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Amana Microwave turns on by itself

An Amana microwave is turning on by itself, first determine whether the vent fan is running or the microwave is actually starting a cooking cycle. On an over-the-range Amana microwave, the vent fan may automatically turn on during stovetop cooking when a thermostat detects heat, then shut off after the microwave cools. If the microwave turns on by itself when the door is closed or begins operating without a command, check that the touchpad responds correctly. A defective main control board is the most likely cause when the touchpad works properly. A malfunctioning interlock switch can also cause a microwave to turn on by itself, so test the door switches with a multimeter. Next, inspect the switch holder behind the control panel for damage or misalignment that prevents the interlock switches from engaging correctly. Less commonly, intermittent contact in the Amana touchpad and control panel or the touchpad itself can send an unintended start signal. Enter your model number to find the exact replacement part for your Amana microwave. Any repair that requires opening the outer cabinet must be handled carefully because the high-voltage capacitor can store a lethal charge even after unplugging. Proper capacitor discharge is required, and a qualified technician may be needed if you are unfamiliar with the procedure.

01 - Amana 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 - Amana 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 - Amana 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 - Amana 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 - Amana 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 Amana microwave turn on by itself?
Why does my Amana microwave fan turn on by itself?
How do I test the door switch on an Amana microwave that turns on by itself?
Should I replace the Amana microwave control board or touchpad first?
How do I find the correct Amana microwave part for this repair?

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