LG Oven: power cycling
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.
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
- Disconnect oven from power.
- Locate the internal temperature sensor (usually inside oven cavity rear).
- Disconnect sensor and test resistance with multimeter; compare to expected ~1100Ω at room temp.
- Replace sensor if readings are outside tolerance and reassemble.
Reset oven control board
- Turn off the oven’s circuit breaker for a few minutes.
- Restore power and test operation.
Next step
Choose the next step for power cycling
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Temperature Sensor
Monitors the internal temperature to ensure correct operation and prevent overheating.
- Typical part-only price
- $15 - $35
- DIY difficulty
- Easy
- Estimated time
- 15-30 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Thermostat
Regulates temperature by turning the heating or cooling system on or off.
Power Control Board
Distributes and switches electrical power for the appliance's major loads.
Model-compatible Oven parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Non-Scratch Cooktop Cleaner
A routine surface-care product. Confirm that it is approved for the specific glass, ceramic, enamel, or stainless finish.
Oven Thermometer
A diagnostic aid for comparing cavity temperature during a controlled check. It does not prove which internal component has failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Professional Repairs
Control board or relay replacement
Safety thermostat / thermal fuse replacement
When to Call a Professional
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?
How do I fix LG Oven power cycling myself?
How much does it cost to fix power cycling?
When should I call a technician for power cycling?
References & Sources
Community Analytical Insights
Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions
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
-
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.
-
Inspect and secure all wiring connections. Open the oven's back panel, check for loose wires, and reattach or replace any damaged connections.
-
Replace the PCB if faulty. Disconnect power, remove the old PCB, and install the new one, ensuring all connections are secure.
Limited-source guidance; percentages and success-rate claims are not shown
View
Sources
Data compiled from real discussions on r/appliancerepair and r/Appliances:
Community Discussions
keeps restarting when at temperature
Replaced PCB motherboard, fixed the issue.
Source: Reddit r/appliancerepair
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