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Litton Microwave turns on by itself

If your Litton microwave turns on by itself, first check whether the touchpad is responding correctly. When the touchpad works but the microwave starts or operates unexpectedly, the main control board is the most likely cause and should be replaced. If your Litton is an over-the-range microwave, the vent fan may turn on automatically while you cook on the stovetop. A vent fan thermostat activates the fan to cool the microwave and shuts it off once the unit cools, which is normal operation. If the microwave itself starts heating, test the interlock switches with a multimeter. A defective interlock switch can signal the microwave to run without a command. Next, inspect the switch holder behind the control panel. If it is damaged or misaligned, the door switches may not engage correctly. Less commonly, shorting circuits in the touchpad and control panel, or in the touchpad alone, can cause this symptom. Replace the Litton touchpad and control panel or touchpad as needed. Enter your model number to find the exact replacement part for your microwave. Any repair requiring the outer cabinet to be opened must be handled carefully because the high-voltage capacitor can store a lethal charge even when unplugged and must be properly discharged. A qualified technician may be needed if you are not familiar with capacitor discharge procedures.

01 - Litton 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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Shop all Litton Microwave Main Control Board Parts
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 - Litton 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 - Litton 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 - Litton 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 - Litton 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 Litton microwave turn on by itself?
Why does my microwave turn on when the door opens or start cooking by itself?
How do I test a Litton microwave interlock switch or switch holder?
Could the Litton touchpad or control panel be causing the microwave to turn on by itself?
How do I find the correct Litton microwave part for this problem?

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