Question about Emerson MW8778 Microwave Oven

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Microwave won't work

Microwave won't stop running, stop button will not even stop it

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  • William Miller
    William Miller May 11, 2010

    Chances are you have a bad door switch or door switch mount, a misaligned door, or a stuck relay on the control panel.

    When it's running (but shouldn't be) is it cooking?

    Is the inside light on?

    Is the cooling fan on?

    Is the turntable turning?


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  • 71 Answers

You can replace the keypad,maybe it is corroded. try to replace.

Posted on Sep 16, 2009

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Step 1:


Door Switch




If the microwave runs for a few seconds and then shuts off, a door switch might have failed intermittently. Check each of the door switches for any signs of overheating, arcing, or burning. Also check each of them for continuity. Replace any of the switches that is visibly damaged or that only has continuity intermittently


mwswitchtest2.jpg

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If the microwave runs for a few seconds and stops there may be a short circuit in the main control board. Check other components first, these boards are often misdiagnosed.


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If the microwave runs for a few seconds and stops the touchpad and control panel might be defective. There are several other components that can cause this problem, be sure to check any other components before replacing this board.

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If the microwave runs for a few seconds and stops the thermostat might be defective. Watch our video on testing thermostat

Step 3:

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Step 4:

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Step 5:

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Step 6:

use the DVOM tester and fix it. God bless you

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Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

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heatman101

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