The built-in Jenn Air microwave in our new-to-us house recently stopped working. No buttons responded, no lights came on, even the clock didn’t work.

When we started shopping for replacement microwaves, we got an unpleasant surprise.  This unit is built-in to the wall, and matches the oven below it, so it is an uncommon size.  Also, Jenn Air is a premium brand, so instead of $200 for a more commonly available replacement, we got a quote of $1500 to $2000 to replace this one.  This was not good news at all.

So, with a non-working microwave, and nothing to lose, I started taking it apart to see if there was something simple I could fix myself, like a fuse.  It turns out I was in luck.  Obviously lots of other things might be wrong with a microwave, but it’s always best to check the simplest things first.  If your device has no functions at all, that seems like it could be a fuse. 

A word of warning: if you are not experienced taking apart electronics, don’t get in over your head.  Use common sense, make sure to unplug everything, be careful, and take pictures to remember how things go back together. This is a Jenn Air built-in, model KCRxxx, but lots of other brands use similar construction.

1. Remove the Trim Kit

Mine was held on with six screws, circled in red in the picture.

Trim KitCredit: Gibbon

2. Remove the oven From the Wall

I removed 2 screws from underneath, and then pulled the microwave part way out, and my lovely assistant unplugged it.  Then I could pull it all the way out and place it somewhere I could work on it.

3. Remove the Outer Case

It was held on by 3 screws at the rear, and slides backwards similar to a computer case.

4. Find the Fuse

I worked my way from the power cord in, until I found the fuse, and removed it. I set my multi-meter to read resistance, on the 1000 ohm scale.  A good fuse should read very close to zero resistance.  My meter jumped to the top of the scale, meaning I had a blown fuse.

Fuse HolderCredit: Gibbon

5. Replace the Fuse

Be sure to match the voltage and amperage.  I bought a bag of 4 replacement fuses at Radio Shack for less than $4. Once the new fuse is in, you can plug it in and try it out.  Mine worked perfectly.

6. Re-install the Oven

Put the case back on, and put the oven and trim kit back in place. You may need an extra set of hands to plug the cord in while you hold the oven.

Give yourself a high-five! If you’re lucky like I was, you just saved yourself hundreds if not thousands of dollars.