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Arching when in use - Microwave Ovens

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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.

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

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

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.

Please write back with your brand and model number if you need further help.

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

Posted on Jun 29, 2008

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What to do when the microwave is arching.


Hi.
If your microwave cavity is crossed by luminous discharges of current , and you see flashing arches of current from the magnetron area to other areas of the microwave oven cavity, then we commonly say that the microwave is arching.

The first thing to do in this case is disconnecting power immediately, and trying to remove the cause of arching if possible.


Arching will damage the microwave oven, if it goes on for enough time.
Any metal conductive object, such as a spoon or a fork will cause arching if left inside the oven when the microwave device (the magnetron) is operating.
Ensure that there is no metal object inside, while the appliance is operating.
Some vegetable with an high amount of metal , and some other ingredient, like bacon , are known to cause arching in sporadic cases.
In that case add a little water to the food in the oven and try again.

Sometimes recycled paper, or use of containers that are not for microwave can also cause arching. In that case use a different container, or paper.
If there is arching and bad burnt-plastic-like smell with any food being cooked, that means that there is a major problem, and that if the oven is used in this condition, you may get further damage to the appliance. In some case there may also be safety concerns.

As said, you get arching inside microwave when inside the cavity there is a strongly conductive object, such as a metal object or carbon residue.
You also get arching when the oven cavity is damaged.
In this last case the cavity may have lost insulation, and it is better having the oven repaired by a technician, that will also conduct a radiation leak test on the appliance to prove its safety.


To attempt fixing the problem by yourself , you can do the following:

Disconnect power cord.

Check inside the oven cavity, ensure that there is no foreign object inside (such as a small screw). Check also under the turntable.

Check that the light and the magnetron covers are well in place.

Clean the cavity thoroughly, clean also the lamp enclosure if this can be accessed. Carbon residue from food may be causing the arching.


If after cleaning the arching is still there, that means that the cavity is damaged. In that case better calling a technician.
A damaged microwave may loose insulation , and this may be very dangerous for health.

If you want to contact a technician, the best thing to do is ringing the phone number listed on the appliance owners manual.




Ginko.

on Feb 06, 2010 | Microwave Ovens

1 Answer

Its arching and humming


Once a microwave starts arching it is a real problem. They are coated with a special paint and if the paint gets scratched then arching gets worse and it can burn out the whole oven. See this page: http://www.microtechfactoryservice.com/

Feb 26, 2013 | Emerson Microwave Ovens

1 Answer

I'm experiencing occasional arching from the center of the oven i.e. out of the spindle that rotates the metal rack and glass turntable. I cleaned thoroughly and it seems to have minimized the proble


Its unlikely to be associated with the tuntable motor. Units are tuned to prevent arching. Therefore it appears something may have changed inside the unit. Be sure there are no loose items or bits of foil or other mateallic items inside. Also check metal turntable.

Dec 31, 2011 | GE Advantium 120 Convection/Microwave Oven

1 Answer

Electrical arching between top metal plate and shell?


i would imagine its a shield but iam not completely sure without a good look

Nov 20, 2011 | GE XL1800 1100 Watts Microwave Oven

1 Answer

Started arching


This can be caused by grease in the oven especially on the paper like filter inside most of them. If it has burnt spots it may need to be replaced.

Aug 30, 2009 | Emerson MW8102SS 1100 Watts Microwave Oven

1 Answer

Arcing


My Advantium was arching at the turntable. Replaced the turntable roller assembely (that hold the metal or glass plate) and the arching went away.

Nov 16, 2008 | GE Advantium 120 Convection/Microwave Oven

1 Answer

Arching inside microwave


un plug it right away.

there are carbon deposit near the wave cover. the arching is coming from the magnetron to any exposed metal inside the unit or any carbon deposit since carbon is already conductive, it is sensing it as a metal.

remove and clean the interior of the microwave. polished and paint all exposed metal that you will find in the interior.

then test again the unit.

tnx 4 using fixya,

drcool

Sep 30, 2008 | Whirlpool GH7145XF Microwave Oven

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