Lg Microwave: not functioning

Professional Repair Guide

What is this symptom?

Is your LG microwave not functioning at all? If there's no display, lights, fan, or heating, it could indicate power supply issues, a blown fuse, or even a faulty door switch. This guide will help you diagnose and resolve the problem effectively.

Urgency: Medium

Important Tips for Lg Models

  • LG official troubleshooting specifically highlights power connection, outlet, and circuit breaker issues as common for no power.

Possible Causes

Power supply issues

How to Identify: Microwave has no lights or sound; other devices on same outlet also fail when plugged in; circuit breaker is tripped.

Part: Outlet/circuit breaker/power cord

Blown internal fuse or thermal fuse

How to Identify: Microwave receives no power despite outlet working; continuity test of fuse with multimeter shows no continuity.

Part: Line fuse/thermal fuse

Faulty door switch/interlock

How to Identify: Microwave appears dead or won’t start even with power present; door doesn’t latch properly; tests show interlocks not engaging.

Part: Door interlock switches and switch holder

Control panel or main control board failure

How to Identify: Display stays off or unresponsive despite good power and door closure; sometimes after power surge.

Part: Control board/touchpad

Internal component overheating protection trip

How to Identify: Microwave shuts off mid-cycle or won’t restart until cool; internal thermostat trips due to heat.

Part: Thermostat/thermal cutout

DIY Solutions

Check and restore power to microwave

Easy 5-10 minutes
Tools Needed: none
  1. Ensure microwave is firmly plugged into wall outlet.
  2. Test outlet by plugging in another device to confirm power.
  3. Check and reset circuit breaker for microwave’s circuit if necessary.
⚠️ Safety First: Do not use extension cords or surge protectors with microwave as per LG guidance.

Inspect and replace blown external fuse or internal thermal fuse

Advanced 30-60 minutes
Tools Needed: screwdriver set, multimeter, replacement fuse
  1. Unplug microwave and allow to discharge (capacitor can retain charge).
  2. Remove outer cover of microwave to access internal fuse.
  3. Test internal line/thermal fuse with a multimeter for continuity and replace if blown.
⚠️ Safety First: High voltage inside microwave can be lethal; proceed only if experienced.

Professional Repairs

Replace door interlock switches or switch holder assembly

Estimated Cost: $50 - $150

Diagnose/replace control board or power supply board

Estimated Cost: $100 - $300

Replace internal thermal/line fuse

Estimated Cost: $30 - $100

When to Call a Professional

If the microwave still won’t power on after checking and resetting external power.
When internal components like fuses or switches need replacement and you lack experience.
If there are signs of electrical damage, burning smell, or control board failure.

Preventive Maintenance

  • Ensure proper ventilation and avoid prolonged high-power use: Overheating and thermal fuse trips
    Frequency: ongoing
  • Regularly check door latch and keep clean: Door interlock issues
    Frequency: monthly

Frequently Asked Questions

Why is my LG Microwave not functioning?
Common causes include power supply issues, blown fuses, or a faulty door switch.
How do I fix LG Microwave not functioning myself?
Check power connections, inspect fuses, and replace if necessary.
How much does it cost to fix not functioning?
Professional repairs range from $30 to $300 depending on the issue.
When should I call a technician for not functioning?
If DIY solutions don't work or if the problem seems complex, consult a technician.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Common Issues Reported by Users

  • Control board failure (1 mentions)

User Suggested Solutions

  1. Replace control board

    Success rate: 0.0%
Analysis based on 2 community discussions
View Sources

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

  1. Please help me decide on an induction range and a microwave
  2. Microwave oven LG LMHM2017SW not working

Community Discussions

ours is dead

Recommendations for induction ranges and microwaves were provided, including LG and Cafe models.

Pro needed View on Reddit →

Source: Reddit r/appliancerepair

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