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Microwave oven - how to replace fuse

My oven died today when I pressed the add a minute button. It's probably a blown fuse. Where is it located, so I can check it? (Kenmore 721.66319500)

Penny

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  • gary paterson Jan 06, 2009

    how can you test the transformer and so on???

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  • Microwave Ovens Master
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You can usually find an exploded view by entering your FULL model number (721.66319500) here.

But there's usually a reason the fuse blows!

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor too.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer too.

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 you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

Please write back with more details if you need further help.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on May 30, 2008

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At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Accessing some components (especially an oven cavity TCO / thermostat) for testing and possible replacement will require you to remove the oven from the wall.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

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Safety first! Unplug before taking apart. Put back together before plugging back in (unless you know what you are doing).

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