

Why is my LG Microwave Combi Oven not heating?
Common causes include magnetron failure, faulty high-voltage diode, or malfunctioning door switches.
How do I fix LG Microwave Combi Oven not heating myself?
Check settings, use microwave-safe containers, and perform a power reset to troubleshoot the issue.
How much does it cost to fix not heating?
Replacing the magnetron can cost $80 - $200, while other parts range from $15 to $80, plus labor.
When should I call a technician for not heating?
If simple DIY solutions don't resolve the issue, or if you're uncomfortable with repairs, consider professional help.

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: Either

Common Issues Reported by Users

  • Faulty magnetron
  • Defective high voltage capacitor
  • Broken door switch or latch

User Suggested Solutions

  1. Test and replace the magnetron if necessary. Disconnect the microwave from power, remove the outer casing, locate the magnetron, and test it with a multimeter for continuity. If defective, replace it with a new one.

  2. Inspect and replace the high voltage capacitor. Ensure the microwave is unplugged, discharge the capacitor safely, and test it for functionality. Replace if faulty.

  3. Check the door switch and latch. Open the microwave door and press the switch manually to see if it engages. If not, replace the switch or repair the latch mechanism.

Analysis based on 1 community discussions
View Sources

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

  1. LG never again

Community Discussions

Microwave stopped working, seemed like the magnetron.

DIY replaced the magnetron.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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