Question about Frigidaire FMT118EPB Microwave Oven

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Whenever I try to power it up it pops and blows the fuse

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If the clock etc works after the ceramic fuse is replaced,but when you fire the magnetron to cook,it's more than likely the high-voltage capacitor in the cook circuit,if this isn't it a high voltage diode can be suspect,both of these normally go out after time,if this capacitor shorts from age its normally the culprit,remove the top cover,unplug it of course and short the terminals of the cap to drain any high voltage with an insulated screw driver,then take an ohm-meter and set it on X100 or higher and if it shows zero (0) then it's defective,the diode needs to be checked frt to back on a range X100 and higher,if its the same either way its bad depending on meters parameters,if shorted it will show (0) both ways most of the time or could be leaking and drawing too much current too

Posted on Feb 06, 2010


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Whirlpool Microwave MH6700xW-0 Blows internal fuses regulary

Assuming your power line voltage is okay, it would not surprise me that after 27 years, your high voltage capacitor is drying out and increasing its capacitance. This will cause variance in the high voltage output, which can stress the magnetron and increase current consumption.

You can order Whirlpool parts my model number here.

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Whenever the cooktop lamps blow or when they are removed or installed while the oven has power, the filaments can internally short, causing a surge which can blow the microwave's fuse and damage the circuit board.

I would suggest that you first check and replace the fuse in the oven.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

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.

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GE SCA1001KSS 02 microwave blows fuse.

this is a list of possible causes. Defective interlockswitch or misaligned door, shorted HV capacitor, shorted HV diode, these are top three things that will cause the main fuse to blow when you start the microwave. the humming you hear is from the diode or magnetron. To be safe you have to discharge the HV capacitor here is what you'll need and how to do it. You will need a resistor 100K ohms 25watts or a a string of smaller ones to add up to that. Solder one end of the resistor to a well insulated clip lead of 2 to 3 ft. long.Solder the other end toa well insulated contact point as a #14bare copper wire about 2 inches long and secure the resistor to a piece of 2ft pvc pipe with electrical tape clip the other end of the clip lead ground to a unpainted spot on the chassis of the microwave and use the pvc pipe as a handle and touch each side of the capacitor to discharge a couple seconds at a time switching back and forth. after a minute or so take a well insulated screwdriver and touch each side of the capacitor at the same time and if you have no arcing, popping and such it is safe to take off and replace

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Microwave Blowing Fuse. Fixed. After Day, Fuse Blows Again.

Hello there:
If you have all ready changed out the fuse and it has happned again i would first check to see that the fuse is the right one for the machine (i am sure that you did this but please recheck ) next i would look at the controle board as the next culprit it maay be failing expecially if there were any pops ar sparks that was noticed before the initial failure.
Also check to see if all of the wires by the board a re not loose or looked burned ar if there is any grease or anything like this around the area
And finally check to see if the plate is turning ok and not sticking cause this would cause the microwave to overload and it wil make every fuse you put in there fail after just a couple of uses ok
SO please try all of these things that i have explained to you
I hope this is very helpful for you.
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No Power to Microwave, nothing works...

I had a Sears microwave once that about once a year a fuse inside would blow causing no power to get to microwave. I removd the housing and saw a tubular fuse which resembles a older automotive fuse,
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Dec 29, 2008 | Roper MHE14XKB Microwave Oven

1 Answer


The Interlock Monitor Switch is an added
safety check on the Primary and
Secondary Interlock Switches. If the
Primary and Secondary Interlock Switches
allow the oven to operate with the door
open, the Monitor Switch will blow the

You can get more information about adjuting the interlock switch from this link

sections 7-11 thru 7-12 discuss the door interlock adjustment that will cause the 20A fuse to blow if it isn't set up right. I hope this helps you...

Aug 03, 2008 | LG LMVM1935 Convection/Microwave Oven

1 Answer


after blowing the fuse?..what happened next?...did you replaced the fuse and it start running again or if you replaced the fuse, it will blow again?

if it is always blowing the fuse, you may have a shorted diode in between the high voltage capacitor. you could remove that just to test if the fuse would no longer blow and if it would heat.

if it did not blow anymore and it did heat the ffod or water, then you all need to raplace that diode between the high voltage capacitor.

if the fuse did not blow anymore and it is still not heating the food , then you might have a faulty magnetron.

if it still blow your fuse then you could have a shorted magnetron, a shorted diode which is the one from the capacitor to the ground( this is anothere diode besides the one installed between the terminals of the high voltage capacitor) ( don't interchange them, they have different puposes..) or shorted capacitor also.

use a regular ohmeter to test each part...

i hope you can solve your problem with these instructions....

good luck,


Aug 02, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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