• ** 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

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WMH73521CS6 No Power even with new fuse, first had open/close door error


Premium Member
Oct 26, 2019
Model Number
1-5 years
Hey everyone,

My WMH73521CS6 was having an open/close door error for a while that would intermittently work. One day I decided to try to take a look at the switches. After I was playing with the switches (none of them were physically broken), the microwave wouldn't power on. It's plugged in, there is power at the outlet, and no breaker was tripped. I also replaced the fuse twice.

What else could keep this from powering on? Is there some safety mechanism that toasted the microwave?

I'll need to see if I can locate the tech sheet and wiring diagram. I'm not familiar with that model.
I found it Rick.:)

I'm attaching it below.



  • W11107277-Shunde MHC service training document 20170302(Print)Rev01.pdf
    2.1 MB · Views: 415
Thanks Jake! aggiebass09, you'll need a DMM to take voltage measurements. You replaced the fuse twice indicates you probably don't have one, correct?
I just asked if bigbuck has it.:)

Awesome BB! Thanks!
@aggiebass09 check for 120 VAC coming out of the noise filter. Then check the door switches for continuity. Be sure to remove the wires from the switch first.
WMH73521 Interlocks.jpg
Last edited:
While the microwave was powered on I manually triggered the top switch on this unit, light came on then everything quickly went dead. No signs of life, any remedy?

Rick has been out sick since Jan.12th with a serious illness, we are hoping and praying for a speedy recovery!

Rick is our Microwave expert, so unfortunately you'll have to wait for him to return or hopefully another tech. or another member that's run across this problem, can help you here.

Wow! Hopefully all is going well and he is getting better.

I tried installing a fuse but it blew immediately. I may try unhooking the door sensor switches and seeing if any short is resolved.

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