Question about Jenn-Air JMV8208A Microwave Oven

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Microwave appears dead, kid tried to melt crayons, no power, Check GFI and fuse box, all appear fine. Is there a reset button? 36: Mode; # JMV8208AAS

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There is a ceramic fuse located on the inside of the microwave oven, unplug unit remove cover "2 to 6 screws" allow 30 seconds for the high voltage to discharge, on the right side you will see a keyboard, to the left of that you should notice a silver capacitor rectangular in shape, fuse will be near by, "whitebody with silver ends" remove and take it to a Radio Shack Store or an Appliance repairman to properly size up. When you assemble, plug unit in, "remember there are dangerous high voltages if left exposed" so make sure the top is on before using.

Posted on May 26, 2011

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1 Answer

My microwave is not heating


Are you sure you have power at the outlet? If not check your circut breaker box. You may have a GFI circut. The GFI outlets are very sensitive. They have reset button and test button. If other "non GFI" outlets are on the same cirute they are affected by the GFI outlet. The GFI outlets do fail at times, and need to be replaced. Have you had recent power outage? Sometimes our "smart devices" are too smart.
If you have power, I'd unplug for a few hours and see if that might reset it's "brain" If that doesn't help you may have a panel problem. Owner's manual? Check troubleshooting section. Warranty?, pursue that. Age of microwave? Consider the cost of repair vs. finding a lightly used "working" microwave.

Mar 03, 2015 | Microwave Ovens

1 Answer

LCD pad, numbers do not appear clearly but as a distorted image. example 1:10 may appear as blank.1E example .40 may appear as blank.1L microwave works fine just the read out panel is distorted,...


On most recent Sharp microwaves, the fuse only interrupts main power, so if the fuse is blown, it will be totally dead.

The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes then try it.

Then chances are you have a failed microwave display. Unless this is an over the range, touch screen, or convection type, it's probably not worth repair, but you can get more information on such repairs here.

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


Jan 15, 2011 | Sharp R-310CW 1100 Watts Microwave Oven

1 Answer

No power everything was fine then nothing when i got home is there any fuses to check in the microwave


There is a fuse under the cover, as well as a couple of safety thermostats that can cause a dead oven. It may also be that the power transformer for the control circuit board has failed. I've seen several Sharp ovens where the transformer died because of power surges. This would cause no display and no functions even though the oven has power. Also, did you make sure the outlet your oven is plugged into has power? If it's a GFI outlet it may need to be reset, or a circuit breaker in your electric service panel may have tripped.

Hope this helps, and thanks for using Fixya!

Feb 28, 2010 | Sharp R-1850A Convection/Microwave Oven

1 Answer

The microwave does not react what so ever. Checked the fuse and its fine, what could be the problem? please help


Is there power at the outlet? You say you checked the fuse ... is that the one inside the machine? Is the outlet protected by a GFI (reset for a GFI is on the GFI)? A GFI looks like a ordinary outlet but is very sensitive to electrical irregularities. Your circuit breaker may be on or your power panel fuse may be fine and the fuse inside your oven may be fine. If the GFI is popped, you have no power.

Try some other electrical device in the outlet. Does it work? Try an extension cord from a known hot outlet?

Beyond these tips, you may need professional help with this.

Thanks for your interest in FixYa.com

Jan 22, 2010 | LG LMV1630ST Microwave Oven

1 Answer

Danby Microwave, stopped working, no power, would it be a fuse?


check the gfi it might have tripped that or a fuse if its neither its dead I work in a kitchen and burned up plenty of micros over the last 13 yrs

Dec 02, 2009 | Danby DMW1153 Microwave Oven

2 Answers

Dead Microwave


Check your plug and change the fuse there also.

You might need to rechange the 20 amp 250v fuse behind the control panel again due to the recent spark.

If none of this works then i'm afraid a certified technician needs to check the power packs and boards

May 22, 2009 | KitchenAid KHMS155LSS 1000 Watts Microwave...

1 Answer

Microwave went dead


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.

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.

You should also check the high voltage rectifier diode to be sure it's not shorted too: http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)

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.

You can find an authorized Panasonic servicer here. You can order Panasonic parts from Tritronics, but if you don't find what you're looking for there, try here.

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

Nov 02, 2008 | Panasonic Microwave Ovens

1 Answer

Power outage - Hurricane Ike - is there a reset button?


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.

Sep 14, 2008 | Maytag MMV5207AAS Microwave Oven

1 Answer

GE Microwave - Power Cord Appears to be Dead


Most microwave ovens are equipped with an internal fuse. This is typically located where the power cord enters the cabinet. The cabinet will have to be opened to verify the fuse.

The magnetron is not directly attached to the power source, it has to be stepped up in voltage significantly, either through a transformer or inverter.

It is usually best to have professional tech check the fuse for operation. Most shops will do this for a small fee if you drop the unit off yourself.

Jul 28, 2008 | GE JE1860 Microwave Oven

1 Answer

Replacing the fuse of a MCO160UW


A microwave can be dead for many reasons.

It may be the fuse, which is usually located 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 thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

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 may 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.

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

Jul 15, 2008 | Magic Chef CMV1000B Microwave Oven

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