Won’t your Magic Chef microwave turn off or keeps running after you press Cancel or Off? The door switch is the most likely cause. Most models use three or four switches, including the primary door switch, secondary door switch, and monitor switch, which must actuate in sequence as the door closes. A failed or shorted door switch can let the fan run even when the door is open. Test each switch for continuity with a multimeter and replace any switch that fails. If all door switches test good, the user control and display board may not be registering the Cancel button. When some buttons work but others do not, the touchpad and control panel or touchpad may be defective. If the microwave keeps running despite responsive buttons, a shorted relay or triac on the main control board could be supplying power continuously. Any repair that requires opening the outer cabinet is hazardous because the high-voltage capacitor can store a lethal charge even after the microwave is unplugged. Proper capacitor discharge is required, and a qualified technician should handle the repair if you are not familiar with that procedure. Enter your model number to find the exact replacement part for your Magic Chef microwave.
01 - Magic Chef 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 - Magic Chef 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.
03 - Magic Chef 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.
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.
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.)
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.