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LG Microwave turns on by itself

When your LG microwave turns on by itself, first determine whether only the vent fan is running or the microwave is actually starting a cooking cycle. If the touchpad works normally and the microwave starts without an input, the main control board is the most likely cause and may need replacement. On an over-the-range microwave, a vent fan thermostat can automatically turn the fan on during stovetop cooking to prevent overheating, then shut it off after the unit cools. If the microwave turns on when the door is opened or closed, a faulty interlock switch is another common cause. A damaged or misaligned switch holder can prevent the door switches from engaging correctly. Less commonly, circuits in the touchpad and control panel, or in the touchpad itself, can make intermittent contact and activate the microwave. Inspecting the switch holder or replacing the main control board, touchpad, or control panel requires opening the cabinet. The high-voltage capacitor can store a lethal charge even after the microwave is unplugged, so it must be properly discharged before interior work. Use a qualified technician if you are not familiar with capacitor discharge procedures. Enter your model number to find the exact replacement part for your LG microwave.

01 - LG Microwave Main Control Board

First, make sure that the touchpad is working properly. If the touchpad is working properly, the main control board is likely at fault. If the control board is defective, replace it.
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Top Solution

02 - Microwave cooling down during stovetop cooking

Most over-the-range microwaves have a vent fan thermostat that will turn the vent fan on automatically to keep the microwave from overheating. The fan will shut off after the microwave cools back down.
Highly Likely

03 - LG Microwave Interlock Switch

A microwave that turns on by itself can be caused by a malfunctioning interlock switch. You can use a multimeter to test the interlock switches to determine if they are functioning appropriately and replace if necessary.
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Common

04 - LG Microwave Switch Holder

The microwave switch holder is the component that houses the door switches behind the control panel. If the switch holder is damaged or misaligned, the switches may not be properly engaged which could cause the microwave to turn on by itself. You will need to uninstall the control panel and inspect the switch holder to confirm it is in good condition and secured properly. Replace the switch holder with a new one if necessary.
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Common

05 - LG Microwave Touchpad and Control Panel

It’s possible that the touchpad and control panel button circuits are coming into contact with each other intermittently which could cause the microwave to turn on by itself. If this happens, the touchpad and control panel will need to be replaced.
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Less Common

06 - LG Microwave Touchpad

It’s possible that the touchpad button circuits are coming into contact with each other intermittently which could cause the microwave to turn on by itself. If this happens, the touchpad will need to be replaced.
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Less Common

Frequently Asked Questions

Why does my LG over-the-range microwave turn on by itself?
Why does my LG microwave turn on when the door opens or when the door is closed?
How do I know if the LG microwave touchpad or control board is causing it to turn on by itself?
How can I find the correct LG microwave interlock switch or control board?
Is it safe to open an LG microwave that keeps turning on by itself?

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