Microwave magic?

Lou Schneider

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Mar 14, 2005
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The 2008 DRV 5th wheel I use as a home base came with a large, no-name microwave over the stove that includes a hood vent and light. As far as I know it's the original equipment.

Several months back I accidentally let it run without anything inside and after a few minutes it shut down, dead. No clock, no light, no vent fan, nothing. I let it sit for several minutes in case it tripped an overtemperature thermal breaker that would reset itself. No luck.

I figured the best case was an internal fuse I could replace after wrestling the microwave down from it's mount over the stove. Worst case would be a new microwave at $600-1000+ depending on whether I got one with a convection oven.

I had a freezer full of microwave frozen food I needed to deal with, and while shopping at our local Wal-Mart I saw they had small 700 watt countertop microwaves on sale for $40. What the heck, it would serve until I decided what to do about the big one. The little microwave worked remarkably well and I put off dealing with the big one.

Yesterday I finally decided to take the big one down and see what was up. Before I did that I plugged it in and guess what, it started working.

A couple of days ago I saw a YouTube video about portable electric heaters and it said they include overtemperature cutouts that stay disconnected until power is removed from the unit. It's a thermal breaker with a little heating element inside that keeps the breaker hot and open after it trips until power is removed and it can cool down..

Apparently the microwave has a similar overload which only resets itself after sitting unplugged for a while. Who'd a thunk?
 
Humm the Microwaves I've worked on never had such a system but .... that's not saying they can't.
I have seen circuit breakers that once the open they stay opened till the load is removed (Short stop) One of them was driving me batty on the motor home due to a wire being hooked to it instead of the port it was supposed to hook to.. Finally figured it out.. Thank whomever decided to print labels on the wires. New breaker and all good (Breaker was bad)
 

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