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Toshiba Microwave turns on by itself

If your Toshiba microwave is turning on by itself, first check whether the touchpad responds correctly. When the touchpad works but the microwave starts without a command, the main control board is the most likely cause and may need replacement. If only the vent fan turns on by itself while you cook on the stovetop, that may be normal: many over-the-range microwaves use a vent fan thermostat to prevent overheating, and the fan should stop after the microwave cools. A faulty interlock switch can also cause a microwave to turn on when the door opens or when it should be idle. Test the interlock switches with a multimeter, then inspect the switch holder behind the control panel for damage or misalignment. Less commonly, intermittent contact between circuits in the touchpad and control panel, or a defective touchpad, can cause the microwave to start unexpectedly. Disconnect power before inspecting components. Any repair that requires removing the outer cabinet exposes a high-voltage capacitor that can store a lethal charge even after the microwave is unplugged. Proper capacitor discharge is required, so use a qualified technician if you are not familiar with the procedure. Enter your Toshiba microwave model number to find the exact replacement part.

01 - Toshiba 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 - Toshiba 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 - Toshiba 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 - Toshiba 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 - Toshiba 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.
Shop all Toshiba Microwave Touchpad Parts
Less Common

Frequently Asked Questions

Why does my Toshiba microwave turn on by itself?
Why does my over-the-range microwave fan turn on by itself?
What should I check if my microwave turns on when the door opens?
Can a microwave touchpad or control board make the microwave turn on by itself?
How do I find the correct Toshiba microwave part for this problem?

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