Question about Jenn-Air JMC8130DD Microwave Oven

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Jenn-Air Microwave - no power

We have a built-in Jenn Air Unit that includes Microwave (Model JMC8130DDS) and Oven under it. The oven works just fine, but the Microwave shows no power. I thought it is probably a fuse problem, but I can't figure out how to get to the fuse. Please advise.

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Had the same problem. Removed the unit (snapping off the upper and lower trim rings was a chore but they do snap off) and tested the power. Plug behind the unit was good. Pulled the cover and checked the thermal fuse with ohm meter. No good. Replaced fuse, microwave would run for a second, then light goes dim and it buzzes, then it blew the fuse. Per above suspected Capacitor. Changed that, and we are back up and running. Thanks!!

Posted on Sep 27, 2008

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A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.

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.

The TCOs you need to be concerned usually with have all black or white wires only. Please reply with photos if you have questions.

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

If it went dead a few 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.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

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.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Sep 16, 2008

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Manual for jenn air microwave jmc8130dds


Like most manufacturers these days, Jenn-Air offers manuals online. I did not see specific instructions for removing the panel, but here is a link to the parts diagram which may offer some hints. You can also call or chat online with Jenn-Air Customer Care.

http://shared.whirlpoolcorp.com/assets/pdfs/literature/Repair%20Part%20List%20-%20JMC8130DDS.pdf

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Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101 [][
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The fuse for this model is on the filter board on top of the internal cooling fan frame.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven (JMC8130DDS) here.

If the fuse tests good, then the oven cavity thermostat, magnetron thermostat, and control circuit board (which we repair) are other parts that can make the oven dead.

Accessing some components (especially the oven cavity thermostat) for testing and possible replacement will require you to remove the oven from the wall and take off the outer cover.

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

You can download Jenn-Air owner's manuals and installation instructions here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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I'm afraid since Jenn Air has become a division of Whirlpool (along with numerous others) the quality has suffered.
I was going to suggest that you purchase a service manual for your unit so you could 'reset' it yourself. Service manuals can cost from $12-$40 US and in many cases obviate the need for 'professional' service calls. However, I couldn't find one offered for your model number so your only choices are to continue to pay for 'service' or examine the guts visually to see if you can locate any reset feature. This is what I would do.
When microwaves fail, older ones generally need a diode, a big capacitor or the magnetron replaced. Newer units are suffering power supply failures as many have moved from the reliable but less efficient 'linear' power supplies to 'switched mode' types that are more efficient but more complex and prone to failure. These later types usually have the word 'inverter' in the model description.     

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