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HomeRepair HelpLG Microwave RepairLG Microwave shuts off after a few seconds Repair

LG Microwave shuts off after a few seconds

When your LG microwave shuts off after a few seconds, an intermittently failing door switch is the most likely cause. Inspect each door switch for overheating, arcing, or burned areas, then use a multimeter to check continuity. Replace any switch that is damaged or tests intermittently. A failing micro switch can cause the same microwave stops after 3 seconds or microwave turns off after a few seconds symptom, so test these switches as well. If the switches work properly, the main control board may be defective, but control boards are often misdiagnosed and should be checked only after the door switches and other likely parts. A faulty touchpad and control panel or membrane touchpad is less common, especially when the display works and some buttons respond while others do not. Enter your LG microwave's model number to find the exact replacement door switch, micro switch, control board, or touchpad for your appliance. Unplug the microwave before service. Any repair that requires removing the outer cabinet exposes a high-voltage capacitor that can store a lethal charge even after unplugging. The capacitor must be properly discharged before interior work, so use a qualified technician if you are not familiar with capacitor discharge procedures.

01 - LG Microwave Door Switch

A door switch might be failing intermittently. Check each of the door switches for signs of overheating, arcing, or burning. If you don’t see any obvious signs of failure, use a multimeter to test each switch for continuity. If any of the switches is visibly damaged or only has intermittent continuity, replace it.
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Top Solution

02 - LG Microwave Micro Switch

A micro switch might be failing intermittently. Check each of the micro switches for signs of overheating, arcing, or burning. If you don’t see any obvious signs of failure, use a multimeter to test each switch for continuity. If any of the switches is visibly damaged or only has intermittent continuity, replace it.
Shop all LG Microwave Micro Switch Parts
Top Solution

03 - LG Microwave Main Control Board

Control boards are often misdiagnosed—before replacing the control board, first check more commonly defective parts, particularly the door switches. If all of the other components are working properly, replace the control board.
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Top Solution

04 - LG Microwave Touchpad and Control Panel

To determine if the touchpad and control panel are defective, try pressing each of the buttons on the control panel. If some of the buttons respond correctly while others don’t, replace the touchpad and control panel.
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Highly Likely

05 - LG Microwave Touchpad

If the microwave runs for a few seconds and stops the touchpad might be at fault. This is not common. Generally speaking, if the microwave display is working and some of the buttons respond correctly but some don’t, the problem is with the touchpad.
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Highly Likely

06 - LG Microwave Control Board

Control boards are often misdiagnosed—before replacing the control board, first check more commonly defective parts, particularly the door switches. If all of the other components are working properly, replace the control board.
Shop all LG Microwave Control Board Parts
Common

Frequently Asked Questions

Why does my LG microwave shut off after a few seconds?
How do I test an LG microwave door switch that makes the microwave stop after 3 seconds?
Could the LG microwave touchpad or control board be causing it to shut off?
Is it safe to repair an LG microwave that shuts off after a few seconds?
How do I find the correct LG microwave door switch or control part?

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