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Panasonic Microwave turns on by itself

If your Panasonic microwave is turning on by itself, first check whether the touchpad responds normally. If it does, the main control board is the most likely cause and may need replacement. On an over-the-range Panasonic microwave, the vent fan can turn on automatically while you cook on the stovetop because a thermostat senses heat and protects the microwave from overheating. The fan should shut off after the microwave cools. If the microwave starts heating or running unexpectedly, a faulty interlock switch is another likely cause. A damaged or misaligned switch holder can keep the door switches from engaging correctly, while intermittent contact between circuits in the touchpad and control panel can also cause the microwave to turn on by itself. Less commonly, the touchpad alone is defective. Enter your model number to find the exact Panasonic replacement part for your microwave. Any repair that requires removing the outer cabinet must be handled carefully because the high-voltage capacitor can store a lethal charge even after the microwave is unplugged. It must be properly discharged before interior work, and this repair may require a qualified technician if you are not familiar with capacitor discharge procedures.

01 - Panasonic 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 - Panasonic 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 - Panasonic 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 - Panasonic 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 - Panasonic 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 Panasonic microwave turn on by itself?
Why does my over-the-range Panasonic microwave fan turn on by itself?
How do I test a Panasonic microwave interlock switch?
Can a Panasonic microwave touchpad or control board cause it to turn on by itself?
How do I find the correct Panasonic microwave part for this problem?

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