Lg Oven: power cycling

Professional Repair Guide

What is this symptom?

Is your LG oven power cycling during use? This common issue can disrupt cooking by causing the oven to turn off and on unexpectedly, fail to maintain temperature, or shut down mid-cycle. Understanding the root causes is essential for effective troubleshooting.

Urgency: Medium

Important Tips for Lg Models

  • LG induction cooktops explicitly cycle power on burners to regulate temperature, but this is normal heating control behavior. Cycling due to safety sensor faults or control issues is distinct.

Possible Causes

Faulty temperature sensor / thermistor

How to Identify: Oven cycles around temperature changes; sensor may show abnormal resistance when tested with a multimeter; error codes related to sensor faults may appear.

Part: Oven temperature sensor (thermistor)

Overheating protection / internal safety thermostat activation

How to Identify: Oven cycles off when internal temp reaches high threshold; may feel excessive heat around vents or see overheating error codes.

Part: Safety thermostat / thermal cutoff

Power supply fluctuation / circuit issue

How to Identify: Oven cycling matches electrical load changes or breaker trips; other appliances on same circuit may also be affected.

Part: Power supply / circuit breaker

DIY Solutions

Check and test temperature sensor

Moderate 30–60 minutes
Tools Needed: multimeter, screwdriver
  1. Disconnect oven from power.
  2. Locate the internal temperature sensor (usually inside oven cavity rear).
  3. Disconnect sensor and test resistance with multimeter; compare to expected ~1100Ω at room temp.
  4. Replace sensor if readings are outside tolerance and reassemble.
⚠️ Safety First: Ensure power is off before opening oven.

Reset oven control board

Easy 10–15 minutes
  1. Turn off the oven’s circuit breaker for a few minutes.
  2. Restore power and test operation.
⚠️ Safety First: Ensure breaker controls only the oven circuit before switching off.

Professional Repairs

Control board or relay replacement

Estimated Cost: $200 - $500+

Safety thermostat / thermal fuse replacement

Estimated Cost: $100 - $300

When to Call a Professional

Oven continues to power cycle after temperature sensor replacement.
Control panel displays multiple error codes not resolved by reset.
Signs of electrical burning, smell, or visible damage inside oven.

Preventive Maintenance

  • Clean oven interior and vents: Overheating that could trip safety cutoffs
    Frequency: monthly
  • Inspect and test temperature sensor: Erratic cycling due to sensor drift
    Frequency: annually

Frequently Asked Questions

Why is my LG Oven power cycling?
Common causes include a faulty temperature sensor, overheating protection activation, or power supply issues.
How do I fix LG Oven power cycling myself?
You can test the temperature sensor or reset the oven's control board for a quick fix.
How much does it cost to fix power cycling?
Professional repairs can range from $100 to $500, depending on the issue.
When should I call a technician for power cycling?
If DIY solutions fail or if you're unsure about the repairs, it's best to call a technician.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

60%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • Faulty temperature sensor causing incorrect readings and triggering safety shutdowns.
  • Defective or improperly installed PCB (Printed Circuit Board) leading to erratic behavior.
  • Loose or damaged wiring connections which can cause intermittent power loss.

User Suggested Solutions

  1. Check and replace the temperature sensor. Disconnect the oven from power, locate the sensor, and test it with a multimeter. If it's out of range, replace it.

  2. Inspect and secure all wiring connections. Open the oven's back panel, check for loose wires, and reattach or replace any damaged connections.

  3. Replace the PCB if faulty. Disconnect power, remove the old PCB, and install the new one, ensuring all connections are secure.

Analysis based on 1 community discussions
View Sources

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

  1. LG Oven Keeps Restarting When at Temperature

Community Discussions

keeps restarting when at temperature

Replaced PCB motherboard, fixed the issue.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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