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Quasar Microwave won't turn off

If your Quasar microwave won't turn off, keeps running, or seems stuck on after you press Cancel or Off, start with the door switches. A failed primary, secondary, or monitor switch can short and keep the fan running, even when the door is open. Test each door switch for continuity and replace any switch that fails. If the switches test good, the user control and display board may not be registering the Cancel button. If all buttons are unresponsive, replace the user control and display board. If some buttons work but others do not, the touchpad and control panel or touchpad may be defective. A less common cause is a failed main control board, where a shorted relay or triac continues sending power to the microwave components. Enter your model number to find the exact replacement part for your Quasar microwave. Any repair that requires opening the outer cabinet must be handled carefully. The high-voltage capacitor can store a lethal charge even after the microwave is unplugged, so it must be properly discharged before interior work. If you are not familiar with capacitor discharge procedures, have a qualified technician perform the repair.

01 - Quasar 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 - Quasar 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 - Quasar 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 - Quasar 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 - Quasar 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 - Quasar 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 Quasar microwave turn off?

Can a bad door switch make a Quasar microwave keep running?

What should I check if the Quasar microwave Cancel button or touchpad is not working?

Is it safe to repair a Quasar microwave that won't shut off?

How do I find the right Quasar microwave part for this repair?

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