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Frigidare Microwave humming when not being used

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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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 5 Answers

SOURCE: Everything works...Except for actually heating the food

It has a bad magnetron. This is the tube that provides the microwaves to heat the food. Not too easy to replace yourself but it can be done. Cost of magnetron is probably less than $50 or $60.

Posted on Dec 14, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave is not working

Yes. This is usually caused by either a bad door switch, a loose door switch mount, or occasionally a misaligned door hinge.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

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

There may also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

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

Posted on Aug 08, 2008

  • 38 Answers

SOURCE: My Frigidaire over the stove microwave not heating food

Hi,It is most likely the magnetron and diode that has to be replaced. This job should be done by a tech, High voltage. Magnetron's normally have a five year warranty, check your owners manual.

Posted on Mar 20, 2009

  • 159 Answers

SOURCE: how can u tell which switch is bad on the frigidare microwave

the door switches almost never break it sounds more like no power check the fuses on the pc bords

Posted on May 15, 2009

localwonder
  • 6784 Answers

SOURCE: microwave not heating

OK, you have two components that are faulty. the magnetron and the turntable motor as well. replacing these two components will fix both issues.

Posted on Jun 10, 2009

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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.

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You have a shorted cook relay.

You have a shorted cook relay.

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Chances are that the secondary (cook) relay on the control circuit board is shorted, meaning that the oven is actually cooking any time the door is closed.

You can test that by putting in a cup of water, shutting the door, and letting it go for about 30 seconds, then checking the water temperature.

This is dangerous, and can lead to a fire, so please unplug the oven until it is repaired.

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Went to turn on the mic and heard a pop and now no power. think i blew a fuse. changed it and same thing all over again. any ideas???


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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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