Question about LG Microwave Ovens

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My LG Microwave LMV2015st is blowing fuse,Why?

When the door is closed and i push the start button about 2 sec the fuse blows

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  • Expert
  • 168 Answers

Possibly the diode is shorting. replace the diode before replacing the fuse

Posted on Jun 07, 2014

6 Suggested Answers

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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave blows fuse

The most common suspects are the high voltage transformer and the magnetron. It's also possible you have a flaky door switch or loose door switch mount. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383

Posted on Jun 08, 2007

fridgetech
  • 473 Answers

SOURCE: Microwave keeps blowing fuse

If it blows the fuse as soon as you hit the START button, it's almost certainly a shorted high-voltage capacitor.

If it blows a few seconds after you hit the START button, it's probably the high-voltage transformer. You'll possibly also smell a faint electrical burning smell from the rear vent after you shut if off.

If it blows the fuse as soon as it's plugged in, you probably have a shorted door switch, a shorted varistor, or an internally exposed wire shorting to the chassis, etc.

Posted on Nov 19, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: Sharp R-510AK Microwave Oven Fuse Blows

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.

Here are some links you or a friend can use for test help, but read their safety warnings first:

http://www.microtechfactoryservice.com/cap_test.html
http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html


You can probably find an exploded view by entering your FULL model number here: http://www3.sears.com (the 3 is correct)
You can order Sharp parts from Sears or from Tritronics at http://www.wehaveparts.com
We\'re happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jan 13, 2008

AlmostBob
  • 550 Answers

SOURCE: fuse keeps blowing.

couple questions -
what else is on the circuit,
and what current does the oven need

there are whirlpool over-range models with
1200watts of microwave,
1500watts of convection power, a
60watt bulb and a
375watt fan

over 15amps -20amp circuit needed

if you inadvertantly replaced a higher current fuse with a 15amp fuse, it will blow every time.
the install guide http://www.whirlpool.com/assets/pdfs/product/ZINSTALL/8206589.pdf reccommends 20amp
not a solution, something to check,

Posted on Oct 14, 2008

hiltonjug
  • 612 Answers

SOURCE: Ewave over the stove microwave fuse blows when I

The light is the only thing that comes on when you open door. You either have a shorted door switch (Micro switch) or a shorted bulb. You have either a shorted bulb or bad socket. From my experience, it's the bulb. Just because it may seem to start to come on when you open the door, it's most likely bad. At least it not expensive.
Please rate solution

Posted on Aug 28, 2009

Testimonial: "Thanks, yes the light comes on for a second then fuse blows. I'll replace it, thanks!"

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KItchenAid microwave KHMS1850S: interlock switches replaced, but fuse keeps blowing


http://kitchen.manualsonline.com/manuals/mfg/kitchenaid/khms1850s.html

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Why my Daewoo microwave oven blows the fuse only when the door gets closed while when it startre with the door opened the bulb is lit and so is the control board until the door is closed then it blows


Hi. The fact that the fuse blows when the door is closed is quite logical. There are safetyswitches preventing the oven to start with an open door. As to the fuse blowing, There are 3 possibilities: the High voltage trafo is defective, the voltage doubler diode or the capacitor are defective. You must be VERY CAREFULL when working on these parts: the voltages are LETHAL.

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My microwave intermittently blows the downstairs sockets


If it is tripping the breaker when you just close the door, I think it might be one of the door switches that the latch activates. There are usually 3 switches behind the latch holes in the microwave. One is a safety monitor switch that is suppose to blow the internal fuse if the microwave is started and the door is not closed properly. It should blow the micro fuse before the house breaker unless you have a weak house breaker. It will do the same thing if start is pressed and it senses a problem with the door. You say the problem is intermittent so I assume you do get it to work at times so I'm guessing most of the microwave is OK. I'm pretty sure you have a door switch problem--- either out of adjustment ---or 1 of them going bad.

Apr 03, 2014 | Neff Microwave Ovens

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I Have a lg microwave oven ( model number - lmvm1945sbq ) that keeps blowing the braker when I try to start it. what is wrong ?


First off all, I would hope the microwave is on its own breaker, rated at 30A, since the microwave has a fuse rated at 20A.

Normally if the high voltage capacitor is shorted, when you hit the "Start" pad to begin cooking, the fuse will blow instantly.

If you have a problem with the monitor interlock switch, the oven will blow the breaker when the door is closed.

But not always, so it may be a shorted high voltage capacitor, but I would first check for a shorted monitor interlock switch, as well as checking the mounts for all three door switches.

See my help file on door switches here.

Here is a link you or someone you know can use to test the high voltage capacitor, but read their safety warnings first:

http://www.gallawa.com/microtech/cap_test.html

The service manual is here, but it does not contain part numbers.

If you need to order parts, contact Encompass here or call them toll-free at 866-779-5835.

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

Oct 26, 2012 | LG LMVM1945 Microwave Oven

1 Answer

Micro blow circuit


You have a faulty interlock switch. This is one of two or three switches in every microwave that are operated by the door. The interlock switch is wired to blow the fuse if you try to run the oven with the door open. The switch may have gotten knocked out of adjustment (say by slamming the oven door) or its contacts stuck closed. If there are no other problems with the oven, a new switch should clear this up.

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Fuse breaks when microwave is switched on


you will probably find that the fuse blowing is due to door switch adjustments, most unit have 3 switches 2 on the door catches and one that is crowbar protection. the 2 door catch switches are normally closed with the door open and the crowbar is the opposite. if they do not change at the correct time when closing nthe door the fuse blows

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LG micro oven it not heat


I am not an expert on Miocrowave ovens, but from past experience I know that they have a number of micro-switches on the door as safety devices. If these switches are faulty, the last safety feature is to short the supply and blow the fuse to stop the microwave from operating in an unsafe condition. Obviously the switches would have to be checked first before jumping to any conclusions and a number of other faults would probably cause the fuse to blow as well.

Jan 11, 2009 | LG LRM1230W Microwave Oven

1 Answer

Please help me


Q - My microwave went dead when I opened the door ( same problem as closed the door ).
A - This often is a stuck or faulty door switch and it has blown the interior microwave fuse.
Q - My microwave is completely dead.
A - House fuse has blown or interior fuse inside the microwave has blown ( usually a part inside the microwave makes this fuse blow ) Sometimes a bad fuse holder inside the microwave cannot hold the fuse tight enough and the fuse will blow as well. 
Q - My microwave blows the fuse inside itself as soon as I push the start button.
A - Usually a shorted high voltage capacitor...see components section.
Q - I burnt something in my microwave and now it is dead...help!
A - The fuse inside the microwave may have blown, but more commonly the flame/oven thermostat has sensed the over cooked food and the flame/oven/cavity thermostat has opened up - Info on that 
Q - My microwave seems to shut off every once in a while, what might be wrong?
A - Make sure you hear the fan is still operating in your microwave. Next is to make sure the air intake grill on your microwave is not plugged up with air borne dust and dirt.
Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food?
A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.





Jan 02, 2009 | Sharp R-242 Microwave Oven

1 Answer

The fuse blows when i plug the microwave in with the door closed


first you gotta detach the button plate ( the thing with all the buttons) using a flathead screwdriver .Keep pushing it is stuburn. It will pop back in when you are done. the fuse is behind that. just take it out and put the new one in.

Nov 16, 2008 | Microwave Ovens

1 Answer

Fuse


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
fuse.

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

http://136.166.4.200/contents/Microwave/LMVM1935xx/LMVM1935xx_Service_Manual.pdf

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

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