FIXED WMH53521HZ3 Microwave starts and cuts off after 2 sec.

[Wx4usa]

While you’re looking, see if you have a fuse near the transformer in a plastic holder like the white one shown in the image. I’ve seen microwaves with this fuse and sometimes it’s not on the schematic or parts list. I have one in the shop now with one in a black holder rather than white and it’s not on the schematic. It will create a run and no heat issue.

 

[Storyteller12]

I just checked and get no120v to the transformer.
So even though all relays tested good out of circuit seems something on the control board is the issue?

Also I did have the fuse but it’s built into the board now. I’m guessing an updated design.

 

[Wx4usa]

No, sir, that is a different fuse. If that one was bad, you’d have no power to the microwave. If you’re getting 120 V to the primary of the transformer and it is shutting down, and all your switches test good, that sounds like you could have an issue in the high-voltage section or the main control board.

 

[Storyteller12]

I’m not getting 120v on the transformer.

 

[Wx4usa]

Sound like board if you’re no longer in demo mode

 

[Storyteller12]

I’m not in demo mode anymore. So most likely the board as you said. I will troubleshoot the board a little more and see if I find something.

Appreciate the help

 

[Storyteller12]

Just to update and mark the thread fixed. The control board W11182110 fixed the problem.