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When started to heat,blow fuse. - Magic Chef MCD1311ST Microwave Oven

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What fuse??? the power outlet fuse of the electric circuit?? the microwave fuse inside??? remember microwave oven need a lot of power you should not plug anything els on the same circuit...

if it is the fuse in the microwave, than it could be a sign that the magnetron is about to fail, or it could be a bad/erratic door safety switch that shorts from the oven's vibration... if it's the magnetron it is cheaper to buy a new microwave, if its the safety switch it can be replaced... not to expensive...

Good luck!

Posted on Mar 16, 2011

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Why does my Sharp Carousel convection microwave keep blowing fuses ?


I am wondering which fuse is blowing?
There are at least two fuses fitted internally and in the UK at least another fitted in the plug of the supply lead.

It isn't wise for an unqualified person to replace the internal fuses of a microwave even if it is switched off as there is a capacitor inside that is capable of storing a dangerous amount of energy.

The reasons why a fuse blows is either because there is a poor connection close by that is generating a lot of heat or the the fuse rating is incorrect or of the wrong type (quick-blow instead of slow-blow) or the appliance is consuming more current than it should be.

Microwave ovens have a fairly simple working principle and there aren't many things to go wrong. When things do start to go wrong or components become tired it is usually translated into a loss of efficiency that can be measured by how long it takes to boil a measured quantity of water, for instance.
Periodically timing a measured quantity of water to boiling point is a good way to monitor the performance of a microwave and when efficiency falls significantly take it to the service shop before something destroys itself and causes more damage.

In my limited experience the magnetron could be failing but the internals of a microwave should remain a mystery to the unqualified.
I hope this helps a little.

Jan 15, 2015 | Sharp Microwave Ovens

1 Answer

Works a few seconds then the fuse blows. model#JES13845F


Fuse holders sometimes become weak due to heating. If the fuse is not held very tightly by the holder, the fuse will blow because it gets hot, not because the current exceeds the fuse's rating. If this is the case, replacing the fuse holder would be in order. This is not to be confused with the situation where the fuse blows when the door is opened or closed. In that case it's a door switch sequencing issue, or a bad switch.

May 04, 2014 | Microwave Ovens

1 Answer

I have the model FMAC101D1PS and now it's not heating. I press the minutes to heat, it run but it doesn't heat anyting.


Most likely causes are an open thermal protector or thermal fuse but could also be blown fuse in HV area of microwave (somewhat uncommon in domestic microwaves).
Less likely causes are failure of other parts in the HV area.



If the main power fuse is located in the primary of the high voltage transformer rather then at the line input, the clock and touchpad will work but the fuse will blow upon initiating a cook cycle. Or, if the fuse has already blown there will simply be no heating action once the cook cycle is started. There are other variations depending on whether the cooling fan, oven light, and so forth are located down stream of the fuse.

Some models may have a separate high voltage fuse. If this is blown, there will be no heating but no other symptoms. However, high voltage fuses are somewhat rare on domestic ovens.

A number of failures can result in the fuse NOT blowing but still no heat:

  • Bad connections - these may be almost anywhere in the microwave generator or the primary circuit of the HV transformer. A common location is at the crimp connections to the magnetron filament as they are high current and can overheat and result in no or intermittent contact. See the section: See the section: Testing the magnetron (see repair manual link below).
  • Open thermal protector - usually located on magnetron case. Test for continuity. It should read as a dead short - near zero ohms. See the section: Testing thermal protectors and thermal fuses (see repair manual link below).
  • Open thermal fuse - some ovens have one of these in the primary circuit. It may be in either connection to the HV transformer or elsewhere. Test for continuity. It should read as a dead short - near zero ohms.
  • For the various HV parts and how to test them follow this link: Microwave Repair Manual link.

A shorted HV diode, magnetron, or certain parts of the HV wiring would probably result in a loud hum from the HV transformer but will likely not blow the main fuse. (However, the HV fuse - not present on most domestic ovens - might blow.)

Depending on design, a number of other component failures could result in no heat as well including a defective relay or triac, interlock switch(s), and controller.

Oct 21, 2010 | Frigidaire Microwave Ovens

1 Answer

MY SAMSUNG MW6574W OVEN FUSE BLOWS AFTER 4-5 MINS OF REHEATING-NO SMELL OF BURNING -EVERYTHING ELSE WORKS FINE- NO LOOSE WIRING-ALL BULBS WORK FINE TOO- THE FOOD HEATS UP FINE EXCEPT THAT THE FUSE BLO


the insulation of the wiring has detiorated and with temperatue rising it further deteriorates. thus increasing the current consumption and blowing the fuse

May 21, 2009 | Samsung MW6575G/MW6574W Microwave Oven

2 Answers

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

Microwave runs but does not blow heat


HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))....

Oct 03, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Fuse


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,

drcool

Aug 02, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave stopped heating after being cleaned (could be co-incidence). Besides not heating appeared to run properly. Let sit for a day hoping something was wet and would dry, tried heating glass of water...


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.
If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

But you might replace the fuse and do another quick heating test to see if it blows again. If so, you'll need to do some checks.

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

http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/xformer.html
We're happy to help and we appreciate your thoughtful rating of our answer.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

May 12, 2008 | Microwave Ovens

2 Answers

Microwave troubleshooting...


My GE spacesaver microwave all of a sudden stopped heating up things. The lights, fan, turntable, etc. work, but nothing is heating up. Any suggestions?

Oct 23, 2007 | Whirlpool GH8155XM Microwave Oven

2 Answers

Fuse keep blowing up


You have a short in the system. removeing the fuse was not a good thing to do. The fuse in a microwave helps keep the system from an overload which can and I have seen this blow-up. The micro pump inside might have a dead short it,

Aug 30, 2006 | Whirlpool MH7130XE Microwave Oven

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