Question about Microwave Ovens

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Arching when in use Intense arcing when the microwave is on. Wave-guard has been burnt. Arcing has caused some holes have appeared in the microwave 'gun'

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Quite often this is due to grease or food particles stuck to the inside of the oven or stuck on or behind the waveguide cover.

The waveguide cover is usually about the size of a playing card and often held in place by a plastic rivet.

In some models it is a larger stirrer cover type made of thicker plastic in the ceiling of the oven.

It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!

The cover and the metal behind it should be cleaned with a mild, non-ammonia cleaner.

If the cavity metal of the oven is chipped or charred, it will have to 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.

If your waveguide cover is burned, it will need to be replaced. It provides important protection for the magnetron.

If the magnetron is damaged, it will have to be replaced, too.

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

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.

If your brand and model are not shown, Please reply back with your brand and model number so we can help you.

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

Posted on Sep 25, 2008

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1 Answer

A hole has appeared in the panel of the roof of my Miele microwave oven model H4060BM type MW6004 is this dangerous and can it be repaired?


If the hole is in the wave guide cover, that can be replaced. After removing it, you would need to inspect the inside of the wave guide, and clean it if there is food or grease in it. If any arcing has occurred, damaging the paint, it needs to be repainted.

If the hole is in the metal part of the cavity itself, that can be dangerous, and it's generally impractical to repair.

May 05, 2016 | Miele Microwave Ovens

1 Answer

The unit started arching inside the front panel on the upper left corner.


Arcing Inside the Microwave - Martin Microwave Inc.

microwaveglasstrays.com/shop/articles-arcing.html
Microwave Glass Trays, : Arcing Inside the Microwave - Microwave Glass Trays ...glass tray, microwave plate, glass trays, turntable, microwave oven, carousel, ...microwave energy, and will eventually it will start producing arcs and put out one heck... the damage is non-repairable and the unit should no longer be operated.

Notes on the Troubleshooting and Repair of Microwave Ovens

www.repairfaq.org/REPAIR/F_micfaq3.html
Microwave oven does not respond to START button. First ..... but with the leakage from the spot welded waveguide inside the unit. ... My clue in was a spark between the waveguide and the case, when I was messing with the Controller PCB.) ...

MICROWAVE OVEN ARCING ' MICROWAVE OVENS


Dec 15, 2015 | Microwave Ovens

1 Answer

Why does my microwave arch at the wave guard


Typically most arcing in a microwave is caused by food splatter. A microwave cannot tell the difference between what is on a plate or on the wall or ceiling. Every food particle in a microwave will continue to cook until it turns to carbon and will attract the microwave energy and focus it to that spot and the unit will arc. Thorough cleaning of the entire microwave cooking cavity and removal of any burn or soot mark will commonly stop the arcing. If your microwave has a painted cavity, you can even use some very fine sand paper to remove any burn mark. Always cover what you are warming and really keep the inside of the microwave clean. If your wave guide cover is made out of the Mica board, and If it has gotten wet from cleaning or from splatter, it must be replaced. You can either order a new one or order a sheet of the mica board and cut out a new one yourself. If the microwave is arcing in the waveguide, generally the unit will need to be replaced. One quick test to see if the unit will work is to remove the bad cover and place a small container of water in the unit, run the machine of a minute or so and see if it still arcs. If it does, the arcing is in the waveguide area, if not it may have just been a problem with the cover. You can run the unit without the waveguide cover in place, it is only there to prevent splatter from getting into the waveguide, so removing it to test the unit is ok. If the area inside the wave guide shows signs of soot and arcing. You can try to wipe that out with some alcohol or lacquer thinner and then try it again. Good Luck.

May 15, 2014 | Magic Chef 1.6 Cu Ft Countertop Microwave...

1 Answer

Microwave when turn on making a noise and sparks comin from fan area?


follow this steps and fix it. God bless you

Waveguide Cover




If the microwave is sparking or arcing the waveguide cover might be damaged and shorting out. Try removing the waveguide cover and see if the problem goes away. If there are any damaged spots in the microwave ceiling or sidewalls, repair them and paint them with microwave oven paint. Replace the waveguide cover if it is burnt or if it will not stay in place.

Microwave Oven Paint




If the microwave is sparking or arcing on the side walls the paint might have chipped causing pitting in the metal oven wall. Use microwave safe paint to touch up any bare metal spots.

Rack Support




If the microwave is sparking or arcing near one of the rack supports, remove the support, repaint any bare metal, install a new support.

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Feb 06, 2013 | Turbo Air TMW-1100M Green World 1000 Watt...

1 Answer

Sharp R-980A Convection oven - arcing without any metal (except turntable) and smoking inside.


There is a shorted happening when the magnetron release energy. The problem of that is the waveguide already not in focus (already have a big hole on it) hence it scattered the microwave wave elsewhere inside the unit and also to its own metal casing. That cause's to arcing when operating.
Waveguide hole needed to be replace and it need some cleaning & painting of the affected metal (usually near around the magnetron waveguide). Once it's done the unit will not arcing again.
I do hope I answer your problem. Thanks for asking.

Mar 29, 2011 | Sharp Microwave Ovens

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

I have a GE Microwave Oven/Dual Element Browner Model # JES1288SHO3. The inside cabinet is arching through the wave guide panel. DAVE IN LA.


Hi Dave in LA,

The wave gude cover is replaceable, the part number is1085082. The reason for arcing through is typically a splatter of food stuck to the cover and then the heating waves overcooked or burned it. Carefully replace the cover (panel), look for any burned spots behind the cover, if the wave guide is burned through, the Microwave is unrepairable. If the waveguide has small arc spots you can carefully clean (sandpaper) and use touchup paint to recoat. I hope this helps and if it does, please let us know!

Apr 18, 2010 | Microwave Ovens

1 Answer

Magnetron has 2 small holes in antenna due to previous wave guide being dirty.Is the microwave still safe to use,no sparks or arcing.


Some magnetrons have holes in the antenna by design. If these are clean holes on opposite sides near the RF gasket then they belong there. If the holes are obviously burn damage but don't cause any improper operation, the oven is safe to use.

Apr 10, 2010 | Sharp R-820B Convection/Microwave Oven

2 Answers

Sparks and strange noise when microwave is turned on even when empty inside. i have a ge jvm1850smss over the oven microwave.


YOU SHOULD NOT RUN MICRO WITHOUT ANY THING IN IT / THIS WILL OVER LOAD THE MAG TUBE . AND SOME TIMES FRY IT .. The sparking and arcing is probably a bad wave guide . this is sometimes caused by food splater / it gets in the cracks and corners and then cooks till it truns to carbon which conduts the micro's and thus arching .. clean it good and touch up any burns in the metal and repl wave guide cover. mm hope this will help .. mm

Dec 20, 2009 | GE Spacemaker Over-the-Range Microwave

3 Answers

Arcing inside and there is now a small hole on the panel side. Is this fixable?


Hi,

It looks like there's lightning (arcing) inside my microwave 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.

Thanks for contacting Fixya

Jun 20, 2009 | Microwave Ovens

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