Question about Amana RFS12MPS Microwave Oven

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There is a loud buzzing sound and it trips the breaker after 10 seconds of operation. What is the problem?

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Typically a bad magnetron. They draw a lot of power when they go bad and trip the breakers or fuses inside the micro. Very fixable

Posted on Jul 18, 2013

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1 Answer

Makes a really loud buzzing noise during operation


Unit uses a Magnetron and likely a power board called an inverter to run it. Someone would have to open the unit in a way where they might pinpoint where the sound is coming from and then take action--does not of course sound normal or good to me.

Dec 10, 2012 | Samsung SMH1622W

1 Answer

GE Spacemaker XL 1800 Microwave. After removing heated food, I closed the door and the microwave sounded like it was powering up again. However, no internal light came on as it does when the unit is...


Be sure to keep this oven unplugged or the door open until it is fixed. If it runs by itself, this is a fire hazard.

First listen carefully for a buzzing sound behind the control panel when the door is shut.

If it's present, chances are you have a failing capacitor on the control panel assembly, which can be repaired for $39.95 in most cases. Details are here.

If that or a louder buzzing is only present when you have the door closed, then the oven is cooking when it's not supposed to, but the cooling fan is not on, and it is overheating and tripping the breaker.

That would be due to a shorted cook relay on the control board. That can also be repaired with our $39.95 service.

The odd characters on the display concern me separately. This could mean you have a noisy or otherwise failing magnetron.

If the display is fine when you're cooking properly with it, then the magnetron is probably okay.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

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

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Apr 28, 2011 | Microwave Ovens

1 Answer

Runs for 20 seconds and trips breaker. making a loud noise when running


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Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

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heatman101

Sep 07, 2010 | Maytag MMV4205 Microwave Oven

1 Answer

Unit not getting power


These machines seem prone to having a bad magnetron. Look for a circuit breaker near the power cord entry point. If tripped, reset and try to heat a cup of water. If it makes a loud buzz and then pops the breaker again, the consensus view is a bad magnetron. This is one repair that is recommended to send out. (~$150). You need to evaluate the probable cost vs a new machine.

Apr 13, 2009 | Whirlpool MH7155XM Microwave Oven

1 Answer

Makes a loud buzzing noise and does not get hot


Have seen this many times.

Sounds like a bad CAP since a bad diode would blow the fuse and a bad mag would likely do the same thing.

Since yours is making the loud 60hz buzz you need to replace the capacator that will likely fix the problem. A $10 fix

Jan 06, 2009 | Kenmore 62622 Microwave Oven

1 Answer

Microwave made loud popping noise


The magnetron is bad. Probably cost about $50 or $60 for the part. Not too easy to replace, but it can be done.

Dec 13, 2007 | Whirlpool MH7130XE Microwave Oven

1 Answer

No Power at all after loud short buzzing sound


sounds Like an electrical fault in the Micro, Sorry but this is broken.... If this is within warranty (do check as some warrantys are for 3 yrs or more) get the manufacturer to replace/repair it for free. you could get it serviced, but it is probably cheaper to buy a new one.

Aug 24, 2007 | Sharp R-1460 Microwave Oven

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