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Sharp Microwave won't turn off

If your Sharp microwave won't turn off, keeps running, or the fan won't shut off after you press Cancel or Off, start with the door switch. A failed or shorted door switch can allow the fan to run even when the door is open. Unplug the microwave and test each door switch for continuity with a multimeter, but do not open the cabinet unless you understand proper capacitor discharge procedures. If all buttons are unresponsive, the user control and display board may not be registering the Cancel or Off command. If some buttons work while others do not, the touchpad and control panel or touchpad is more likely defective. A failed main control board can also have a shorted relay or triac that keeps components running after the controls are turned off. The high-voltage capacitor can store a lethal charge even after the microwave is unplugged, so interior repairs involving the door switch, control board, or other components require proper discharge and may require a qualified technician. Enter your Sharp microwave model number to find the exact replacement part for your appliance.

01 - Sharp 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 - Sharp 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 - Sharp 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 - Sharp 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 - Sharp 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 - Sharp 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 Sharp microwave turn off?
Can a Sharp microwave turn on by itself because of a bad door switch?
How do I test the door switches if my microwave won't shut off?
What if the Sharp microwave cancel button or touchpad is not working?
How do I find the correct Sharp microwave control board or door switch?

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