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Frigidare microwave has humming noise when not in use

My Frigidare microwave ...model # FMV152KWA, has a hummimg noise coming from it when door is shut and not turned on. I put cup of water in it and shut the door. The water heated up. Conclusion is humming noise is microwaves working. I assume something wrong with circuit board. Any suggestions. Thanks Dave

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  • Microwave Ovens Master
  • 9,047 Answers

You have a shorted cook relay.

You have a shorted cook relay.

Posted on May 03, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 38 Answers

SOURCE: Microwave Steams Up, Heats Up, and Shuts off!

first of all your mwave needs to be properly ventilated .the problem is your magnetron when heated the thermal cutof switch cutts out power to magnetron.works again when cool.change magnetron

Posted on Mar 20, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: GH7145XFB-1 not heating properly

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose conneciton on the control unit circuit board
- bad magnetron or other high voltage part

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

Posted on Nov 17, 2007

SpotBert
  • 231 Answers

SOURCE: microwave doesn't heat up

There are three solutions (source) =>

http://www.partselect.com/repair.aspx?appliance=microwave&part=no-heat

Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.

Magnetron





A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.

Posted on Dec 31, 2008

sams_trix
  • 93 Answers

SOURCE: GE JVM1850CH06 microwave no heat with loud humming sound

With the details you described, the high voltage diode might be shorted( usually HVR 1X). It is connected from the Capacitor and the chassis, or else the capacitor is the one at fault,but not common .

Posted on Aug 29, 2009

bulldogchief
  • 388 Answers

SOURCE: microwave popped and now does not heat

Okay, first we need to separate the situations. You were boiling water on the stove and had the range hood fan running to **** up the steam. Then you put something in the microwave to heat and you heard a pop and then zip-o.

The water on the stove has nothing to do with the situation, the fan you turn on is not part of the microwave, so it has nothing to do with the microwave.

The pop you heard and then the humming suggests the magnetron failed. You said you found a blow fuse and replaced it and still nothing, right? The magnetron is the most likely culprit...I would think it is safe to say that the magnetron shorted and drew enough current to blow the fuse.

Replace the magnetron and if that doesn't work, let me know here. Good Luck!

Posted on Sep 14, 2009

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My microwave would not turn off. Door closed and light/turntable off, the microwave continues to work when not selected on.


We are very sorry to hear this and we apologize for the inconvenience this has caused you. We would be glad to look into this if you could email us at Whirlpool_Digital@Whirlpool.com with your name, address, phone number and the model & serial numbers of the Microwave.

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FMV152KWA microwave buzzes when not running


Missy Uhland Bauman,

I understand that you are hearing a buzzing noise from your microwave, even though the door is shut and and it is not running. I would suggest to give the appliance a hard reset. You will do this by either unplugging it or cutting the power off at the circuit breaker for 3-5 minutes. After the 3-5 minutes, bring power back. If you are still hearing a buzzing sound, I suggest either contacting the manufacturer or your local authorized technician.

-Best Regards-

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The frame around the door can be gently pryed off and under there you will find the screws you need to remove to replace the handle.

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I have the same problem....I think its the door switch because if you lift up on the door handle while you've got the timer counting down, it should start the microwave hum....

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When door open the microwave should not work at all, if the turntable and light come on with the door open , if they do , then this is an additional problem with door switch and must be fixed.

Regarding humming noise and no heath, Test the high voltage capacitor, the rectifier diode.or the magnetron.

If it additionally does not spin and no light, then check also the door switch.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts. (here in UK).

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If all of your door switches check out, replace the magnatron, capacitor, and diodes.

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Is this a new or used unit, and is the humming sound new? Can you watch the fan blade go around or is it going too fast to watch a blade?

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