Question about Microwave Ovens
If it went dead almost
immediately after pressing the Start pad, that's usually a shorted
If it went dead several seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.
If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.
Then when it cools, it closes the circuit and allows power through again.
When checking TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.
So don't let that fool you.
You can usually find exploded views and order parts by entering your model number at the Sears parts site.
BUT once you have the part number from the Sears site, you can often get the parts cheaper here.
Let us know if you more help.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Aug 23, 2010
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Posted on Jan 02, 2017
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