Lg Microwave: intermittently stops

Professional Repair Guide

What is this symptom?

If your LG microwave intermittently stops during cooking, it can be frustrating. This issue may occur shortly after starting or mid-cycle, requiring a restart. Common causes include faulty door switches, thermal cut-outs activating due to overheating, control board malfunctions, or power supply issues. Understanding these symptoms can help you identify the problem and explore potential solutions.

Urgency: Medium

Important Tips for Lg Models

  • LG microwaves commonly list door switches, micro switches, and control boards as failure points that cause shutdowns. (修理诊所
  • Energy saving feature may turn off display after inactivity but this is not the same as a mid‑cycle stop.

Possible Causes

Faulty door switch / interlock assembly (universal and LG specific)

How to Identify: Microwave stops when door is nudged or vibration occurs, or repeatedly stops without error code; door not fully latching

Part: Door switch / interlock

Overheat safety/ thermal cut‑out activation (universal)

How to Identify: Stops after longer run times or when ventilation is blocked; unit resumes after cooling

Part: Thermal fuse / thermal cut‑out

Control board / electronics malfunction (LG specific)

How to Identify: Erratic stopping without door action or overheat; buttons non‑responsive or incorrect cycle behavior

Part: Control board / main PCB

Power supply instability / outlet or cord issue (universal)

How to Identify: Stops mid‑cycle with no other symptoms; related electrical disturbance in outlet or shared circuit

Part: Power cord, outlet, breaker

DIY Solutions

Check Microwave Placement and Ventilation

Easy 5 minutes
  1. Ensure the microwave vents are not blocked by walls, cabinets, or objects.
  2. Allow 10–15 cm clearance around vents for airflow.
  3. Test by running for a short cycle and see if stops persist.
⚠️ Safety First: Do not cover ventilation openings

Inspect Door Latch and Clean Switch Area

Moderate 10–20 minutes
Tools Needed: soft cloth, isopropyl alcohol
  1. Unplug the microwave.
  2. Open the door and clean around the latch and switches to remove debris.
  3. Close the door firmly ensuring it latches completely.
⚠️ Safety First: Unplug before touching door components

Professional Repairs

Replace Door Switch / Interlock Assembly

Estimated Cost: $30 - $100

Control Board Diagnostics and Replacement

Estimated Cost: $120 - $250

Thermal Cut‑Out or Thermal Fuse Replacement

Estimated Cost: $40 - $150

When to Call a Professional

Repeated mid‑cycle stops after DIY checks
Visible electrical odors, smoke, or sparks
Microwave does not restart or display errors

Preventive Maintenance

  • Clean door seals and vents: Overheat and door latch related stops
    Frequency: monthly
  • Avoid blocking vents and allow cooldown between long uses: Thermal protection trips
    Frequency: as needed

Frequently Asked Questions

Why is my LG Microwave intermittently stops?
Common causes include faulty door switches, thermal cut-outs, control board malfunctions, or power supply issues.
How do I fix LG Microwave intermittently stops myself?
Check microwave placement for proper ventilation and clean around the door latch and switches.
How much does it cost to fix intermittently stops?
Professional repairs can range from $30 for door switches to $250 for control board replacement.
When should I call a technician for intermittently stops?
If DIY solutions don’t resolve the issue or if the problem persists, it's time to call a technician.

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 door interlock switch
  • Worn or damaged wiring
  • Malfunctioning capacitor

User Suggested Solutions

  1. Inspect and replace the door interlock switch: Unplug the microwave, remove the outer casing, locate the door interlock switch, test it for continuity using a multimeter, and replace it if faulty.

  2. Check and repair wiring: Unplug the microwave, inspect the wiring for any signs of wear or damage, and repair or replace any damaged wires.

  3. Test and replace the capacitor: Unplug the microwave, discharge the capacitor safely, test it with a multimeter, and replace it if it is faulty.

Analysis based on 1 community discussions
View Sources

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

  1. LG Microwave Cuts Out Intermittently

Community Discussions

stops occasionally like the door had been opened

Check the top interlock switch and connector; could also be a bad capacitor or wire.

Pro needed View on Reddit →

Source: Reddit r/appliancerepair

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