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Toshiba Microwave won't turn off

If your Toshiba microwave won't turn off, keeps running, or seems stuck on after you press Cancel or Off, start with the door switch, the most likely cause. A failed door switch can short and let the fan run even when the door is open. Test each door switch for continuity with a multimeter and replace any switch that fails. If all buttons are unresponsive, the user control and display board may not be registering the Cancel command. If some buttons work but others do not, the touchpad and control panel or the separate touchpad may be defective. A less common cause is a failed main control board, where a shorted relay or triac can keep the fan or another component running after the controls are turned off. Enter your model number to find the exact Toshiba replacement part for your 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 the microwave is unplugged. The capacitor must be properly discharged before interior work, and anyone unfamiliar with that procedure should use a qualified technician.

01 - Toshiba Microwave Door Switch

Most microwaves have three or four door switches. When the microwave door closes, the door switches actuate in sequence to ensure that the door is closed properly. If any of the door switches fail, the microwave will not start or heat. In some rare cases a door switch may short out and allow the fan to run even when the door is opened. To determine if any of the door switches are defective, use a multimeter to test each of the switches for continuity. If any of the door switches lack continuity, replace the switch. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even ...after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace a door switch.)

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02 - Toshiba Microwave User Control and Display Board

The cancel or off button on the user control and display board may not be activating. To determine if the control and display board is defective, try pressing each of the buttons on the control panel. If none of the buttons are responding correctly, replace the user control and display board.

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Highly Likely

03 - Toshiba Microwave Touchpad and Control Panel

The cancel or off button on the control panel may not be activating when it's pressed. To determine if the touchpad and control panel are defective, try pressing each of the buttons on the control panel. If some of the buttons respond correctly while others don’t, replace the touchpad and control panel.

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Common

04 - Toshiba Microwave Touchpad

The cancel or off button on the touchpad may not be activating. To determine if the touchpad is defective, try pressing each of the buttons on the control panel. If some of the buttons respond correctly while others don’t, replace the touchpad.

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Common

05 - Toshiba Microwave Main Control Board

The main control board has relays that send power to several components to make the microwave work. If one or more of the relays or triacs short out, some of the components can keep running when the controls are turned off. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the main control board.)

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Common

06 - Toshiba Microwave Control Board

The control board has relays that send power to several components to make the microwave work. If one or more of the relays or triacs short out, some of the components can keep running when the controls are turned off. While you can often replace just the control board, some microwave models sell control panels as an assembly with both the touchpad and control board included.

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Uncommon But Possible

Frequently Asked Questions

Why won't my Toshiba microwave turn off or stop running?

Can a Toshiba microwave turn on by itself or run with the door open?

How do I test a Toshiba microwave door switch or touchpad that will not stop the microwave?

Should I replace the Toshiba microwave control board if it keeps running?

How do I find the correct Toshiba microwave door switch or control part?

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