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Electrical arc discharging from the top, inside oven, causing burned spot in top of cooking enclosure

When trying to cook, an electrical arc discharges from a sopt in the top inner surface of the enclosure, downwars tord the bottom of the oven interior. Problem began intemittently, and would only leave a small spot of soot on the top of the oven. After cleaning the soot, and covering the item being cooked, the oven would operate normally. Now the problem has gotten to the point where it is constant, and there is a hole, maybe the size of a dime, burned through the top inner surface of the cooking chamber. Can this be repaired, or is it "toasted"?

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You may be able to repair that with a high quality epoxy.
Just make sure you read the package to be sure the eopxy contains no metalic substances.
I think you could succesfully repair it.

Posted on Mar 22, 2008

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Posted on Jan 02, 2017

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Sparks when cooking


Make sure no metal item (forks-spoons or oven rack) is touching the outer wall of the microwave. That will cause sparks. If all that is OK then there is usually a metal fan type blade in the microwave top called a stirrer blade that may be out of place and rubbing the cavity causing sparks. Try to pin point the spark area so you know where to look for the problem. Sparks usually mean metal is touching metal somewhere.

Mar 29, 2015 | Whirlpool MH7135XE Microwave Oven

1 Answer

My microwave arcs every time I try to heat something. The silver colored plate on the interior right side of the cabinet appears to be burned. What happened and can it be fixed?


This arcing is caused by food splatter when something 'popped' or 'exploded' during an earlier cooking cycle. The food particle remained and every time the microwave gets used, this particle continues to cook until it turns into carbon. This can be as small as the tip of a pin. Carbon reacts very violently to RF energy (which is what causes the food to heat). You need to carefully remove the "waveguide cover". Clean it and check for a burned spot. You also need to inspect the inside of the "waveguide" once the cover is off. Clean it also. Make sure there is no grease or other foreign matter inside there and be sure not to leave anything in there (paper towel piece, etc..). If any of the paint inside the waveguide is burned, and if it can't be sanded off and touched up with catalytic paint, you need a new microwave oven. If the burned area is limited to the waveguide cover and you can't find a replacement, you can buy a sheet of mica material from a parts house and use the old cover as a template to make a new one. Also, "If you are on Gilligan's Island" and can't get any new material, you can cut the burned spot out and cover the hole on both sides of the waveguide cover with cellophane tape. Do this at your own risk but usually it works fine.......

Nov 04, 2013 | Emerson MW8102SS 1100 Watts Microwave Oven

1 Answer

WHEN I USED MICROWAVE HAD BURNING SMELL & BLACK SOOT APPEARED. STILL HAVE POWER BUT DOESN'T COOK


Just had the same problem. It was an electrical short and the repairman said that it could have burned the kitchen wall and been a catastrophy. Get rid of it immediately!

Mar 02, 2013 | Microwave Ovens

1 Answer

My LG/Dometic MICROWAVE sparks inside the cooking area when turned on


see the next steps and follow with common sense: God bless you
Microwave is arcing If you see arcing or sparking inside a microwave, turn unit off immediately. Arcing can be caused by having something metal in the oven cavity touching a side, an oven shelf is touching the side of the cavity, an oven shelf support has broken, microwave waveguide, or bad magnetron.
If your microwave has a shelf in it, and you do not use it, keep it out. If one of the shelf supports breaks or comes out, the microwave will arc where the support was. You will have to sand the spot down, paint with appliance paint and re-install support. If the shelf shifts on the support and touches the side it will arc.
Your magnetron waveguide will either come out of the top, or side of the oven cavity. Some will have a stirrer in it(mostly top waveguides) with a panel over, or just a cardboard type cover over it. Over time, the stirrer cover can become warped from the heat which will expose the stirrer's metal shaft which will then cause sparking. These covers and stirrers come in a kit and can be replaced from inside the oven cavity.
Your cover over a side waveguide is coated with a substance on it, and overtime this coating can come off from the heat and moisture in the microwave. These waveguide covers are very easy to replace from inside the oven cavity. Touch up any paint that may have chipped or come off because of the arcing.
If your waveguide cover and/or stirrer are all OK, then the spark is coming from your magnetron. The antenna on your magnetrom has overheated and burned, sending the microwaves out at the wrong angle. If you catch this microwave oven repair early enough, you can usually get by with just replacing the magnetron. If the arcing has caused servere damage inside the waveguide, you will need a new microwave. Waveguides are not replaceable and most you can barely see into them, let alone sand and re-paint. In this case of microwave oven repair, when you remove the magnetron, you will see the burned antenna, or your magnetron will fail the test bel
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Jul 26, 2012 | Microwave Ovens

1 Answer

Microwave is arcing and making a popping noise as if something metal was in there while cooking.


I will assume that you do not have any metal items or bits of tinfoil lying around inside the oven.

If the sparks are happening on the inside of the microwave's cooking area while you are cooking, then make sure you clean the inner surfaces really well. Be sure to remove any cooked on food particles that may have splashed up during cooking.

Most likely you have some corrosion or dried food debris inside the cooking area, or perhaps even some food particles stuck to your WAVEGUIDE COVER PLATE. A dirty waveguide cover plate can certainly cause the arcing and sparking you describe.

If the thorough cleaning does not work, you may need to replace the waveguide cover. Here is a link to a short video that shows you exactly how to replace the wave guide cover yourself:

http://www.youtube.com/watch?v=M0xsXjhefy4

Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the video at the website indicated.

If the sparks are coming from somewhere other that the cooking area, then your unit may need more significant electrical repairs or service.

Here is a link to another expert's excellent Microwave Troubleshooting Guide:

http://www.fixya.com/support/r5508031-microwave_oven_basic_troubleshooting

If you choose to rate Heatman 101's tip using the Thumbs Up scale provided, I thank you very much for your time and consideration.
I hope that was helpful to you, good luck and take care.

Joe.

Jun 21, 2011 | Samsung SMH9187ST Microwave Oven

2 Answers

Microwave is 6 months old. clock won't light up. when i try to set cooking time the inside starts making a clicking sound and a light flashes in the top right inside


Sounds like the waveguide cover has been contaminated with food that has carbonised and burning.
Call a Whirlpool repair agent and get the waveguide cover replaced.
They need to be kept clean and leaving the door open after cooking helps to dry the moisture out in the cavity. Making it last longer.

Jan 23, 2011 | Whirlpool MH1170XS Microwave Oven

1 Answer

While cooking in our Whirlpool GH5184 microwave an arcing appeared near the L/H lower corner of the unit. After shutting it off we observed a black arc mark on the inside of the door and a small hole from...


This is caused by either carbon arcing from carbonated food deposits or metal dish or bowl being used inside the machine causing a track. Even a recycled paper towel can cause it as the towels have metal traces in them.

Dec 13, 2010 | Whirlpool GH5184XPQ Microwave Oven

1 Answer

My high power GE Advantium microwave is sparking


Your problem is a common one. When you see arcing inside your microwave, it's because of food or liquid left in the cavity or on the wave-guide cover:

  • If the wave guide has any burn spots, replace it and clean the unit well.

  • If the cavity has any burn spots, spot-sand it smooth and touch it up with microwave interior paint.
Note… If there are any burn holes in the cavity, don't use the unit-seek help from a qualified appliance repair technician.

May 28, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

GE Spacemaker XL1800(JVM1850CF001) - Loud Humming noise


You either have a bad magnetron tube (5 or 10 year parts warranty item through GE Factory Service 1-800-432-2737 or www.geappliances.com) or a shorted high voltage rectifier. I think the light being out is a secondary problem.

Dec 18, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

XL1800 Microwave Problem


A LOUD ticking sound could very well be a High Voltage Arc. This is usually caused by a breakdown of insulation on High Voltage Wires, or components. It can also be arcing between the door frame and the cavity. Usually where the bottom of the cavity floor meets the door frame. Indication of this will be small areas on the door where it looks like the paint has been chipped off, but if you look close you will see it is small burned marks. Another area is the Splatter Shield located inside and at the top. It looks like a Plastic Cover. It is not plastic, but a fiber material. Grease, and food will get trapped on and under this Splatter Shield. Over a period of time the grease and food particles will break down from being cooked over and over again. They will then form Carbon. Which will Arc when Microwaves are present. Remove Push-Pins holding Splatter Shield. Clean by washing with dish detergent . If burned (arc) spots are still present after washing, replace Splatter Shield or arcing will continue. Once Carbon has burned through, it will continue to burn.

Jan 21, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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