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Tappan Microwave won't turn off

When a Tappan microwave won't turn off, the door switch is the most likely cause. A failed primary, secondary, or monitor door switch can short and keep the fan running, even when the door is open. Test each door switch for continuity with a multimeter and replace any switch that fails. If the switches test good, the cancel or off button on the user control and display board may not be activating. A defective touchpad and control panel or membrane switch is also possible, especially when some buttons respond while others do not. If none of the microwave buttons work correctly, the user control and display board may need replacement. Less commonly, a relay or triac on the main control board can short, causing the microwave or fan to keep running after you press cancel. Enter your model number to find the exact replacement part for your Tappan microwave. Any repair requiring the outer cabinet to be removed must be handled carefully because the high-voltage capacitor can store a lethal charge even after the microwave is unplugged. Proper capacitor discharge is required before interior work, and a qualified technician should perform repairs if you are not familiar with that procedure.

01 - Tappan 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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Top Solution

02 - Tappan 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 - Tappan 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 - Tappan 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 - Tappan 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 - Tappan 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 Tappan microwave turn off?
How do I test a Tappan microwave door switch when it keeps running?
Why does my Tappan microwave keep running when the Cancel or Off button does not work?
Can a Tappan microwave control board cause it to keep running?
How do I find the correct Tappan microwave door switch or touchpad?

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