LG Microwave: not turning off; overheating
What is this symptom?
Is your LG microwave not turning off and overheating? This issue can lead to excessive heat and potential damage. Common causes include a faulty cooling fan, thermal protection activation, or door switch malfunctions. Identifying the root cause quickly is crucial to avoid further complications.
Important Tips for LG Models
- Specific causes for 'not turning off' in LG models are not documented in official LG support publicly; general LG repair guides reference common issues affecting operation like door switches and control board, but not continuous run specific.
Possible Causes
Faulty cooling fan or ventilation problem
How to Identify: Microwave feels very hot, fan running weakly or not at all, overheats before expected cook time; intermittent shutdown then restart after cooling. Common in community reports of overheating behavior. turn1(Chula Vista Appliance Service Center
Part: Cooling fan / ventilation system
Thermal protection / overheat sensor activation
How to Identify: Microwave stops mid‑cycle then may restart after cooling; heat protection trips due to internal overheat. (Chula Vista Appliance Service Center
Part: Thermal cutoff / thermostat
Door switch or latch malfunction causing improper control signaling
How to Identify: Microwave may run or not shut off when door opened or poorly latched; operational controls behave inconsistently. Community troubleshooting guides note door switch issues cause unpredictable behavior.
Part: Door switch assembly
Control board or timer circuit fault
How to Identify: Microwave does not shut off when timer completes; display or buttons may act erratically.
Part: Electronic control board/timer
DIY Solutions
Check ventilation clearance and ensure cooling fan operation
- Unplug the microwave from power.
- Ensure the unit’s vents are not blocked and that manufacturer‑recommended clearance is present.
- Access rear cover to visually check if the cooling fan spins freely and is not obstructed.
- Clean any dust/debris from fan blades and vents.
Next step
Choose the next step for not turning off; overheating
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
Cooling Fan Motor
Moves cooling air around hot cooking components and electronic controls.
- Typical part-only price
- $35 - $120
- DIY difficulty
- Medium
- Estimated time
- 30-75 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.
Door or Lid Switch
Detects whether the appliance door or lid is safely closed before operation.
Main Control Board
The central brain of the appliance that controls all components, cycles, and timings.
Model-compatible Microwave 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.
Professional Repairs
Replace cooling fan or thermal protection components
Control board/timer circuit replacement
When to Call a Professional
Preventive Maintenance
-
Clean vents and fan regularly: Overheating and fan obstruction
Frequency: every 3 months
Frequently Asked Questions
Why is my LG Microwave not turning off; overheating?
How do I fix LG Microwave not turning off; overheating myself?
How much does it cost to fix not turning off; overheating?
When should I call a technician for not turning off; overheating?
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 door switch preventing the microwave from recognizing when the door is closed or opened.
- Malfunctioning control board that fails to send the off signal to the microwave's power supply.
- Stuck relay on the control board causing continuous power to the microwave.
User Suggested Solutions
-
Inspect and replace the faulty door switch. Open the microwave casing, locate the door switch, and test it with a multimeter. If it's defective, replace it with a new one.
-
Check the control board for any signs of damage or burnt components. If damaged, replace the control board. Ensure all connections are secure.
-
Test the relay on the control board. If it is stuck, it may need to be replaced or repaired. Disconnect power before attempting any repairs.
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
The unit will not turn off unless unplugged and the inside is now HOT.
The issue may be related to faulty door switches.
Source: Reddit r/appliancerepair
User Comments (0)
Share your experience or solution below.
Please login to post a comment.
Be the first to comment!