Question about Jenn-Air JMC7000 Microwave Oven

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I have a Jenn-Air M167 that has consistently blown internal fuse over the years. However it is now blowing them on one use of the microwave. I have replaced 4 this week. Any thoughts on why the fuse is being blown and what part might be causing the problem?

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  • jlrogers200 Aug 07, 2009

    When that was happening for me, the problem was that the holder for the fuse was loose and shorting out. I had that replaced and it is now working fine.

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Try the solution posted on this very site for your problem:
http://www.fixya.com/support/t503886-jenn_air_microwave_fuse_jenn_air_model

Posted on Jul 13, 2009

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1 Answer

Can I replace an internal thermal fuse in my jmc7000 jenn-air microwave?


It doesn't have a thermal fuse, but it has a 20A ceramic fuse and on or around the magnetron it has a thermostat.

The 20A fuse (if blown) can be had in local appliance parts store, and places like Lowe's Home Depot, and Wal-Mart.

For the fuse and/or thermostat, you can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

If the fuse is blown and it blows again, it may be a loose fuse holder, shorted high voltage capacitor, or door switch trouble.

If the thermostat failed, it's due to a magnetron overheating due to the internal cooling fan's not working, or just the magnetron itself going bad.

As a bonus, you can find your owner's manual online here free.

If you need further free help, let us know.

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

Oct 06, 2011 | Jenn-Air JMC7000 Microwave Oven

1 Answer

I have jenn-air microwave oven model m167. Unit will come on and all programming works to heat food. Oven acts as if it is heating food,however it does not cook or heat food items. Any help with...


It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

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My JENN-AIR Microwave Oven stop working, no light is coming in front pennel, I checked power exist in wall outlet, I suspect some kind of fuse blown into microwave oven, my microwave oven make & model...


Hi, my name is Audrey and I am a Jenn-Air employee. I would appreciate the opportunity to assist you with your microwave. Please send me an email through our customer service address,

NAR_JennAir_CustomerExperience@JennAir.com

and type 'Attention: Audrey' in the subject line. Please include your full name, phone number, and model/serial number, and I will look into the issue for you.

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I have a blown internal fuse on my JennAir M170b microwave. The fuse holder says 250V, 15A fuse, but the fuse that was in there is a 125V, 15A fuse. The micro plugs into a normal 110V circuit. Which type...


Hi,

The information on the fuse is the maximum rating. The holder may not match the rating.

The 'A' is the very important part of the size. You will need a 15 Amp fuse. The best fuse to use is 'ceramic'. You can find them at Radio Shack in the back of the store there are drawers with electrical parts.

15 Amp ceramic

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Check the capacitor with an ohmmeter, if the meter reads 0 ohms the capacitor is bad and needs to be replaced. More likely, though, the magnetron is bad.

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HOW TO REPLACE BLOWN FUSE


Look for a reset button on the back--push to reset. If trips again, unit has probable short.

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Took microwave out, opened back, 15amp fuse blown. Replaced all ok.

Jul 06, 2009 | Microwave Ovens

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Is the interior flaking the only problem with it?

It can be sanded smooth and clean and dried thoroughly, then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.

Otherwise, if you want to replace it, I would suggest contacting Jenn-Air Customer Care here and telling them your model number.

They can probably give you the model number of a new "drop-in" replacement.

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

Dec 12, 2008 | Jenn-Air JMC7000 Microwave Oven

3 Answers

JMC7000ADW Blows circuit breaker


I've had this problem twice with our microwave. The hint to where the problem lies is that the breaker blows when you open the door at times. Inside the microwave are three microswitches; primary and secondary interlock micro switches and an Interlock Monitor switch. The switches are supposed to shut down the microwave if it is running and the door is opened. But, I've found the upper primary switch can stick internal at times and when the door is opened the stuck switch will, because of the way it is wired as a safety switch, cause either the fuse or possibly the main circuit breaker for the oven to pop. The reason the stuck switch blows the breaker or fuse is when the door is opened the interlock switch will cause the neutral wire from the AC power to be applied to the Upper Primary Interlock switch which normally should be open when the door is opened, but if the switch is intermittent or the contacts weld themselves shut the neutral line is connected direct to the "hot" side of the power line through the fuse and thermostat. The first time my microwave failed the switch had melted the contacts together inside the switch and the second time the switch became intermittent and would blow the breaker to the over ever so often. I suspected the switch the second time this happened and utilizing an ohm meter I checked the switch several times by opening and closing the door and once in a while it would remain closed instead of opening when the door was opened. Of course while trouble shooting the power cord to the microwave must be disconnected and use all safety precautions when working around the high voltage areas inside the microwave. I wrote Jenn-Air about the bad switch and the way it is wired into the circuit, but never received any acknowledgement. I suspect these microswitches are under rated for the amount of current that passes through the switch, thus they overheat and eventually arc the contacts together. I hope this helps explain the intermittent problem and could explain many of the intermittent blown fuse problems I see in these internet help sessions

May 09, 2008 | Jenn-Air JMC7000 Microwave Oven

1 Answer

JENN AIR MICROWAVE FUSE (JENN AIR MODEL M167)


The fuse holder may be loose.

With the microwave unplugged, if you can easily turn the fuse with your thumb & forefinger while it's in the holder, it has overheated and fatigued and should be replaced.

Simply squeezing its terminals together with pliers is not really a good solution.

When a connection is loose, heat results, which eventually melts the fuse internally.

This is usually evidenced by a very tiny ball of solder at the point where the end cap meets the body of the fuse.

You can use a generic holder - it's a lot cheaper than ordering one. The connectors should be 1/4" tabs and it should be rated at 20 amps or better.

You should be able to get one from a home center or local appliance parts store.

If it's not loose, then it may be a failing magnetron or high voltage transformer pulling too much current.

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

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