Question about Frigidaire FMT118EPB Microwave Oven

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I changed the fuse on a Frigidare #FMT118EPB Microwave and it blew again. I checked the micro switches with a meter and they seem to work. What else could be causing the fuse to blow? Thanks.

I checked the micro switches with a meter and they appear to be fine. I changed the fuse.

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If you put in the correct size of fuse then what it needs is to go to a qualified service tech. What would be next requires removing the covers and if you do not know what you are doing you will fry yourself.

Posted on Dec 06, 2014

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1 Answer

How do I determine if the fuse is bad on a Frigidare #FMT118EPB Microwave? Thanks.


Michael, if the fuse is bad, it will take out everything on the microwave. You will not have any lights inside or on your display. You can find the fuse inside of the cover by following where your power cord goes into the unit and following usually the black wire to the fuse. Hope this helps!

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Be-safe, Un-plug your microwave oven ,

Open the microwave cover ,
Close and open door few times to check the door latch(es) and switch(es).
Door switch assembly may has one or more micro switches.( Most switches are black or grey and about 1,25 in long X 3/4 in wide X 5/6 in thick with two or three wire connections).
Making sure door latch close and open these micro-switches.

You can hear the switch "clicks" when small switch pin or lever is pressed.

Sometime these door micro-switches pin or lever get stuck or broken.

You can take couple pictures before remove wires or micro switches

You can buy these switches for about 3-7 dollars online. Some web sites have video showing how to check them. (Using Volt-Ohm meter)

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Inside behind the display panel on a small circuit board.

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Could be a blown fuse in the HV transformer primary circuit,bad connections to the magnetron filament,open thermal protector or thermal fuse,

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Sunbeam SMW5500 micro/convection oven shorted out when opening door


You are decribing a typical Door Safety Switch problem. The Door Safety Switches has Failed.The Door Safety Switch is designed to shut down the Micro in the event the Micro is still cooking when the door is being opened. The first "Click" of the switch cuts off the "Cook". If it does not cut off the "Cook", the second "Click" blows the power. Otherwise it would "Cook" with the door open, and I need not to tell you how DANGEROUS that could be. It first Tripped the Circuit Breaker which supplies power to the Microwave. After Re-Setting the Breaker the same thing happened except this time the Micro is DEAD- not even a light working. Yes, there is a line FUSE inside the Micro. You however need to address the Door Switch SHORT before replacing the fuse. If not, it will just Blow The Fuse Again, and Again, until the Short is corrected.
Call around, ask How much to replace a Door Safety Switch.
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My amana micro just went dead. No lights nothing ,almost like a fuse blew.Its an over the stove model . The outlet works fine.#mvh210w

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Microwave over the stove


If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

It may also be a problem with a door switch or door switch mount.

If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
Please write back with more details if you need further help.

We're happy to help and we appreciate your thoughtful rating of our answer.

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The door latch switches, and monitor switch assembly needs adjusting. With the door open the two latch switches should be normally open,and the monitor switch closed. Opposite way when door is closed. MAKE sure oven is unplugged before testing

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It's possible that it is a sign or trouble, but it will make seemingly odd noises when it is switched on and off. For the most part, you can wait until you see more definitive evidence of trouble. Watchful waiting is probably in order here for the next week or so.

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