Question about Whirlpool Microwave Ovens

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Crackling noise and possible sparks inside

My mother has mh7130 microwave and tells me it made crackling noise and possible sparks however when i checked could find no problem

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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 stirrer cover in the ceiling of the oven.

The cover and the areas 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 cover is burned, it will need to be replaced. It provides important protection for the magnetron.

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

You can download Whirlpool owner's manuals and installation instructions here. The manual covers removal and cleaning of the cover.

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

Posted on Nov 08, 2008

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Is it normal for a microwave to make crackling noises when standing and not in use but plugged in ?


A microwave in standby mode should not crackle. There might be a slight humming sound from a transformer, but that should be all the noise it makes. You could have a transformer or control panel component that is failing.

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Is it a carousel (turning platter)? if it is, than it is probably dirt on the platter support wheels and the platter support groove/track on the bottom of the oven, clean the glass plate, the support wheels, and the bottom groove as well, if you want to make sure the crackling comes from the carousel system, take it all out (support and platter) than place a glass of water in the oven and start it, if there are no crackling noise than my theory is correct, if the noise is still there than have it checked by a professional technician...

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Hello! Everytime I start my Whirlpool microwave, it makes a loud crackling noise and I'm worried it's going to start sparking. Is there any way to fix this issue, or is it shot?


The cracking spound is the spark jumping. so if there is spark please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is leaking and sparking to the ground. As you have mentioned it was stored, it is quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Now keeping clear switch on , use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.
If there is heating without any issues , you can use the microwave safely

Dec 20, 2010 | Whirlpool Microwave Ovens

1 Answer

My microwave is making a cracking sound like if it had metal in it but i took everything out and its still making the cracking sound. What could be causing this sounds if microwave is empty?


A contaminated wave guide cover will crackle and spark.
They should be periodically checked, cleaned or replaced.
Contact Maytag for replacement parts.
Hope this fixes your noise.

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1 Answer

My microwave oven heats, but makes strange crackling noises. Is it allright to keep using the unit?


No. Please have it checkd as it is dangerous to let the high voltage jump along side the magnetron. This will eventually result in the failure of the magnetron with a possible damage to the circuits.
So open and check if there is any foreign particles/insects struck within , Is the insulation damaged or remove the magnetron and clean the uni , clean the cabin specially if food haas accidently got spurted inside, dry the whole unit after cleaning before you fix back the magnetron.
The microwave must now work without crackling or else if the spark is seem near the magnetron , it must be replaced.
Hope this advice helps.

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Crackling sound in microwave vent when power is off


By "powered off" can I assume you mean that it is plugged in and at idle, not cooking, just showing the clock?

If so, I'd say your control board is failing.

If my assumption is wrong, please write back with more details.

We regularly repair these control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

Feel free to contact me directly (and please remind me of your model number) for more information & help.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

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Could the noise you are hearing be maybe an electical sparking/arcing noise? It could be that the wave guide cover inside the micromave cavity is dirty, and needs to be cleaned. If it is not, then it could be a bad magnetron crackling and going bad. If this is the case, it is likely going to damage the waveguide and render the microwave unrepairable. I wouldn't use it until you have it checked out or take it apart and check it out yourself. Hope this helps.

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