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Kenmore Microwave turns on by itself

When your Kenmore microwave is turning on by itself, first check whether the touchpad responds correctly. If the touchpad is working, a failing main control board is the most likely cause and may need replacement. On an over-the-range Kenmore microwave, the vent fan can turn on automatically while you cook on the stovetop. This normal cooling feature is controlled by a thermostat and should shut off after the microwave cools. If the microwave starts cooking or the microwave turns on when the door opens, a faulty interlock switch is a common cause. A damaged or misaligned switch holder can also prevent the door switches from engaging correctly. Less commonly, intermittent contact in the touchpad and control panel circuits, or a defective touchpad, can send an unintended start signal. Test the interlock switches with a multimeter and inspect the switch holder if you are comfortable removing the control panel. Opening the outer cabinet exposes a high-voltage capacitor that can store a lethal charge even after the microwave is unplugged. It must be properly discharged before interior work, so use a qualified technician if you are not familiar with that procedure. Enter your Kenmore model number to find the exact replacement part for your microwave.

01 - Kenmore 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 - Kenmore 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 - Kenmore 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 - Kenmore 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 - Kenmore 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 Kenmore over-the-range microwave turn on by itself?
Can a Kenmore microwave fan turn on by itself without a failed part?
Why does my microwave turn on when the door opens or when no one presses a button?
Could the Kenmore microwave touchpad or control board be causing it to turn on by itself?
How do I find the correct Kenmore microwave part for this problem?

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