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Jenn Air Microwave turns on by itself

If your Jenn Air over-the-range microwave is turning on by itself, first check whether only the vent fan is running. During stovetop cooking, a vent fan thermostat can turn the fan on automatically to cool the microwave, then shut it off when the unit cools. If the touchpad works correctly and the microwave is starting or operating without input, the main control board is the most likely cause and may need replacement. A faulty interlock switch can also cause a microwave to turn on by itself, especially when the door opens or closes. Next, inspect the switch holder behind the control panel. If it is damaged or misaligned, the door switches may not engage correctly. Less commonly, intermittent contact in the touchpad and control panel button circuits, or in the touchpad itself, can trigger the microwave. Enter your Jenn Air microwave model number to find the exact replacement part for your appliance. Before removing the outer cabinet or testing internal components, unplug the microwave and note that its high-voltage capacitor can store a lethal charge even after unplugging. The capacitor must be properly discharged before interior work, so this repair may require a qualified technician if you are not familiar with capacitor discharge procedures.

01 - Jenn Air 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 - Jenn Air 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 - Jenn Air 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 - Jenn Air 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 - Jenn Air 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 Jenn Air over-the-range microwave turn on by itself?
Is it normal for my Jenn Air microwave fan to turn on by itself?
How do I test the interlock switch or switch holder on a microwave that turns on by itself?
Could the touchpad or control board cause a Jenn Air microwave to turn on by itself?
How do I find the correct Jenn Air microwave part for this repair?

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