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How do i change a fuse on Model FMV157GS microwave?

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SOURCE: Firgidaire Microwave fan runs when door is closed.

I'd bet the fan and / or turntable also run when the door is closed, which means you have a shorted relay on the control board, which can be repaired for $39.95 in most cases. Details are here.

Posted on Apr 29, 2011

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Frig.Model FMV157GS: When door is closed it is heating without lite on or turntable rotating. If time is entered with the door open it then heats as normal when the door is closed. Thanks, Jim

Good Morning Jim Cole, thank you for your post!

From what you are describing it sounds like it could be an issue within your control panel or door switch. I would recommend having a technician out to properly diagnose your Frigidaire microwave to avoid any unnecessary part purchases. I hope this is helpful. -Matt

Sep 24, 2014 | Microwave Ovens

1 Answer

Where is the high voltage capacitor at on panasonic microwave model nn-sn960s

behind the control panel,while your checking the h.v. cap check the h.v. diode for a shorted condition as this will also blow the 20 amp fuse too

Jan 06, 2013 | Panasonic NN-H275 Microwave Oven

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My magic chef microwave, model # iMCO160S,lost power, not during use. I have checked electrical connection and is OK. Do i need to change a Fuse ?

Fuses are a common failure part. If the fuse, you can purchase ceramic types from Electronix:

Sep 03, 2011 | Magic Chef MCD1311ST Microwave Oven

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Firgidaire Microwave fan runs when door is closed. Model FMV157GS

I'd bet the fan and / or turntable also run when the door is closed, which means you have a shorted relay on the control board, which can be repaired for $39.95 in most cases. Details are here.

Apr 28, 2011 | Frigidaire Microwave Ovens

1 Answer

Microwave makes a loud humming sound when turned on.

Microwave ovens have a diode stack, usually made up of HV Diodes sometimes only 1, if there is 2 one will sit between the 2 connections on the hIgh Voltage Capacitor which sits at the back usually right hand side to the right of the transformer, WARNING: before doing anything, the Oven must be unplugged and the capacitor shorted to earth, unplug one side of the diode and using a multimeter check for short, it should read virtually open circuit, if there is a problem with it it will show a low reading regardless of the polarity of the probes, there is another diode that sits between the HV Capacitor and the oven case (earth) do the same with that, if either read low, replace, then using the multimeter and test between the two connections of the HV capacitor, if reading id low, replace, then check the connections on the Magnatron to earth, not to each other, read should be open circuit any reading, it needs tro be replaced. Hope that helps...Phil

May 19, 2009 | KitchenAid Microwave Ovens

1 Answer

Microwave Repair

there are several internal fuses protecting different circuits, as long as you get a direct replacement you will be ok

Feb 18, 2009 | Whirlpool GH4155XP Microwave Oven

1 Answer

Microwave Repair

You will need a model # to look up parts. Go to and you can see a diagram. Use the model # on the sticker in the microwave. There will be a fuse and most of the time they are easy to get to.

Oct 08, 2007 | Microwave Ovens

1 Answer

Emerson Model MW8627W does not heat after changing fuse!

check the magnitron and capacitors one of this is bad

Sep 18, 2007 | Emerson MW8627W Microwave Oven

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