• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

  • Please note, some of the links on our site are affiliate links (Learn More)
  • Important Announcement

    It's with sad news to announce that our site owner, Jake, has passed away. You can read the details here.

Need help troubleshooting a Whirlpool WMH78019HZ Microwave


Premium Member
May 23, 2023
Model Number
1-5 years
The issue I'm having is when I open the door the display goes black but strangely you can open the door and the display will not turn off until you swing the door maybe halfway opened then the display goes black when you close the door completely it comes back on. I already replaced the door Interlock Switches which fixed The door open / not closed won't start issue I was having before. But now I'm having this other issue so I tried replacing the Interlock Switches again but this time it didn’t fix it.

Below is a video of the issues I'm having

Whirlpool WMH78019HZ

Last edited:
Someone likely needs to inspect the wiring going to the door, especially where it flexes when the door opens and closes. There might be a loose connection or a break, resulting in an intermittent connection. I can't see the door switches having anything to do with such a malfunction.

I am not familiar with that model to say where to look or how to access the necessary areas. Sorry.


Dan O.

Users who are viewing this thread

Support Our Site

If you feel that you have benefited from this site, and would like to show your appreciation, please consider making a donation.