Question about Microwave Ovens

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When I turn the microwave on it runs fine for first few seconds the. It starts sparking from that plate with the burn mark. What is going on?

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  • Microwave Ovens Master
  • 1,669 Answers

I'm sorry to say, your unit is shot! Once the control of the microwave signal is deflected like that, it is DANGEROUS to operate. It may not be worth fixing. Replace it!

Posted on Jan 20, 2013

6 Suggested Answers

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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave quit

I would suspect either door switches or an intermittent control circuit board, either of which can be repaired. Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure over time. I have a text file on my site called "doorsw.txt" which helps in diagnosing and repairing door switch problems. You can find the file via a Google search. It will help you check and replace the door switches if you or an able friend is so inclined. In some cases, the problem is a bad connection or a bad relay on the control board. That's something we see fairly often, and we repair them for only $32.50 nationwide.

Posted on Oct 12, 2006

MicrowaveSvc
  • 9047 Answers

SOURCE: Jenn-Air Microwave M169B 11 years old.

You should be able to get a replacement keypad, and that's not a hard job for a DIYer.

If you're interested, post your correct brand and model and I'll give you a more specific suggestion.

(Your post subject says Jenn-Air M169B put it's posted under Sharp R-316FS so I'm not sure which you have).

If it's a Jenn-Air, you can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

You can usually find Sharp exploded views by entering your FULL model number here: http://www3.sears.com (the 3 is correct)

You can order Sharp parts from there or from Tritronics at http://www.wehaveparts.com

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

Posted on Jan 21, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: microwave turns off after 10-15 seconds.

If it stops at 16 seconds and is a sensor model, it probably has a defective humidity sensor.

Ifit stops after 22 seconds, that means the controller has detected aproblem, usually a problem with the inverter or a bad magnetron.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

You can find an authorized Panasonic servicer here.

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

Posted on Nov 21, 2008

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  • 4088 Answers

SOURCE: The microwave starts, then stops after a few seconds, and smells

Remove the cover after pulling the power plug. Check the transformer and large capacitor for signs of overheating. If they look ok, then remove the sheet metal wave-guide from the area where the energy enters the cooking cavity. Under the wave guide is a fan-like device called a stirrer that has a plastic bearing. This stirrer bearing is commonly arced over (when the oven is operated with nothing to heat in it). Usually the bearing looks good, but has arced internally. Replace the stirrer as a unit. The machine can be operated with the case off and a cup of water for a load, but keep you hands clear. Look for smoke.

Posted on Sep 07, 2009

MicrowaveSvc
  • 9047 Answers

SOURCE: we have a ge microwave. Sparks came out of

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

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

Sometimes it is the ceiling of the oven.

Your owner's manual may address this. You can download GE owner's manuals and installation instructions here.

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.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart or Lowe's.

If your waveguide cover is burned, it will need to be replaced.

You can 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.AC

Posted on Oct 11, 2009

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1 Answer

Had a power surge, microwave started to smoke. Reset power in the house and microwave works fine. 1) Is there anything I should be concerned about? 2) If I continue to use it, can it catch on fire?


Microwave ovens have a lot of safety devices built in. Not sure why or where it was smoking from but without removing the cabinet and having a visual look for something burnt, it would be impossible to say. If the machine is now working OK, ??? who knows. All I can say is that for the next few future uses of the machine, I wouldn't leave it unattended in case there is something that has failed. Chances of fire in a microwave is possible but this is usually something that you are cooking that catches fire, not the machine itself. I have seen the mica cover plate burn in the cooking compartment. It may be that ? Its a small squarish plate that is usually on the side of the oven compartment. It stops food etc and splatters from going into whats known as the waveguide tunnel (The part where the microwaves come out) On some machines, this cover may be plastic. Have a close look inside the oven compartment for a cover that has burn marks or discoloration.

Apr 13, 2015 | In 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...

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I have a Sylvania Microwave oven Model # SM81004/SM81001 1.0 cu.ft. It started sparking during reheating a plate of food only after about 1 Minute. The metal plate on the right side looks like it has a...


You should replace the waveguide cover, the plate you refer to. They are fairly cheap and easy to replace.
www.espares.co.uk or www.cpc.co.uk most appliance repair services can get them.

Mar 08, 2011 | Sharp R-820B Convection/Microwave Oven

1 Answer

R-1214 Stainless Steel 1100 Watts Microwave Oven: turns on buts starts sparking in a few seconds. ...


what's sparking... is it by the Magnatron window... or the carousel?...
If there is a carousel... take it out...
if its by the magnatron window,,, then...houston... we have a problem...
might be contamination... and that may require opening up the unit... sorry...
hopefully it's only something floating around in there that's causing the arc...

May 06, 2010 | Sharp R-1214 Microwave Oven

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Panasonic NN-T994SF Microwave Oven quits after 15 seconds


my microwave shuts off after a few seconds. is there a fuse that needs replacing?

Feb 01, 2010 | Panasonic NN-T994SF Microwave Oven

1 Answer

When using on small amounts of food would burn (spark & flame)


Sparks in microwaves are caused by metal things in there. What kind of plate - any metal or gold leaf decoration on it?
Try a microwave safe dish.
Make sure you do not use metal items in microwaves.
I do not know the model number of your nuker, is it a new one or old? How long have you had it, and has it always done this?

Apr 26, 2009 | GE Microwave Ovens

1 Answer

GE microwave won't turn off


Just checked the GE website. Had the same problem with my 5 year old microwave. GE website says to close and open the door quickly three times. First time I did this it didn't work. Second time I closed the door with some significant force and reopened it more quickly. Worked. Unplugged the microwave, plugged it back in, still fine.

Mar 21, 2009 | Microwave Ovens

1 Answer

The silver cover got a burn spot on it


Because the silver piece had a burn hole in it and the opening that it covered also had a burn mark, I bought a new one.

Oct 07, 2008 | Emerson MW8102SS 1100 Watts Microwave Oven

1 Answer

Whirlpool Microwave


The magnetron has failed and has damaged the waveguide. This type of failure is generally unrepairable. First look in your owners manual for specific warranties, then contact Whirlpool and explain to them what has happened.

If you need further assistance, let me know
Regards,
reg501

Jul 07, 2008 | Whirlpool GT4175S Microwave Oven

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