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Microwave making crackling noises whilst not in use

Oven maiking crackling noises whilst not in use

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 Answers

SOURCE: GE JVM1650SH Stainless Steel 1000 Watts Microwave Oven?

It sounds like you may have had an issue with a high voltage part such as the magnetron, diode, or transformer. It's also possible that you had an arcing stirrer. I would also check to see if your model is covered by / affected by this bulletin: http://microwavedisplay.com/ge_mw_mag_kit_bulletin.pdf If you or a friend decide to work on it, we have *critical* safety & disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your full model number (without the suffix) here: http://tinyurl.com/gv383

Posted on Apr 29, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: GE over the range microwave making grinding noise

This sounds like the stirrer. If it sticks or stops, the microwaves can damage or destroy it. You may have a bad stirrer or magnetron. There is an important bulletin that covers these problems. To see if yours is covered, see: http://207.234.249.73/mwd/ge_mw_mag_kit_bulletin.pdf If you need more help, please follow-up.

Posted on May 01, 2007

  • 4090 Answers

SOURCE: ge spacemaker microwave JVM1330BW002 making noise, food not warm

bad news I am afraid. the heart of the unit has had a coronary and needs a tech to intervene

Posted on Aug 01, 2009

  • 66 Answers

SOURCE: after a few seconds my microwave makes a crackling

check for scraps of foil, wire ties any type of metal or tin,or aluminumif not any of that, ur looking at a componet problem

Posted on May 23, 2010

  • 30 Answers

SOURCE: model 721.64282 microwave/convection oven -

No heat but otherwise normal operationA shorted HV diode, magnetron, or certain parts of the HV wiring would probably result in a loud hum from the HV transformer but will likely not blow the main fuse. (However, the HV fuse - not present on most domestic ovens - might blow.)
If the main power fuse is located in the primary of the high voltage transformer rather then at the line input, the clock and touchpad will work but the fuse will blow upon initiating a cook cycle. Or, if the fuse has already blown there will simply be no heating action once the cook cycle is started. There are other variations depending on whether the cooling fan, oven light, and so forth are located down stream of the fuse.

Some models may have a separate high voltage fuse. If this is blown, there will be no heating but no other symptoms. However, high voltage fuses are somewhat rare on domestic ovens.

A number of failures can result in the fuse NOT blowing but still no heat:


  • Bad connections - these may be almost anywhere in the microwave generator or the primary circuit of the HV transformer. A common location is at the crimp connections to the magnetron filament as they are high current and can overheat and result in no or intermittent contact. See the section: See the section: Testing the magnetron.
  • Open thermal protector - usually located on magnetron case. Test for continuity. It should read as a dead short - near zero ohms. See the section: Testing thermal protectors and thermal fuses.
  • Open thermal fuse - some ovens have one of these in the primary circuit. It may be in either connection to the HV transformer or elsewhere. Test for continuity. It should read as a dead short - near zero ohms.
  • Open HV capacitor - see the section: Testing the high voltage capacitor. A shorted HV capacitor would likely immediately blow the fuse.
  • Open HV diode - see the section: Testing the high voltage diode.
  • Open magnetron filament - This failure may also be due to loose, burnt, or deteriorated press (Fast-on) lugs for the filament connections and not an actual magnetron problem. See the section: Testing the magnetron.
  • Open winding in HV transformer. See the section: Testing the high voltage transformer.
  • Defective HV relay. A few models use a relay in the actual high voltage circuitry (rather than the primary) to regulate cooking power. This may have dirty or burnt contacts, a defective coil, or bad connections
  • Shorted HV diode - see the section: Testing the high voltage diode.
  • Short or other fault in the magnetron - see the section: Testing the magnetron.
  • Short in certain portions of the HV wiring. See the section: Testing and repairing the wiring and connections.

Depending on design, a number of other component failures could result in no heat as well including a defective relay or triac, interlock switch(s), and controller.


If you are interested in doing it yourself the following link will help : Microwave Repair Manual

(**All the above references to tests are found here)

Posted on Oct 22, 2010

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They should be periodically checked, cleaned or replaced.
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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 noise and possible sparks inside


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.

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