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Old 05-13-2019, 07:28 AM   #16
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Re: Microwave Sparks


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Replace your waveguide. Itís bad. Donít use your microwave until you do. You can ruin your magnetron
I'm not an appliance expert, so I'm still new to the jargon. When you save "waveguide," are you referring to the mica cover that I wiped off with a dish rag? (I understood that piece of mica as the waveguide cover, so that's where my confusion lies)
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Old 05-13-2019, 12:21 PM   #17
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Re: Microwave Sparks


Yes


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Old 05-14-2019, 05:56 PM   #18
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Re: Microwave Sparks


Is the "paint" wearing off anywhere in there? This can cause sparks too.
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Old 05-15-2019, 02:12 AM   #19
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Re: Microwave Sparks


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I have a GE Profile Advantium 120 microwave in my home. It's well taken care of, so I wouldn't expect our newest problem to be a result of neglect or abuse. However, it started sparking recently while in use. It's intermittent. Someone will probably say, "you had metal in there." Nope. The item I heated last night was a plastic bottle full of water, and I had done this a thousand times in the past, same bottle, with no issues. What are some tips folks can share about what might be causing the issue?

Thanks in advance!
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I put metal dishes in mine all the time. never had a problem.
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Old 06-04-2019, 08:17 AM   #20
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Re: Microwave Sparks


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Is the "paint" wearing off anywhere in there? This can cause sparks too.
Hopefully you noticed my pictures earlier in the thread showing a complete stainless steel interior; i.e., no paint. Otherwise, yes I would be looking for chipped paint.

UPDATE: A couple weeks ago, I ran to the local appliance parts store and bought a new piece of mica. I trimmed it to size and installed it. It seems to have made a positive impact, but oddly enough, I don't think the issue is completely resolved. The occurrences of sparking has dropped dramatically. However, since the repair a couple weeks ago, my wife and I have "heard" the sparking from afar a couple times. We quickly run over to the microwave, only to find that it won't act up again. Most folks don't stand and stare into their microwave glass while it operates, so we've not been fortunate to "see" the sparking since the mica repair. About once a week, she heats one particular dish with pieces of baking chocolate to melt. This particular scenario does seem more prone to "hearing" sparks. The dish is completely ceramic though and was perfectly fine up until a month ago, when this all started. I don't know if there's something special about this dish or the chocolate that might aggravate this issue though. Maybe its shape is exacerbating the underlying root issue; I don't know though. So I asked her to try using a different dish next time. And a couple times, I've heated 4oz water in a small plastic cup that I've "heard" sparks from while standing somewhere nearby; again this has been done hundreds of times in the past, problem free. It all seems bizarre to me. I'm clueless. Anybody else have thoughts about it?
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Old 06-04-2019, 12:23 PM   #21
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Re: Microwave Sparks


Theoretically you shouldnít have any. We get them in ours when we heat up vegetables for our bird. I donít add water which is why I believe it does it. She adds water and no issues. You shouldnít have any sparks with a glass of water. You may have to disconnect the power. Look at magnetron and see if there is any food or burnt items on it or near it. Make sure there is no area inside the cabinet that it could arc too. Like if it has a shelf but some food has been spilled and gotten behind clips. Other then changing the board and cleaning it well thatís all I can offer. I donít know offhand what brand yours is but if it has a stirrer make sure itís working. That would require cabinet removal to check it. Some have them, some donít. You could look at an exploded view to check and see if you have one without taking it apart


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Old 06-04-2019, 12:34 PM   #22
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Re: Microwave Sparks


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Look at magnetron and see if there is any food or burnt items on it or near it.
Where is the magnetron? Isn't that behind the mica wave guide cover? If so, I imagine it would be clean since it's covered. Is that correct? I think I recall looking at it when I replaced the wave guide cover, and don't recall seeing any debris on it.

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Make sure there is no area inside the cabinet that it could arc too.
I think I'm going to take it apart and do a deep clean on it. There is food grime behind some of the vent perforations inside. Maybe that is part of the problem.
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Old 06-04-2019, 04:28 PM   #23
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Re: Microwave Sparks


Yes itís right behind the plate. If you see food debris you need to get rid of it. Thatís probably what itís arcing to


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Old 06-09-2019, 07:41 AM   #24
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Re: Microwave Sparks


UPDATE: Today, my wife heated the chocolate again. This time, she used a different bowl. Lo and behold, no sparks (or sounds of them). So I told her to revert back to the original bowl next time. I'll see what happens then.

The other ironic aspect about the original bowl, is that it's often used to heat many other things. It never seems to give issues though, except when she's trying to heat the chocolate. Very weird.
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Old 06-09-2019, 06:28 PM   #25
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Re: Microwave Sparks


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UPDATE: Today, my wife heated the chocolate again. This time, she used a different bowl. Lo and behold, no sparks (or sounds of them). So I told her to revert back to the original bowl next time. I'll see what happens then.

The other ironic aspect about the original bowl, is that it's often used to heat many other things. It never seems to give issues though, except when she's trying to heat the chocolate. Very weird.
if the bowl has small metallic objects in it or in the glaze (e.g. iron filings, metallic paint), they can act as tiny antennas and cause strange behavior.
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