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Our microwave oven suddently gives very little power and you can hear arching noise from inside.

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This is a fault in the high voltage supply, or with the tube itelf. You should take it in for service.

If you are not experienced and set up for microwave oven service, do not try to fix this yourself.

Jerry G.

Posted on May 16, 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

GE Spacemaker SL 1800 arching


Get some warm soapy water and clean inside making sure there are no food particals, if no change! the magnetron may be breaking down.

Mar 13, 2012 | GE Spacemaker JVM1640SJ 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

My microwave is making a loud buzzing noise and there was some charred areas inside on side wall


The loud noise is probably the magnetron makign the noise. The charred areas on the wall are from possible grease or food particles arching and burning the cavity. Alot of times there is a cover on the wall it burns. it would need to be replaced, as well as sand and paint the cavity area that is damaged with m/w grade paint.

Nov 21, 2009 | Thermador MBBS 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

My oven started arching with micowave popcorn (4 or 5 different times). Now it will not heat. No error messages on the screen and everything else works. Thanks Dennis M.


Hi, there are three issues that will cause a no heat situation in a microwave. these issue are a failed Magnetron, busted cut-off fuse and, failed diode.

I recommend checking all these area that are located inside the microwave for faults.

The most common issue will be a failed Magnetron.

The diode and, fuse will be located on the noise filter assembly.

Jun 21, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Maytag MMV4205BA microwave buzz/grind when operating then no power


you may have some arching inside where your magnatron is located.If you open the door on the right middle part there is a silverplate on the wall .If it is burned you may need to replace magnatron.if you do not seee burn marks it may still be the magnatron hope.that would be the only possible thing that would make the noise other then the mtor plate out of place.

May 15, 2009 | Maytag MMV4205 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

1 Answer

Microwave stops


power supply have tech look at your microwavegood luck.

Apr 22, 2007 | GE JES1288SH Convection/Microwave Oven

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